[Bug c++/68727] [5/6/7 regression] invalid offsetof expressions accepted

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68727

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 26 19:39:40 2017
New Revision: 244949

URL: https://gcc.gnu.org/viewcvs?rev=244949&root=gcc&view=rev
Log:
        PR c++/68727
        * cp-tree.def (OFFSETOF_EXPR): Bump number of operands to 2.
        * cp-tree.h (finish_offsetof): Add OBJECT_PTR argument.
        * parser.c (cp_parser_builtin_offsetof): Pass result of
        build_static_cast of null_pointer_node to finish_offsetof.
        * semantics.c (finish_offsetof): Add OBJECT_PTR argument, use
        it for -Winvalid-offsetof pedwarn instead of trying to guess
        original offsetof type from EXPR.  Save OBJECT_PTR as a new
        second operand to OFFSETOF_EXPR.
        * pt.c (tsubst_copy_and_build) <case OFFSETOF_EXPR>: Adjust
        finish_offsetof caller, pass the second operand of OFFSETOF_EXPR
        as OBJECT_PTR.

        * g++.dg/other/offsetof8.C: Add expected error.
        * g++.dg/other/offsetof9.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/other/offsetof9.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.def
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/parser.c
    trunk/gcc/cp/pt.c
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/other/offsetof8.C