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Diffstat (limited to 'share/cmake-3.10/Modules/CheckCXXSourceCompiles.cmake')
| -rw-r--r-- | share/cmake-3.10/Modules/CheckCXXSourceCompiles.cmake | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/share/cmake-3.10/Modules/CheckCXXSourceCompiles.cmake b/share/cmake-3.10/Modules/CheckCXXSourceCompiles.cmake new file mode 100644 index 0000000..4634a7b --- /dev/null +++ b/share/cmake-3.10/Modules/CheckCXXSourceCompiles.cmake @@ -0,0 +1,133 @@ +# Distributed under the OSI-approved BSD 3-Clause License. See accompanying +# file Copyright.txt or https://cmake.org/licensing for details. + +#[=======================================================================[.rst: +CheckCXXSourceCompiles +---------------------- + +Check if given C++ source compiles and links into an executable. + +.. command:: check_cxx_source_compiles + + :: + + check_cxx_source_compiles(code resultVar [FAIL_REGEX regex1 [regex2...]]) + + Check that the source supplied in ``code`` can be compiled as a C++ source + file and linked as an executable (so it must contain at least a ``main()`` + function). The result will be stored in the internal cache variable specified + by ``resultVar``, with a boolean true value for success and boolean false for + failure. If ``FAIL_REGEX`` is provided, then failure is determined by + checking if anything in the output matches any of the specified regular + expressions. + + The underlying check is performed by the :command:`try_compile` command. The + compile and link commands can be influenced by setting any of the following + variables prior to calling ``check_cxx_source_compiles()``: + + ``CMAKE_REQUIRED_FLAGS`` + Additional flags to pass to the compiler. Note that the contents of + :variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated + configuration-specific variable are automatically added to the compiler + command before the contents of ``CMAKE_REQUIRED_FLAGS``. + + ``CMAKE_REQUIRED_DEFINITIONS`` + A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form + ``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by + ``resultVar`` will also be added automatically. + + ``CMAKE_REQUIRED_INCLUDES`` + A :ref:`;-list <CMake Language Lists>` of header search paths to pass to + the compiler. These will be the only header search paths used by + ``try_compile()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES` + directory property will be ignored. + + ``CMAKE_REQUIRED_LIBRARIES`` + A :ref:`;-list <CMake Language Lists>` of libraries to add to the link + command. These can be the name of system libraries or they can be + :ref:`Imported Targets <Imported Targets>` (see :command:`try_compile` for + further details). + + ``CMAKE_REQUIRED_QUIET`` + If this variable evaluates to a boolean true value, all status messages + associated with the check will be suppressed. + + The check is only performed once, with the result cached in the variable + named by ``resultVar``. Every subsequent CMake run will re-use this cached + value rather than performing the check again, even if the ``code`` changes. + In order to force the check to be re-evaluated, the variable named by + ``resultVar`` must be manually removed from the cache. + +#]=======================================================================] + +macro(CHECK_CXX_SOURCE_COMPILES SOURCE VAR) + if(NOT DEFINED "${VAR}") + set(_FAIL_REGEX) + set(_key) + foreach(arg ${ARGN}) + if("${arg}" MATCHES "^(FAIL_REGEX)$") + set(_key "${arg}") + elseif(_key) + list(APPEND _${_key} "${arg}") + else() + message(FATAL_ERROR "Unknown argument:\n ${arg}\n") + endif() + endforeach() + + set(MACRO_CHECK_FUNCTION_DEFINITIONS + "-D${VAR} ${CMAKE_REQUIRED_FLAGS}") + if(CMAKE_REQUIRED_LIBRARIES) + set(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES + LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) + else() + set(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES) + endif() + if(CMAKE_REQUIRED_INCLUDES) + set(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES + "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") + else() + set(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES) + endif() + file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx" + "${SOURCE}\n") + + if(NOT CMAKE_REQUIRED_QUIET) + message(STATUS "Performing Test ${VAR}") + endif() + try_compile(${VAR} + ${CMAKE_BINARY_DIR} + ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx + COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} + ${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES} + CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS} + "${CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES}" + OUTPUT_VARIABLE OUTPUT) + + foreach(_regex ${_FAIL_REGEX}) + if("${OUTPUT}" MATCHES "${_regex}") + set(${VAR} 0) + endif() + endforeach() + + if(${VAR}) + set(${VAR} 1 CACHE INTERNAL "Test ${VAR}") + if(NOT CMAKE_REQUIRED_QUIET) + message(STATUS "Performing Test ${VAR} - Success") + endif() + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log + "Performing C++ SOURCE FILE Test ${VAR} succeeded with the following output:\n" + "${OUTPUT}\n" + "Source file was:\n${SOURCE}\n") + else() + if(NOT CMAKE_REQUIRED_QUIET) + message(STATUS "Performing Test ${VAR} - Failed") + endif() + set(${VAR} "" CACHE INTERNAL "Test ${VAR}") + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log + "Performing C++ SOURCE FILE Test ${VAR} failed with the following output:\n" + "${OUTPUT}\n" + "Source file was:\n${SOURCE}\n") + endif() + endif() +endmacro() + |