[Bug c++/123277] [16 Regression] [[maybe_unused]] does not silence Wunused-local-typedefs for dependent typedefs since r16-5937

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123277

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:6dc335c506aca39af537180b2a0b23e640e5346e

commit r16-6462-g6dc335c506aca39af537180b2a0b23e640e5346e
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jan 2 09:18:02 2026 +0100

    c++: Fix up is_late_template_attribute for [[maybe_unused]] [PR123277]

    is_late_template_attribute wants to return false for gnu::unused, gnu::used
    and maybe_unused attributes, so that -Wunused-local-typedefs sees those
    attributes applied even to typedefs to dependent types.
    Before my recent r16-5937 change, for maybe_unused this happened to work
    through the lookup_attribute_spec returning NULL in that case because
    there is no gnu::maybe_unused attribute, but when that has been fixed,
    maybe_unused needs to be listed in the exceptions next to unused and used
    attributes.

    2026-01-02  Jakub Jelinek  <jakub@redhat.com>

            PR c++/123277
            * decl2.cc (is_late_template_attribute): Return false also for
            [[maybe_unused]] attribute on TYPE_DECLs to dependent types.

            * g++.dg/warn/Wunused-local-typedefs-5.C: New test.