Bug#666539: Patch to type_traits works

[Mario Lang]

Hi.

The patch (http://clang.llvm.org/libstdc++4.7-clang11.patch) mentioned
in thsi bug report to type_traits in libstdc++ is very small, and
actually appears to fix the problem.  It is not only <chrono> that can
be included with this minimal change applied, now <thread> (which is a
quite nice part of C++11) can be used with clang as well since <thread> depends
on <chrono>.

Index: include/std/type_traits
===================================================================
--- include/std/type_traits	(revision 185724)
+++ include/std/type_traits	(working copy)
@@ -1746,7 +1746,7 @@
 
   template<typename _Tp, typename _Up>
     struct common_type<_Tp, _Up>
-    { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; };
+    { typedef typename decay<decltype(true ? declval<_Tp>() : declval<_Up>())>::type type; };
 
   template<typename _Tp, typename _Up, typename... _Vp>
     struct common_type<_Tp, _Up, _Vp...>


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