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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:
CheckCompilerFlag
---------------------
.. versionadded:: 3.19
Check whether the compiler supports a given flag.
.. command:: check_compiler_flag
.. code-block:: cmake
check_compiler_flag(<lang> <flag> <resultVar>)
Check that the ``<flag>`` is accepted by the compiler without a diagnostic.
Stores the result in an internal cache entry named ``<resultVar>``.
A positive result from this check indicates only that the compiler did not
issue a diagnostic message when given the flag. Whether the flag has any
effect or even a specific one is beyond the scope of this module.
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.
The compile and link commands can be influenced by setting any of the
following variables prior to calling ``check_compiler_flag()``
.. include:: /module/CMAKE_REQUIRED_FLAGS.txt
.. include:: /module/CMAKE_REQUIRED_DEFINITIONS.txt
.. include:: /module/CMAKE_REQUIRED_INCLUDES.txt
.. include:: /module/CMAKE_REQUIRED_LINK_OPTIONS.txt
.. include:: /module/CMAKE_REQUIRED_LIBRARIES.txt
.. include:: /module/CMAKE_REQUIRED_QUIET.txt
#]=======================================================================]
include_guard(GLOBAL)
include(Internal/CheckCompilerFlag)
function(CHECK_COMPILER_FLAG _lang _flag _var)
cmake_check_compiler_flag(${_lang} "${_flag}" ${_var})
endfunction()
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