[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 #14 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:6634a409124a884ff66b3756568a7daae7d3c295

commit r15-211-g6634a409124a884ff66b3756568a7daae7d3c295
Author: Qing Zhao <qing.z...@oracle.com>
Date:   Mon May 6 16:28:01 2024 +0000

    Update the C FE routine "add_flexible_array_elts_to_size" C++ FE routine
"layout_var_decl" to handle the cases when the DECL is union.

    PR c/53548

    Add testing cases to test the _bos for flexible array members in unions
    or alone in structures.

    gcc/c/ChangeLog:

            PR c/53548
            * c-decl.cc (add_flexible_array_elts_to_size): Handle the cases
            when the DECL is union.

    gcc/cp/ChangeLog:

            PR c/53548
            * decl.cc (layout_var_decl): Handle the cases when the DECL is
            union with a flexible array member initializer.

    gcc/testsuite/ChangeLog:

            PR c/53548
            * c-c++-common/fam-in-union-alone-in-struct-bos-1.c: New test.
            * c-c++-common/fam-in-union-alone-in-struct-bos.c: New test.