bind: silence warning with gcc

include/boost/bind/arg.hpp

@@ -22,6 +22,11 @@
 #include <boost/config.hpp>
 #include <boost/is_placeholder.hpp>
 
+#if BOOST_GCC >= 40700
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
+#endif
+
 namespace boost
 {
 
@@ -57,4 +62,9 @@ template< int I > struct is_placeholder< arg<I> (*) () >
 
 } // namespace boost
 
+#if BOOST_GCC >= 40700
+#pragma GCC diagnostic pop
+#endif
+
+
 #endif // #ifndef BOOST_BIND_ARG_HPP_INCLUDED