* c-parse.in (OFFSETOF, offsetof_member_designator): New.
        (primary): Handle offsetof.  Add error productions for faux functions.
        Move component_ref objc checking to build_component_ref.
        (reswords): Add offsetof.
        (rid_to_yy): Add offsetof.
        * c-tree.h (build_offsetof): Declare.
        * c-common.h (objc_is_public): Declare.
        * c-typeck.c (build_component_ref): Check objc_is_public.
        (build_offsetof): New.
        * stub-objc.c (objc_is_public): New.
        * objc/objc-act.c, objc/objc-act.h (objc_is_public): Rename
        from is_public.
        * ginclude/stddef.h (offsetof): Use __builtin_offsetof.
        * doc/extend.texi (Offsetof): Move from C++ section to C section
        and rewrite for __builtin_offsetof.
cp/
        * lex.c (reswords): Rename "__offsetof" to "__builtin_offsetof".
        * parser.c (struct cp_parser): Remove in_offsetof.
        (cp_parser_new): Don't set it.
        (cp_parser_unary_expression): Don't check it.
        (cp_parser_postfix_open_square_expression): Split out from ...
        (cp_parser_postfix_expression): ... here.
        (cp_parser_postfix_dot_deref_expression): Likewise.
        (cp_parser_builtin_offsetof): New.
        (cp_parser_primary_expression): Use it.
testsuite/
        * g++.dg/template/dependent-expr4.C: Use __builtin_offsetof.

From-SVN: r82549