re PR c/20385 (Lame parse error message for undefined type)

gcc:
2010-12-17  Paolo Bonzini  <bonzini@gnu.org>

	PR c/20385
	* function.c (used_types_insert): Handle ERROR_MARK.
	* c-decl.c (grokdeclarator): Handle ERROR_MARK.
	(declspecs_add_type): Leave error_mark_node in specs->type.
	(finish_declspecs): Change it to integer_type_node here.
	* c-parser.c (c_parser_peek_2nd_token): Move earlier.
	(enum c_lookahead_kind): New.
	(c_parser_next_token_starts_typename): New name of
	c_parser_next_tokens_start_typename.  Accept lookahead enum
	and handle it here instead of...
	(c_parser_next_tokens_start_declaration): ... here.  Call it.
	(c_parser_declspecs): Accept another argument.  Do not exit
	on C_ID_ID if it is guessed to be an unknown typename.
	(c_parser_parms_declarator): Use 2nd token to distinguish a K&R
	declaration from an ANSI declaration starting with an unknown
	typename.
	(c_parser_struct_declaration, c_parser_objc_type_name,
	c_parser_typeof_specifier, c_parser_declarator,
	c_parser_direct_declarator_inner): Adjust calls.
	(c_parser_parameter_declaration): Likewise.
	(c_parser_type_name): Pass back an error_mark_node to the caller.
	(c_parser_postfix_expression): Do error recovery when 
	c_parser_type_name returns NULL.

testsuite:
2010-12-17  Paolo Bonzini  <bonzini@gnu.org>

	PR c/20385
	* objc.dg/tls/init-2.m: Adjust.
	* gcc.dg/noncompile/920923-1.c: Adjust.
	* gcc.dg/noncompile/pr44517.c: Adjust.
	* gcc.dg/declspec-18.c: New test.

From-SVN: r167999