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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.
18 lines
981 B
CMake
18 lines
981 B
CMake
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set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404")
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# GNU 4.7 correctly sets __STDC_VERSION__ to 201112L, but GNU 4.6 sets it
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# to 201000L. As the former is strictly greater than the latter, test only
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# for the latter. If in the future CMake learns about a C feature which was
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# introduced with GNU 4.7, that should test for the correct version, similar
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# to the distinction between __cplusplus and __GXX_EXPERIMENTAL_CXX0X__ tests.
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set(GNU46_C11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 406 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201000L")
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set(_cmake_feature_test_c_static_assert "${GNU46_C11}")
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# Since 4.4 at least:
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set(GNU44_C99 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
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set(_cmake_feature_test_c_restrict "${GNU44_C99}")
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set(_cmake_feature_test_c_variadic_macros "${GNU44_C99}")
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set(GNU_C90 "${_cmake_oldestSupported}")
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set(_cmake_feature_test_c_function_prototypes "${GNU_C90}")
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