[libcxx] Fix detection of __is_final.
Summary: Currently we only enable the use of __is_final(...) with Clang. GCC also provides __is_final(...) since 4.7 in all standard modes. This patch creates the macro _LIBCPP_HAS_IS_FINAL to note the availability of `__is_final`.
Reviewers: danalbert, mclow.lists
Reviewed By: mclow.lists
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D8795
llvm-svn: 239664
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: ee187e247bc2c7b97eb345e1de7f5ccf151e24e5
diff --git a/include/memory b/include/memory
index dc5902d..03897b1 100644
--- a/include/memory
+++ b/include/memory
@@ -1982,14 +1982,9 @@
template <class _T1, class _T2, bool = is_same<typename remove_cv<_T1>::type,
typename remove_cv<_T2>::type>::value,
bool = is_empty<_T1>::value
-#if __has_feature(is_final)
- && !__is_final(_T1)
-#endif
- ,
+ && !__libcpp_is_final<_T1>::value,
bool = is_empty<_T2>::value
-#if __has_feature(is_final)
- && !__is_final(_T2)
-#endif
+ && !__libcpp_is_final<_T2>::value
>
struct __libcpp_compressed_pair_switch;