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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CheckCXXSymbolExists
+--------------------
+
+Check if a symbol exists as a function, variable, or macro in ``C++``.
+
+.. command:: check_cxx_symbol_exists
+
+  .. code-block:: cmake
+
+    check_cxx_symbol_exists(<symbol> <files> <variable>)
+
+  Check that the ``<symbol>`` is available after including given header
+  ``<files>`` and store the result in a ``<variable>``.  Specify the list of
+  files in one argument as a semicolon-separated list.
+  ``check_cxx_symbol_exists()`` can be used to check for symbols as seen by
+  the C++ compiler, as opposed to :command:`check_symbol_exists`, which always
+  uses the ``C`` compiler.
+
+  If the header files define the symbol as a macro it is considered
+  available and assumed to work.  If the header files declare the symbol
+  as a function or variable then the symbol must also be available for
+  linking.  If the symbol is a type, enum value, or C++ template it will
+  not be recognized: consider using the :module:`CheckTypeSize`
+  or :module:`CheckCXXSourceCompiles` module instead.
+
+.. note::
+
+  This command is unreliable when ``<symbol>`` is (potentially) an overloaded
+  function. Since there is no reliable way to predict whether a given function
+  in the system environment may be defined as an overloaded function or may be
+  an overloaded function on other systems or will become so in the future, it
+  is generally advised to use the :module:`CheckCXXSourceCompiles` module for
+  checking any function symbol (unless somehow you surely know the checked
+  function is not overloaded on other systems or will not be so in the
+  future).
+
+The following variables may be set before calling this macro to modify
+the way the check is run:
+
+``CMAKE_REQUIRED_FLAGS``
+  string of compile command line flags.
+``CMAKE_REQUIRED_DEFINITIONS``
+  a :ref:`;-list <CMake Language Lists>` of macros to define (-DFOO=bar).
+``CMAKE_REQUIRED_INCLUDES``
+  a :ref:`;-list <CMake Language Lists>` of header search paths to pass to
+  the compiler.
+``CMAKE_REQUIRED_LINK_OPTIONS``
+  a :ref:`;-list <CMake Language Lists>` of options to add to the link command.
+``CMAKE_REQUIRED_LIBRARIES``
+  a :ref:`;-list <CMake Language Lists>` of libraries to add to the link
+  command. See policy :policy:`CMP0075`.
+``CMAKE_REQUIRED_QUIET``
+  execute quietly without messages.
+
+For example:
+
+.. code-block:: cmake
+
+  include(CheckCXXSymbolExists)
+
+  # Check for macro SEEK_SET
+  check_cxx_symbol_exists(SEEK_SET "cstdio" HAVE_SEEK_SET)
+  # Check for function std::fopen
+  check_cxx_symbol_exists(std::fopen "cstdio" HAVE_STD_FOPEN)
+#]=======================================================================]
+
+include_guard(GLOBAL)
+include(CheckSymbolExists)
+
+macro(CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
+  __CHECK_SYMBOL_EXISTS_IMPL("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
+endmacro()