[Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address

["amker at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

--- Comment #9 from amker at gcc dot gnu.org 2012-06-12 03:11:03 UTC ---
Author: amker
Date: Tue Jun 12 03:10:55 2012
New Revision: 188418

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188418
Log:
    Backport r180986 from mainline
    2011-11-04  Eric Botcazou  <ebotcazou@adacore.com>

    PR c++/50608
    * c-common.c (c_fully_fold_internal) <ADDR_EXPR>: Call fold_offsetof_1.
    (fold_offsetof_1): Make global.  Remove STOP_REF argument and adjust.
    <INDIRECT_REF>: Return the argument.
    <ARRAY_REF>: Remove special code for negative offset.
    Call fold_build_pointer_plus instead of size_binop.
    (fold_offsetof): Remove STOP_REF argument and adjust.
    * c-common.h (fold_offsetof_1): Declare.
    (fold_offsetof): Remove STOP_REF argument.

    PR c++/50608
    * c-parser.c (c_parser_postfix_expression) <RID_OFFSETOF>: Adjust call
    to fold_offsetof.
    * c-typeck.c (build_unary_op) <ADDR_EXPR>: Call fold_offsetof_1.

    * g++.dg/other/offsetof7.C: New test.

    PR c++/50608
    * semantics.c (finish_offsetof): Adjust call to fold_offsetof.
    * typeck.c (cp_build_addr_expr_1): Call fold_offsetof_1.


Added:
    branches/ARM/embedded-4_6-branch/gcc/c-family/ChangeLog.arm
    branches/ARM/embedded-4_6-branch/gcc/cp/ChangeLog.arm
    branches/ARM/embedded-4_6-branch/gcc/testsuite/g++.dg/other/offsetof7.C
Modified:
    branches/ARM/embedded-4_6-branch/gcc/ChangeLog.arm
    branches/ARM/embedded-4_6-branch/gcc/c-family/c-common.c
    branches/ARM/embedded-4_6-branch/gcc/c-family/c-common.h
    branches/ARM/embedded-4_6-branch/gcc/c-parser.c
    branches/ARM/embedded-4_6-branch/gcc/c-typeck.c
    branches/ARM/embedded-4_6-branch/gcc/cp/semantics.c
    branches/ARM/embedded-4_6-branch/gcc/cp/typeck.c
    branches/ARM/embedded-4_6-branch/gcc/testsuite/ChangeLog.arm