set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 304") | |
# GNU 4.7 correctly sets __STDC_VERSION__ to 201112L, but GNU 4.6 sets it | |
# to 201000L. As the former is strictly greater than the latter, test only | |
# for the latter. If in the future CMake learns about a C feature which was | |
# introduced with GNU 4.7, that should test for the correct version, similar | |
# to the distinction between __cplusplus and __GXX_EXPERIMENTAL_CXX0X__ tests. | |
set(GNU46_C11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 406 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201000L") | |
set(_cmake_feature_test_c_static_assert "${GNU46_C11}") | |
# Since 3.4 at least: | |
set(GNU34_C99 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 304 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L") | |
set(_cmake_feature_test_c_restrict "${GNU34_C99}") | |
set(_cmake_feature_test_c_variadic_macros "${GNU34_C99}") | |
set(GNU_C90 "${_cmake_oldestSupported}") | |
set(_cmake_feature_test_c_function_prototypes "${GNU_C90}") |