re PR c++/36760 (Simple std::bind use causes warnings with -Wextra)

/cp
2008-07-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/36760
	* pt.c (tsubst_function_type): Don't warn for type qualifiers
	on function return type in case of system header.

/testsuite
2008-07-09  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/36760
	* g++.dg/warn/pragma-system_header5.C: New.
	* g++.dg/warn/pragma-system_header5.h: Likewise.

From-SVN: r137660

gcc/cp/ChangeLog

+2008-07-09  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/36760
+	* pt.c (tsubst_function_type): Don't warn for type qualifiers
+	on function return type in case of system header.
+
 2008-07-09  Raksit Ashok <raksit@google.com>
 
 	* parser.c (cp_parser_postfix_expression): New warning based on flag

gcc/cp/pt.c

@@ -8768,6 +8768,7 @@ tsubst_function_type (tree t,
   if (TYPE_QUALS (return_type) != TYPE_UNQUALIFIED
       && in_decl != NULL_TREE
       && !TREE_NO_WARNING (in_decl)
+      && !DECL_IN_SYSTEM_HEADER (in_decl)
       && (SCALAR_TYPE_P (return_type) || VOID_TYPE_P (return_type)))
     warning (OPT_Wignored_qualifiers,
             "type qualifiers ignored on function return type");

gcc/testsuite/ChangeLog

+2008-07-09  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/36760
+	* g++.dg/warn/pragma-system_header5.C: New.
+	* g++.dg/warn/pragma-system_header5.h: Likewise.
+
 2008-07-09  Raksit Ashok <raksit@google.com>
 
 	* gcc.dg/wdisallowed-functions-1.c: New test.

gcc/testsuite/g++.dg/warn/pragma-system_header5.C

+// PR c++/36760
+// { dg-options "-Wextra" }
+
+#include "pragma-system_header5.h"
+
+void f()
+{
+  g<const double>();
+  g<volatile void>();
+}

gcc/testsuite/g++.dg/warn/pragma-system_header5.h

+#pragma GCC system_header
+
+template <typename T> T g();