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CMAKE_C_KNOWN_FEATURES
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----------------------
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.. versionadded:: 3.1
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List of C features known to this version of CMake.
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The features listed in this global property may be known to be available to the
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C compiler. If the feature is available with the C compiler, it will
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be listed in the :variable:`CMAKE_C_COMPILE_FEATURES` variable.
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The features listed here may be used with the :command:`target_compile_features`
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command. See the :manual:`cmake-compile-features(7)` manual for information on
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compile features and a list of supported compilers.
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The features known to this version of CMake are listed below.
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High level meta features indicating C standard support
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. versionadded:: 3.8
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``c_std_90``
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Compiler mode is at least C 90.
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``c_std_99``
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Compiler mode is at least C 99.
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``c_std_11``
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Compiler mode is at least C 11.
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``c_std_17``
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.. versionadded:: 3.21
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Compiler mode is at least C 17.
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``c_std_23``
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.. versionadded:: 3.21
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Compiler mode is at least C 23.
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Low level individual compile features
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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``c_function_prototypes``
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Function prototypes, as defined in ``ISO/IEC 9899:1990``.
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``c_restrict``
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``restrict`` keyword, as defined in ``ISO/IEC 9899:1999``.
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``c_static_assert``
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Static assert, as defined in ``ISO/IEC 9899:2011``.
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``c_variadic_macros``
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Variadic macros, as defined in ``ISO/IEC 9899:1999``.
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