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-rw-r--r--Modules/Compiler/Clang-C-FeatureTests.cmake4
1 files changed, 2 insertions, 2 deletions
diff --git a/Modules/Compiler/Clang-C-FeatureTests.cmake b/Modules/Compiler/Clang-C-FeatureTests.cmake
index 4a72e87..2d8673d 100644
--- a/Modules/Compiler/Clang-C-FeatureTests.cmake
+++ b/Modules/Compiler/Clang-C-FeatureTests.cmake
@@ -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}")