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authorStephen Kelly <steveire@gmail.com>2015-01-11 15:20:03 (GMT)
committerStephen Kelly <steveire@gmail.com>2015-01-15 21:13:22 (GMT)
commit222ec86f7d9ae838d2e460b89985c797c7c90373 (patch)
treefd036d94a0691bcc4a4e4a51e9c720b4f9dcfee9 /Modules/Compiler
parent6e909035af73d3ee0ca3e5adef39b4541f0c8be9 (diff)
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Features: Test an old value of __STDC_VERSION__ for GNU < 4.7 compatibility.
Diffstat (limited to 'Modules/Compiler')
-rw-r--r--Modules/Compiler/GNU-C-FeatureTests.cmake7
1 files changed, 6 insertions, 1 deletions
diff --git a/Modules/Compiler/GNU-C-FeatureTests.cmake b/Modules/Compiler/GNU-C-FeatureTests.cmake
index dfaeebf..ddac0e8 100644
--- a/Modules/Compiler/GNU-C-FeatureTests.cmake
+++ b/Modules/Compiler/GNU-C-FeatureTests.cmake
@@ -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")