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* 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
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