re PR c++/56794 (C++11 Error in range-based for with parameter pack array)

	PR c++/56794
	* parser.c (cp_parser_range_for): Don't try to do auto deduction
	in a template if the type of the range is incomplete.

From-SVN: r197324

gcc/cp/ChangeLog

 2013-04-01  Jason Merrill  <jason@redhat.com>
 
+	PR c++/56794
+	* parser.c (cp_parser_range_for): Don't try to do auto deduction
+	in a template if the type of the range is incomplete.
+
 	* call.c (add_function_candidate): Take the address of 'this' here.
 	(build_over_call): And here.
 	(build_new_method_call_1, build_op_call_1): Not here.

gcc/cp/parser.c

@@ -9615,7 +9615,10 @@ cp_parser_range_for (cp_parser *parser, tree scope, tree init, tree range_decl)
 	range_expr = error_mark_node;
       stmt = begin_range_for_stmt (scope, init);
       finish_range_for_decl (stmt, range_decl, range_expr);
-      if (!type_dependent_expression_p (range_expr)
+      if (range_expr != error_mark_node
+	  && !type_dependent_expression_p (range_expr)
+	  /* The length of an array might be dependent.  */
+	  && COMPLETE_TYPE_P (TREE_TYPE (range_expr))
 	  /* do_auto_deduction doesn't mess with template init-lists.  */
 	  && !BRACE_ENCLOSED_INITIALIZER_P (range_expr))
 	do_range_for_auto_deduction (range_decl, range_expr);

gcc/testsuite/g++.dg/cpp0x/range-for24.C

+// PR c++/56794
+// { dg-require-effective-target c++11 }
+
+template<int... values>
+static void Colors()
+{
+    static const int colors[] = { values... };
+
+    for(auto c: colors) { }
+}
+
+int main()
+{
+    Colors<0,1,2> ();
+}