[Bug testsuite/126708] [17 Regression] attr-callback.c failures

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126708

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Josef Melcr <[email protected]>:

https://gcc.gnu.org/g:37807a10d8816f650d38d6f59a4e230ddc9f785a

commit r17-3181-g37807a10d8816f650d38d6f59a4e230ddc9f785a
Author: Josef Melcr <[email protected]>
Date:   Thu Jul 30 15:21:19 2026 +0200

    Use positional_argument in callback_only attribute handler

    This patch replaces some of the manual bounds checking done in the
    callback_only attribute handler with calls to positional_argument.
    Since positional_argument issues warnings and the attribute handler
    issues errors, I decided to downgrade the errors to warnings for
    consistency.

            PR testsuite/126708

    gcc/c-family/ChangeLog:

            * c-attribs.cc (handle_callback_only_attribute): Use
            positional_argument for bounds checking in callback_only
            attribute handler, downgrade errors to warnings for
            consistency.

    gcc/testsuite/ChangeLog:

            * gcc.dg/attr-callback.c: Expect warnings instead of errors,
            adjust expected messages.

    Signed-off-by: Josef Melcr <[email protected]>