mirror of
https://github.com/Kitware/CMake.git
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8e4899fd6c
Use the infrastructure added by commit f92ccbc306
(CompileFeatures: memoize C compilers with full language level support)
to avoid using a `try_compile` to check for C 90/99/11 feature support when the running compiler is known to have a fixed set of feature support.
30 lines
1.1 KiB
CMake
30 lines
1.1 KiB
CMake
# MSVC has no specific options to set C language standards, but set them as
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# empty strings anyways so the feature test infrastructure can at least check
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# to see if they are defined.
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set(CMAKE_C90_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C90_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C99_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C99_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_C11_STANDARD_COMPILE_OPTION "")
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set(CMAKE_C11_EXTENSION_COMPILE_OPTION "")
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# There is no meaningful default for this
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set(CMAKE_C_STANDARD_DEFAULT "")
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# There are no C compiler modes so we hard-code the known compiler supported
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# features. Override the default macro for this special case. Pretend that
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# all language standards are available so that at least compilation
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# can be attempted.
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macro(cmake_record_c_compile_features)
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list(APPEND CMAKE_C_COMPILE_FEATURES
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c_std_90
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c_std_99
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c_std_11
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c_function_prototypes
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c_variadic_macros
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)
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list(APPEND CMAKE_C90_COMPILE_FEATURES c_std_90 c_function_prototypes)
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list(APPEND CMAKE_C99_COMPILE_FEATURES c_std_99 c_variadic_macros)
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list(APPEND CMAKE_C11_COMPILE_FEATURES c_std_11)
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endmacro()
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