2015-02-27  Marek Polacek  <polacek@redhat.com>

	PR c/65228
c/
	* c-decl.c (start_decl): Return NULL_TREE if decl is an error node.
testsuite/
	* gcc.dg/pr65228.c: New test.

--- gcc/c/c-decl.c	(revision 221055)
+++ gcc/c/c-decl.c	(revision 221056)
@@ -4460,8 +4460,8 @@ start_decl (struct c_declarator *declara
   decl = grokdeclarator (declarator, declspecs,
 			 NORMAL, initialized, NULL, &attributes, &expr, NULL,
 			 deprecated_state);
-  if (!decl)
-    return 0;
+  if (!decl || decl == error_mark_node)
+    return NULL_TREE;
 
   if (expr)
     add_stmt (fold_convert (void_type_node, expr));
--- gcc/testsuite/gcc.dg/pr65228.c	(revision 0)
+++ gcc/testsuite/gcc.dg/pr65228.c	(revision 221056)
@@ -0,0 +1,11 @@
+/* PR c/65228 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+__auto_type a = b; /* { dg-error "undeclared" } */
+
+void
+f (void)
+{
+  __auto_type c = d; /* { dg-error "undeclared" } */
+}