[libc++] Make sure we only consider _GNUC_VER_NEW when the compiler is GCC
When the compiler is Clang, _GNUC_VER_NEW is 0, which messes up the logic.
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 9798b2311f7f5b06e0a377613b3e90ed34d5d9c1
diff --git a/include/variant b/include/variant
index 5ea2cbd..33d5dc7 100644
--- a/include/variant
+++ b/include/variant
@@ -230,7 +230,7 @@
// TODO: GCC 5 lies about its support for C++17 (it says it supports it but it
// really doesn't). That breaks variant, which uses some C++17 features.
// Remove this once we drop support for GCC 5.
-#if _LIBCPP_STD_VER > 14 && !(_GNUC_VER_NEW < 6000)
+#if _LIBCPP_STD_VER > 14 && !(defined(_LIBCPP_COMPILER_GCC) && _GNUC_VER_NEW < 6000)
_LIBCPP_NORETURN
inline _LIBCPP_INLINE_VISIBILITY