[Bug c/125618] [17 Regression] Wrong encoding of zero-sized arrays

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125618

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Uecker <uecker@gcc.gnu.org>:

https://gcc.gnu.org/g:68d3f1e2c20efe07f99de3720d1732c4b987ff22

commit r17-1397-g68d3f1e2c20efe07f99de3720d1732c4b987ff22
Author: Martin Uecker <uecker@tugraz.at>
Date:   Sat Jun 6 15:08:19 2026 +0200

    c: fix wrong encoding for zero-sized arrays [PR125618]

    This reverts one change from 106970adca69c9c577e6c75f4e69a08cd9ea2df0
    that replaced build_range_type with build_index_type.  In the function
    complete_array_type this breaks zero-sized arrays created from an empty
    initializer which there are represented using the C++ FE way [0, -1]
    causing issues on 32 bit architectures.

    After this partial revert this representation remains inconsistent to
    the usual C FE representation [0, NULL_TREE] (as before by change).

            PR c/125618

    gcc/c-family/ChangeLog:
            * c-common.cc (complete_array_type): Change back to using
            build_range_type.