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

/cp
2008-06-29  Paolo Carlini  <paolo.carlini@oracle.com>

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

/testsuite
2008-06-29  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/36655
	* g++.dg/cpp0x/extern_template-2.C: New.
	* g++.dg/cpp0x/extern_template.C: Rename to...
	* g++.dg/cpp0x/extern_template-1.C: ... this.

From-SVN: r137261

gcc/cp/ChangeLog

+2008-06-29  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/36655
+	* pt.c (do_type_instantiation): In c++0x mode do not warn for
+	extern template.
+
 2008-06-29  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* Make-lang.in (cp-warn): Delete $(CXX_COMPAT_WARN).

gcc/cp/pt.c

@@ -14676,8 +14676,17 @@ do_type_instantiation (tree t, tree storage, tsubst_flags_t complain)
   if (storage != NULL_TREE)
     {
       if (pedantic && !in_system_header)
-	pedwarn("ISO C++ forbids the use of %qE on explicit instantiations",
-		storage);
+	{
+	  if (storage == ridpointers[(int) RID_EXTERN])
+	    {
+	      if (cxx_dialect == cxx98)
+		pedwarn("ISO C++ 1998 forbids the use of %<extern%> on "
+			"explicit instantiations");
+	    }
+	  else
+	    pedwarn("ISO C++ forbids the use of %qE on explicit "
+		    "instantiations", storage);
+	}
 
       if (storage == ridpointers[(int) RID_INLINE])
 	nomem_p = 1;

gcc/testsuite/ChangeLog

+2008-06-29  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/36655
+	* g++.dg/cpp0x/extern_template-2.C: New.
+	* g++.dg/cpp0x/extern_template.C: Rename to...
+	* g++.dg/cpp0x/extern_template-1.C: ... this.
+
 2008-06-29  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/36341

gcc/testsuite/g++.dg/cpp0x/extern_template-2.C

+// { dg-options "-std=c++0x -pedantic" }
+
+template <typename> class S {};
+extern template class S<int>;