PR c++/53551 - -Wunused-local-typedefs misses uses

We don't record the use of a typedef when it's used through a
typename.  Fixed thus.

Tested on x86_64-unknown-linux-gnu against trunk.

gcc/cp/

	* decl.c (make_typename_type): Record the use of typedefs.

gcc/testsuite/

	* g++.dg/warn/Wunused-local-typedefs-2.C: New test.

From-SVN: r191828

gcc/cp/ChangeLog

+2012-09-25  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/53551 - -Wunused-local-typedefs misses uses
+	* decl.c (make_typename_type): Record the use of typedefs.
+
 2012-09-27  Jakub Jelinek  <jakub@redhat.com>
 
 	* init.c (build_new_1): Don't test TREE_CONSTANT

gcc/cp/decl.c

@@ -3327,6 +3327,8 @@ make_typename_type (tree context, tree name, enum tag_types tag_type,
   if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
     t = TREE_TYPE (t);
 
+  maybe_record_typedef_use (t);
+
   return t;
 }
 

gcc/testsuite/ChangeLog

+2012-09-25  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/53551 - -Wunused-local-typedefs misses uses
+	* g++.dg/warn/Wunused-local-typedefs-2.C: New test.
+
 2012-09-28  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/54716

gcc/testsuite/g++.dg/warn/Wunused-local-typedefs-2.C

+// Origin PR c++/33255
+// { dg-options "-Wunused" } <-- should trigger -Wunused-local-typedefs
+// { dg-do compile { target c++11 } }
+
+template <typename C>
+struct structure
+{
+    typename C::type val;
+};
+
+int
+main()
+{
+  struct context
+  {
+      using type = int;
+  };
+
+  return structure<context>{42}.val;
+}