re PR c++/36655 (unjustified warning for "extern template" when using -pedantic -std=c++0x)

/cp
2008-06-27  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/36655
	* pt.c (do_decl_instantiation): In c++0x mode do not warn for
	extern template.

/testsuite
2008-06-27  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/36655
	* g++.dg/cpp0x/extern_template.C: New.

From-SVN: r137200

gcc/cp/ChangeLog

+2008-06-27  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/36655
+	* pt.c (do_decl_instantiation): In c++0x mode do not warn for
+	extern template.
+
 2008-06-24  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
 	PR c++/23194

gcc/cp/pt.c

@@ -14588,8 +14588,8 @@ do_decl_instantiation (tree decl, tree storage)
     ;
   else if (storage == ridpointers[(int) RID_EXTERN])
     {
-      if (pedantic && !in_system_header)
-	pedwarn ("ISO C++ forbids the use of %<extern%> on explicit "
+      if (pedantic && !in_system_header && (cxx_dialect == cxx98))
+	pedwarn ("ISO C++ 1998 forbids the use of %<extern%> on explicit "
 		 "instantiations");
       extern_p = 1;
     }

gcc/testsuite/ChangeLog

+2008-06-27  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/36655
+	* g++.dg/cpp0x/extern_template.C: New.
+
 2008-06-27  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc.dg/gomp/pr27388-3.c: Adjust dg-final.

gcc/testsuite/g++.dg/cpp0x/extern_template.C

+// { dg-options "-std=c++0x -pedantic" }
+
+template <typename> void f() {}
+extern template void f<int>();