c-tree.h (enum c_typespec_kind, [...]): New.
* c-tree.h (enum c_typespec_kind, struct c_typespec,
parser_xref_tag): New.
(struct c_declspecs): Add tag_defined_p. Adjust definition of
typedef_p.
(declspecs_add_type): Adjust prototypes.
* c-parse.in (%union): Add tstype.
(typespec_nonattr, typespec_attr, typespec_reserved_nonattr,
typespec_reserved_attr, typespec_nonreserved_nonattr,
structsp_attr, structsp_nonattr): Change to tstype. Update
actions.
* c-decl.c (build_null_declspecs): Initialize tag_defined_p.
(declspecs_add_type): Update to take struct c_typespec argument.
Set tag_defined_p and typedef_p as appropriate.
(xref_tag): Rename to parser_xref_tag and replace by wrapper.
Update to return struct c_typespec.
(shadow_tag_warned): Don't let empty declarations with qualifiers
or storage class specifiers redeclare a tag if a previous
declaration is visible.
testsuite:
* gcc.dg/c99-tag-3.c, gcc.dg/declspec-14.c: New tests.
From-SVN: r89021