CMake/Modules/Compiler/Clang-C-FeatureTests.cmake


set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 304")

set(Clang_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
set(_cmake_feature_test_c_static_assert "${Clang_C11}")
set(Clang_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
set(_cmake_feature_test_c_restrict "${Clang_C99}")
set(_cmake_feature_test_c_variadic_macros "${Clang_C99}")

set(Clang_C90 "${_cmake_oldestSupported}")
set(_cmake_feature_test_c_function_prototypes "${Clang_C90}")
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake. 2014-05-06 13:59:12 +04:00
			`set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 304")`

WCDH: Make the header -Wundef safe for the C language. The __STDC_VERSION__ macro may be defined or not depending on the implementation dialect of C. Test that it is defined before testing its value. The CXX tests do not need such a change because they define __cplusplus in all dialects. 2014-11-24 23:47:48 +03:00			`set(Clang_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")`
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake. 2014-05-06 13:59:12 +04:00			`set(_cmake_feature_test_c_static_assert "${Clang_C11}")`
WCDH: Make the header -Wundef safe for the C language. The __STDC_VERSION__ macro may be defined or not depending on the implementation dialect of C. Test that it is defined before testing its value. The CXX tests do not need such a change because they define __cplusplus in all dialects. 2014-11-24 23:47:48 +03:00			`set(Clang_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")`
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake. 2014-05-06 13:59:12 +04:00			`set(_cmake_feature_test_c_restrict "${Clang_C99}")`
			`set(_cmake_feature_test_c_variadic_macros "${Clang_C99}")`

Features: Fix C90 feature detection. 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. 2015-02-03 23:47:45 +03:00			`set(Clang_C90 "${_cmake_oldestSupported}")`
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake. 2014-05-06 13:59:12 +04:00			`set(_cmake_feature_test_c_function_prototypes "${Clang_C90}")`