re PR libstdc++/64657 (Support iterators with overloaded operator-comma)

	PR libstdc++/64657
	* include/bits/stl_uninitialized.h
	(__uninitialized_copy::__uninit_copy): Cast expression to void.

From-SVN: r224736

libstdc++-v3/ChangeLog

+2015-06-22  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/64657
+	* include/bits/stl_uninitialized.h
+	(__uninitialized_copy::__uninit_copy): Cast expression to void.
+
 2015-06-17  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/55409

libstdc++-v3/include/bits/stl_uninitialized.h

@@ -71,7 +71,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  _ForwardIterator __cur = __result;
 	  __try
 	    {
-	      for (; __first != __last; ++__first, ++__cur)
+	      for (; __first != __last; ++__first, (void)++__cur)
 		std::_Construct(std::__addressof(*__cur), *__first);
 	      return __cur;
 	    }