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WCDH: Make the header -Wundef safe for the C language.

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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.
This commit is contained in:
Stephen Kelly
2014-11-24 21:47:48 +01:00
parent 598a316154
commit d0af0faefb
4 changed files with 18 additions and 4 deletions
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Modules/Compiler/Clang-C-FeatureTests.cmake
+2 -2
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@@ -1,9 +1,9 @@
set(_cmake_oldestSupported "((__clang_major__ * 100) + __clang_minor__) >= 304")
set(Clang_C11 "${_cmake_oldestSupported} && __STDC_VERSION__ >= 201112L")
set(Clang_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
set(_cmake_feature_test_c_static_assert "${Clang_C11}")
set(Clang_C99 "${_cmake_oldestSupported} && __STDC_VERSION__ >= 199901L")
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 "${Clang_C99}")
Modules/Compiler/GNU-C-FeatureTests.cmake
+2 -2
View File
@@ -1,10 +1,10 @@
set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 407")
set(GNU46_C11 "${_cmake_oldestSupported} && __STDC_VERSION__ >= 201112L")
set(GNU46_C11 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L")
set(_cmake_feature_test_c_static_assert "${GNU46_C11}")
# Since 4.4 at least:
set(GNU44_C99 "${_cmake_oldestSupported} && __STDC_VERSION__ >= 199901L")
set(GNU44_C99 "${_cmake_oldestSupported} && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
set(_cmake_feature_test_c_restrict "${GNU44_C99}")
set(_cmake_feature_test_c_variadic_macros "${GNU44_C99}")