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46 lines
1.7 KiB
46 lines
1.7 KiB
# 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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CheckLinkerFlag
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---------------
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.. versionadded:: 3.18
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Check whether the compiler supports a given link flag.
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.. command:: check_linker_flag
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.. code-block:: cmake
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check_linker_flag(<lang> <flag> <var>)
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Check that the link ``<flag>`` is accepted by the ``<lang>`` compiler without
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a diagnostic. Stores the result in an internal cache entry named ``<var>``.
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This command temporarily sets the ``CMAKE_REQUIRED_LINK_OPTIONS`` variable
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and calls the :command:`check_source_compiles` command from the
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:module:`CheckSourceCompiles` module. See that module's documentation
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for a listing of variables that can otherwise modify the build.
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The underlying implementation relies on the :prop_tgt:`LINK_OPTIONS` property
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to check the specified flag. The ``LINKER:`` prefix, as described in the
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:command:`target_link_options` command, can be used as well.
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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 link 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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.. note::
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Since the :command:`try_compile` command forwards flags from variables
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like :variable:`CMAKE_<LANG>_FLAGS`, unknown flags in such variables may
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cause a false negative for this check.
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#]=======================================================================]
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include_guard(GLOBAL)
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include(Internal/CheckLinkerFlag)
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function(CHECK_LINKER_FLAG _lang _flag _var)
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cmake_check_linker_flag(${_lang} "${_flag}" ${_var})
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endfunction()
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