From aa0e236289a6643641c6d268deb69e0013d5112a Mon Sep 17 00:00:00 2001
From: Marshall Clow <mclow.lists@gmail.com>
Date: Wed, 22 Nov 2017 19:49:03 +0000
Subject: Implement p0137r1 - std::launder. Reviewed as
 https://reviews.llvm.org/D40144

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318864 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/__config | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include/__config')

diff --git a/include/__config b/include/__config
index 561eb36ac..70a34e1c0 100644
--- a/include/__config
+++ b/include/__config
@@ -456,6 +456,10 @@ namespace std {
 #define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
 #endif 
 
+#if __has_builtin(__builtin_launder)
+#define	_LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER
+#endif
+
 #elif defined(_LIBCPP_COMPILER_GCC)
 
 #define _ALIGNAS(x) __attribute__((__aligned__(x)))
@@ -538,6 +542,10 @@ namespace std {
 #define _LIBCPP_HAS_NO_ASAN
 #endif
 
+#if _GNUC_VER >= 700
+#define	_LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER
+#endif
+
 #elif defined(_LIBCPP_COMPILER_MSVC)
 
 #define _LIBCPP_TOSTRING2(x) #x
-- 
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