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Features: Test an old value of __STDC_VERSION__ for GNU < 4.7 compatibility.

This commit is contained in:
Stephen Kelly 2015-01-11 16:20:03 +01:00
parent 6e909035af
commit 222ec86f7d
1 changed files with 6 additions and 1 deletions
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7
Modules/Compiler/GNU-C-FeatureTests.cmake
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@ -1,7 +1,12 @@
set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 407")
set(GNU46_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
# GNU 4.7 correctly sets __STDC_VERSION__ to 201112L, but GNU 4.6 sets it
# to 201000L. As the former is strictly greater than the latter, test only
# for the latter. If in the future CMake learns about a C feature which was
# introduced with GNU 4.7, that should test for the correct version, similar
# to the distinction between __cplusplus and __GXX_EXPERIMENTAL_CXX0X__ tests.
set(GNU46_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201000L")
set(_cmake_feature_test_c_static_assert "${GNU46_C11}")
# Since 4.4 at least:
set(GNU44_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")