From 3b77df96facc38ab1122e4e29ac7588c79872f6c Mon Sep 17 00:00:00 2001
From: James Donald <jdonald@leapmotion.com>
Date: Wed, 26 Oct 2016 15:28:04 -0700
Subject: [PATCH] Fix Xcode 8 deprecation warning on memory barrier

---
 .../autoboost/autoboost/asio/detail/macos_fenced_block.hpp  | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/contrib/autoboost/autoboost/asio/detail/macos_fenced_block.hpp b/contrib/autoboost/autoboost/asio/detail/macos_fenced_block.hpp
index 8cc35d7fe..94b2b3aa1 100644
--- a/contrib/autoboost/autoboost/asio/detail/macos_fenced_block.hpp
+++ b/contrib/autoboost/autoboost/asio/detail/macos_fenced_block.hpp
@@ -19,7 +19,7 @@
 
 #if defined(__MACH__) && defined(__APPLE__)
 
-#include <libkern/OSAtomic.h>
+#include <atomic>
 
 #include <autoboost/asio/detail/push_options.hpp>
 
@@ -42,13 +42,13 @@ class macos_fenced_block
   // Constructor for a full fenced block.
   explicit macos_fenced_block(full_t)
   {
-    OSMemoryBarrier();
+    std::atomic_thread_fence(std::memory_order_seq_cst);
   }
 
   // Destructor.
   ~macos_fenced_block()
   {
-    OSMemoryBarrier();
+    std::atomic_thread_fence(std::memory_order_seq_cst);
   }
 };