PR c++/51541 - ICE with invalid identifier in alias-declaration

gcc/cp/

	PR c++/51541
	* parser.c (cp_parser_alias_declaration): Get out early upon
	errors in the identifier or the attributes.

gcc/testsuite/

	PR c++/51541
	* g++.dg/cpp0x/alias-decl-18.C: New test.

From-SVN: r182935

gcc/cp/ChangeLog

+2012-01-05  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/51541
+	* parser.c (cp_parser_alias_declaration): Get out early upon
+    	errors in the identifier or the attributes.
+
 2012-01-04  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/51064

gcc/cp/parser.c

@@ -15046,7 +15046,13 @@ cp_parser_alias_declaration (cp_parser* parser)
   cp_parser_require_keyword (parser, RID_USING, RT_USING);
   id_location = cp_lexer_peek_token (parser->lexer)->location;
   id = cp_parser_identifier (parser);
+  if (id == error_mark_node)
+    return error_mark_node;
+
   attributes = cp_parser_attributes_opt (parser);
+  if (attributes == error_mark_node)
+    return error_mark_node;
+
   cp_parser_require (parser, CPP_EQ, RT_EQ);
 
   /* Now we are going to parse the type-id of the declaration.  */

gcc/testsuite/ChangeLog

+2012-01-05  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/51541
+	* g++.dg/cpp0x/alias-decl-18.C: New test.
+
 
 2012-01-05  Eric Botcazou  <ebotcazou@adacore.com>
 

gcc/testsuite/g++.dg/cpp0x/alias-decl-18.C

+// Origin: PR c++/51541
+// { dg-options -std=c++11 }
+
+template<typename Z> using ::T = void(int n); // { dg-error "" }
+template<typename Z> using operator int = void(int n); // { dg-error "" }
+template<typename Z> using typename U = void; // { dg-error "" }
+template<typename Z> using typename ::V = void(int n); // { dg-error "" }
+template<typename Z> using typename ::operator bool = void(int n); // { dg-error "" }
+using foo __attribute__((aligned(4)) = int; // { dg-error "" }