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Brad King
b0996a3fa2
A common use case of `target_compile_features` is simply to specify that the compiler should be run in a mode that is aware of e.g. C++11. Some projects simply specify a particular C++11-only feature to request this. Provide a first-class way to do this by naming features after the corresponding language standard. Record them as always available in the corresponding standard level so that requesting them always ensures that standard (or higher) is used.
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CMAKE_C_KNOWN_FEATURES
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----------------------
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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:
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``c_std_90``
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Compiler mode is aware of C 90.
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``c_std_99``
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Compiler mode is aware of C 99.
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``c_std_11``
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Compiler mode is aware of C 11.
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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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