Fixing the MSan/compiler-rt build
Patch by Evgieniy Stepanov, review by İsmail Dönmez.
llvm-svn: 181740
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 6b8475b..d5c3985 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -278,9 +278,19 @@
#define _LIBCPP_HAS_NO_CONSTEXPR
#endif
-#if ( defined(__FreeBSD__) || defined(__linux__) ) && (__ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L)
+#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
+#if defined(__FreeBSD__)
#define _LIBCPP_HAS_QUICK_EXIT
#define _LIBCPP_HAS_C11_FEATURES
+#elif defined(__linux__)
+#include <features.h>
+#if __GLIBC_PREREQ(2, 15)
+#define _LIBCPP_HAS_QUICK_EXIT
+#endif
+#if __GLIBC_PREREQ(2, 17)
+#define _LIBCPP_HAS_C11_FEATURES
+#endif
+#endif
#endif
#if (__has_feature(cxx_noexcept))