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PR c++/13275 * c-common.h (enum rid): Add RID_OFFSETOF. * c-parser.in (rid_to_yy): Ignore RID_OFFSETOF. * ginclude/stddef.h (offsetof): Reimplement for C++, using __offsetof__. * doc/extend.texi: Document __offsetof__. PR c++/13275 * lex.c (reswords): Add "__offsetof" and "__offsetof__". * parser.c (cp_parser): Add in_offsetof_p. (cp_parser_new): Initialize it. (cp_parser_primary_expression): Handle __offsetof__ (...). (cp_parser_postfix_expression): Allow casts to pointer type and uses of "->" in a constant expression if implementing offsetof. (cp_parser_unary_expression): Allow the use of "&" in a constant expression if implementing offsetof. PR c++/13275 * g++.dg/other/offsetof2.C: Remove XFAIL. * g++.dg/parse/offsetof1.C: New test. * g++.gd/parse/offsetof2.C: Likewise. From-SVN: r74702
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