2010-11-13  Paolo Bonzini  <bonzini@gnu.org>

	* c-tree.h (enum c_typespec_kind): Add ctsk_none.
	(struct c_declspecs): Replace tagdef_seen_p and type_seen_p
	with typespec_kind.
	* c-decl.c (build_null_declspecs): Initialize typespec_kind.
	(shadow_tag_warned, check_compound_literal_type): Adjust
	uses of tag_defined_p.
	(declspecs_add_type): Set typespec_kind.
	* c-parser.c (c_parser_declaration_or_fndef,
	c_parser_declspecs, c_parser_struct_declaration,
	c_parser_parameter_declaration, c_parser_type_name,
	c_parser_objc_diagnose_bad_element_prefix): Adjust uses
	of type_seen_p.
	* c-typeck.c (c_cast_expr): Use typespec_kind instead of
	tag_defined_p, pass ctsk_firstref through.

testsuite:
2010-11-13  Paolo Bonzini  <bonzini@gnu.org>

	* gcc.dg/Wcxx-compat-8.c: Add testcases involving incomplete types.

From-SVN: r166699