From fe5e07b521e49f6cca712c801e025fed13c23979 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Wed, 14 Jun 2017 19:32:59 +0100
Subject: [PATCH] gcc.hpp: Mingw has broken thread_local support. See 
 https://sourceforge.net/p/mingw-w64/bugs/527/

---
 include/boost/config/compiler/gcc.hpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/boost/config/compiler/gcc.hpp b/include/boost/config/compiler/gcc.hpp
index da05a63e..d1cfed7a 100644
--- a/include/boost/config/compiler/gcc.hpp
+++ b/include/boost/config/compiler/gcc.hpp
@@ -303,6 +303,13 @@
 #  define BOOST_FALLTHROUGH __attribute__((fallthrough))
 #endif
 
+#ifdef __MINGW32__
+// Currently (June 2017) thread_local is broken on mingw for all current compiler releases, see
+// https://sourceforge.net/p/mingw-w64/bugs/527/
+// Not setting this causes program termination on thread exit.
+#define BOOST_NO_CXX11_THREAD_LOCAL
+#endif
+
 //
 // Unused attribute:
 #if __GNUC__ >= 4