re PR c++/44443 (-Wunused-but-set-variable problem with unused attribute on type)

	PR c++/44443
	* decl.c (initialize_local_var): If TREE_USED is set on the type,
	set also DECL_READ_P on the decl.

	* c-c++-common/Wunused-var-11.c: New test.

From-SVN: r160387

gcc/cp/ChangeLog

+2010-06-07  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44443
+	* decl.c (initialize_local_var): If TREE_USED is set on the type,
+	set also DECL_READ_P on the decl.
+
 2010-05-25  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/44188

gcc/cp/decl.c

@@ -5508,6 +5508,8 @@ initialize_local_var (tree decl, tree init)
 
   /* Compute and store the initial value.  */
   already_used = TREE_USED (decl) || TREE_USED (type);
+  if (TREE_USED (type))
+    DECL_READ_P (decl) = 1;
 
   /* Generate a cleanup, if necessary.  */
   cleanup = cxx_maybe_build_cleanup (decl);

gcc/testsuite/ChangeLog

+2010-06-07  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44443
+	* c-c++-common/Wunused-var-11.c: New test.
+
 2010-06-07  Jan Hubicka  <jh@suse.cz>
 
 	* gcc.dg/ipa/pure-const-1.c: New testcase.

gcc/testsuite/c-c++-common/Wunused-var-11.c

+/* PR c++/44443 */
+/* { dg-options "-Wunused" } */
+/* { dg-do compile } */
+
+int i;
+
+void
+f1 ()
+{
+  const int * __attribute__((unused)) a = &i;
+  const int *b __attribute__((unused)) = &i;
+}