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