Added #pragma clang system_header

include/boost/exception/exception.hpp

@@ -16,13 +16,18 @@ namespace boost { template <class T> class shared_ptr; }
 namespace boost { namespace exception_detail { using boost::shared_ptr; } }
 #endif
 
-#if defined(__GNUC__) && (__GNUC__*100+__GNUC_MINOR__>301) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
+#if !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
+#if __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
-#if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
+#ifdef __clang__
+#pragma clang system_header
+#endif
+#ifdef _MSC_VER
 #pragma warning(push,1)
 #pragma warning(disable: 4265)
 #endif
+#endif
 
 namespace
 boost