From 831c1129547c973c59ccb957ed9fe0cf74102477 Mon Sep 17 00:00:00 2001
From: Eric Fiselier <eric@efcs.ca>
Date: Tue, 15 Dec 2015 00:32:21 +0000
Subject: Fix various GCC mis-configurations for newer versions.

This patch goes through and enables C++11 and C++14 features for newer GCC's.
The main changes are:

1. Turn on variable templates. (Uses __cpp_variable_templates)
2. Assert atomic<Tp> is trivially copyable (Uses _GNUC_VER >= 501).
3. Turn on trailing return support for GCC. (Uses _GNUC_VER >= 404)
4. XFAIL void_t test for GCC 5.1 and 5.2. Fixed in GCC 6.

llvm-svn: 255585
---
 libcxx/include/atomic | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'libcxx/include/atomic')

diff --git a/libcxx/include/atomic b/libcxx/include/atomic
index b5d5a27b041..abec2a0b565 100644
--- a/libcxx/include/atomic
+++ b/libcxx/include/atomic
@@ -552,6 +552,12 @@ typedef enum memory_order
 namespace __gcc_atomic {
 template <typename _Tp>
 struct __gcc_atomic_t {
+
+#if _GNUC_VER >= 501
+    static_assert(is_trivially_copyable<_Tp>::value,
+      "std::atomic<Tp> requires that 'Tp' be a trivially copyable type");
+#endif
+
   _LIBCPP_INLINE_VISIBILITY
 #ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
     __gcc_atomic_t() _NOEXCEPT = default;
-- 
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