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54 lines
1.8 KiB
CMake
54 lines
1.8 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CheckCompilerFlag
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---------------------
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.. versionadded:: 3.19
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Check whether the compiler supports a given flag.
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.. command:: check_compiler_flag
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.. code-block:: cmake
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check_compiler_flag(<lang> <flag> <resultVar>)
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Check that the ``<flag>`` is accepted by the compiler without a diagnostic.
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Stores the result in an internal cache entry named ``<resultVar>``.
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A positive result from this check indicates only that the compiler did not
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issue a diagnostic message when given the flag. Whether the flag has any
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effect or even a specific one is beyond the scope of this module.
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The check is only performed once, with the result cached in the variable named
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by ``<resultVar>``. Every subsequent CMake run will re-use this cached value
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rather than performing the check again, even if the ``<code>`` changes. In
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order to force the check to be re-evaluated, the variable named by
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``<resultVar>`` must be manually removed from the cache.
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The compile and link commands can be influenced by setting any of the
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following variables prior to calling ``check_compiler_flag()``
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.. include:: /module/CMAKE_REQUIRED_FLAGS.txt
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.. include:: /module/CMAKE_REQUIRED_DEFINITIONS.txt
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.. include:: /module/CMAKE_REQUIRED_INCLUDES.txt
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.. include:: /module/CMAKE_REQUIRED_LINK_OPTIONS.txt
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.. include:: /module/CMAKE_REQUIRED_LIBRARIES.txt
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.. include:: /module/CMAKE_REQUIRED_QUIET.txt
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#]=======================================================================]
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include_guard(GLOBAL)
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include(Internal/CheckCompilerFlag)
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function(CHECK_COMPILER_FLAG _lang _flag _var)
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cmake_check_compiler_flag(${_lang} "${_flag}" ${_var})
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endfunction()
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