CMake/Help/prop_gbl/CMAKE_C_KNOWN_FEATURES.rst

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CMAKE_C_KNOWN_FEATURES
----------------------
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.
The features known to this version of CMake are:
``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``.