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fb3487a997
This bug caused c_function_prototypes to not be recorded at configure time when compiling with -std=gnu99 or similar. In the case of feature recording, that was not a problem, because the logic in CMakeDetermineCompileFeatures.cmake currently assumes that a feature present for an earlier standard is present for a later standard. However, the detection strings are also used in WriteCompilerDetectionHeader, so the feature macro has been defined to '0' when using a later language dialect. Fix that by not checking the existence of the __STDC_VERSION__ macro at all when detecting C90 features.
12 lines
595 B
CMake
12 lines
595 B
CMake
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set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 400")
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set(AppleClang_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
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set(_cmake_feature_test_c_static_assert "${AppleClang_C11}")
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set(AppleClang_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
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set(_cmake_feature_test_c_restrict "${AppleClang_C99}")
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set(_cmake_feature_test_c_variadic_macros "${AppleClang_C99}")
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set(AppleClang_C90 "${_cmake_oldestSupported}")
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set(_cmake_feature_test_c_function_prototypes "${AppleClang_C90}")
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