From: Louis Dionne <ldionne@apple.com>
Date: Wed, 22 Jul 2020 19:24:16 +0000 (-0400)
Subject: [libc++] Workaround broken support for C++17 in GCC 5
X-Git-Tag: llvmorg-13-init~17098
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e9748a7255df1f45175a391d90803e84f62b3c12;p=platform%2Fupstream%2Fllvm.git

[libc++] Workaround broken support for C++17 in GCC 5
---

diff --git a/libcxx/include/variant b/libcxx/include/variant
index 0355723..5ea2cbd 100644
--- a/libcxx/include/variant
+++ b/libcxx/include/variant
@@ -227,7 +227,10 @@ public:
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER > 14
+// 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)
 
 _LIBCPP_NORETURN
 inline _LIBCPP_INLINE_VISIBILITY