Fix detection for [[fallthrough]] with GCC

llvm-svn: 302285

diff --git a/libcxx/include/__config b/libcxx/include/__config
index a9f9d0f..2a29074 100644 (file)
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -1089,7 +1089,7 @@ _LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container(
 # define _LIBCPP_DIAGNOSE_ERROR(...)
 #endif
 
-#if __has_attribute(fallthough) || defined(_LIBCPP_COMPILER_GCC)
+#if __has_attribute(fallthough) || _GNUC_VER >= 700
 // Use a function like macro to imply that it must be followed by a semicolon
 #define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__))
 #else