[Bug c++/125770] reflection regression on members_of(global-namespace)

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125770

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-16 branch has been updated by Marek Polacek
<mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:6db6adbe9ccab6f673a3be15caad5d7ad783002a

commit r16-9115-g6db6adbe9ccab6f673a3be15caad5d7ad783002a
Author: Marek Polacek <polacek@redhat.com>
Date:   Fri Jun 12 15:46:10 2026 -0400

    c++: bogus error with meta::members_of [PR125770]

    mark_used produces the
    use of built-in parameter pack '__integer_pack' outside of a template
    error even when called with tf_none (in this case, from
    resolve_type_of_reflected_decl).

    I played with the idea of skipping all fndecl_built_in_p functions
    in resolve_type_of_reflected_decl but it doesn't seem to make any
    reasonable difference on compile time.

            PR c++/125770

    gcc/cp/ChangeLog:

            * decl2.cc (mark_used): Check complain & tf_error before giving
            an error.

    gcc/testsuite/ChangeLog:

            * g++.dg/reflect/members_of15.C: New test.

    Reviewed-by: Jason Merrill <jason@redhat.com>
    (cherry picked from commit 73c9662616a7de98cb740c36e5df006afb26c1d1)