re PR c++/46245 ([C++0x] rejects function with late-specified return type as a…

re PR c++/46245 ([C++0x] rejects function with late-specified return type as a non-type template parameter)

	PR c++/46245
	* decl.c (grokdeclarator): Complain later for auto parameter.
	* pt.c (splice_late_return_type): Handle use in a template
	type-parameter.

From-SVN: r174227

gcc/cp/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	PR c++/46245
+	* decl.c (grokdeclarator): Complain later for auto parameter.
+	* pt.c (splice_late_return_type): Handle use in a template
+	type-parameter.
+
 	PR c++/46696
 	* typeck.c (cp_build_modify_expr): Check DECL_DEFAULTED_FN.
 

gcc/cp/decl.c

@@ -8741,12 +8741,6 @@ grokdeclarator (const cp_declarator *declarator,
 	       || thread_p)
 	error ("storage class specifiers invalid in parameter declarations");
 
-      if (type_uses_auto (type))
-	{
-	  error ("parameter declared %<auto%>");
-	  type = error_mark_node;
-	}
-
       /* Function parameters cannot be constexpr.  If we saw one, moan
          and pretend it wasn't there.  */
       if (constexpr_p)
@@ -9727,6 +9721,12 @@ grokdeclarator (const cp_declarator *declarator,
       if (ctype || in_namespace)
 	error ("cannot use %<::%> in parameter declaration");
 
+      if (type_uses_auto (type))
+	{
+	  error ("parameter declared %<auto%>");
+	  type = error_mark_node;
+	}
+
       /* A parameter declared as an array of T is really a pointer to T.
 	 One declared as a function is really a pointer to a function.
 	 One declared as a member is really a pointer to member.  */

gcc/cp/pt.c

@@ -19315,7 +19315,12 @@ splice_late_return_type (tree type, tree late_return_type)
     return type;
   argvec = make_tree_vec (1);
   TREE_VEC_ELT (argvec, 0) = late_return_type;
-  if (processing_template_decl)
+  if (processing_template_parmlist)
+    /* For a late-specified return type in a template type-parameter, we
+       need to add a dummy argument level for its parmlist.  */
+    argvec = add_to_template_args
+      (make_tree_vec (processing_template_parmlist), argvec);
+  if (current_template_parms)
     argvec = add_to_template_args (current_template_args (), argvec);
   return tsubst (type, argvec, tf_warning_or_error, NULL_TREE);
 }

gcc/testsuite/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/auto23.C: New.
+	* g++.dg/cpp0x/auto9.C: Adjust.
+
 	* g++.dg/cpp0x/defaulted29.C: New.
 
 	* g++.dg/cpp0x/initlist51.C: New.

gcc/testsuite/g++.dg/cpp0x/auto23.C

+// PR c++/46245
+// { dg-options -std=c++0x }
+
+template<auto f()->int> struct A { };

gcc/testsuite/g++.dg/cpp0x/auto9.C

@@ -79,10 +79,10 @@ enum struct D : auto * { FF = 0 };		// { dg-error "must be an integral type|decl
 void
 bar ()
 {
-  try { } catch (auto i) { }			// { dg-error "invalid use of" }
-  try { } catch (auto) { }			// { dg-error "invalid use of" }
-  try { } catch (auto *i) { }			// { dg-error "invalid use of" }
-  try { } catch (auto *) { }			// { dg-error "invalid use of" }
+  try { } catch (auto i) { }			// { dg-error "parameter declared" }
+  try { } catch (auto) { }			// { dg-error "parameter declared" }
+  try { } catch (auto *i) { }			// { dg-error "parameter declared" }
+  try { } catch (auto *) { }			// { dg-error "parameter declared" }
 }
 
 void