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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.
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()
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