[Bug c/53548] allow flexible array members in unions like zero-length arrays

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53548

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Qing Zhao <qinz...@gcc.gnu.org>:

https://gcc.gnu.org/g:f27fc59d9f7c735d200fda647a487850144b10eb

commit r15-209-gf27fc59d9f7c735d200fda647a487850144b10eb
Author: Qing Zhao <qing.z...@oracle.com>
Date:   Mon May 6 16:26:19 2024 +0000

    C and C++ FE changes to support flexible array members in unions and alone
in structures. Adjust testcases for flexible array member in union and alone in
structure extension.

    PR c/53548

    gcc/c/ChangeLog:

            PR c/53548
            * c-decl.cc (finish_struct): Change errors to pedwarns for the
cases
            flexible array members in union or alone in structures.

    gcc/cp/ChangeLog:

            PR c/53548
            * class.cc (diagnose_flexarrays): Change error to pdewarn for the
case
            flexible array members alone in structures.
            * decl.cc (grokdeclarator): Change error to pdewarn for the case
            flexible array members in unions.

    gcc/ChangeLog:

            PR c/53548
            * stor-layout.cc (place_union_field): Use zero sizes for flexible
array
            member fields.

    gcc/testsuite/ChangeLog:

            PR c/53548
            * c-c++-common/builtin-clear-padding-3.c: Adjust testcase.
            * g++.dg/ext/flexary12.C: Likewise.
            * g++.dg/ext/flexary19.C: Likewise.
            * g++.dg/ext/flexary2.C: Likewise.
            * g++.dg/ext/flexary3.C: Likewise.
            * g++.dg/ext/flexary36.C: Likewise.
            * g++.dg/ext/flexary4.C: Likewise.
            * g++.dg/ext/flexary5.C: Likewise.
            * g++.dg/ext/flexary8.C: Likewise.
            * g++.dg/torture/pr64280.C: Likewise.
            * gcc.dg/20050620-1.c: Likewise.
            * gcc.dg/940510-1.c: Likewise.