From 50c736c9ab7c38378aa61c830c6242d9b32fb736 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Fri, 13 Dec 2013 09:53:06 +0000
Subject: [PATCH] GCC-4.7x at least on Mingw does not have a conforming
 <atomic> header - at least not that you can link to.

---
 include/boost/config/stdlib/libstdcpp3.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/config/stdlib/libstdcpp3.hpp b/include/boost/config/stdlib/libstdcpp3.hpp
index 496e8d1b..d1322027 100644
--- a/include/boost/config/stdlib/libstdcpp3.hpp
+++ b/include/boost/config/stdlib/libstdcpp3.hpp
@@ -155,6 +155,11 @@
 // so 4.7.0 is the first truely conforming one.
 #  define BOOST_NO_CXX11_HDR_CHRONO
 #  define BOOST_NO_CXX11_ALLOCATOR
+#endif
+//  C++0x features in GCC 4.7.0 and later
+//
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8) || !defined(__GXX_EXPERIMENTAL_CXX0X__)
+// Note that although <atomic> existed prior to gcc 4.8 it was largely unimplemented for many types:
 #  define BOOST_NO_CXX11_HDR_ATOMIC
 #endif
 //  C++0x headers not yet (fully!) implemented