Merge pull request #324 from zhykzhykzhyk/patch-1

Ensure manage_exception_state uses correct TLS

Author: olk

include/boost/context/fiber_fcontext.hpp

@@ -87,11 +87,11 @@ struct __cxa_eh_globals {
 
 class manage_exception_state {
 public:
-    manage_exception_state() {
-        exception_state_ = *__cxa_get_globals();
+    BOOST_NOINLINE manage_exception_state() {
+        exception_state_ = *(volatile __cxa_eh_globals *)__cxa_get_globals();
     }
-    ~manage_exception_state() {
-        *__cxa_get_globals() = exception_state_;
+    BOOST_NOINLINE ~manage_exception_state() {
+        *(volatile __cxa_eh_globals *)__cxa_get_globals() = exception_state_;
     }
 private:
     __cxa_eh_globals exception_state_;