[Bug c++/121552] [C++20] Implement C++20 P1766R1 - Mitigating minor modules maladies

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121552

--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:b6825a7ce698b65657e952e437ab9edd655fe5a5

commit r17-2172-gb6825a7ce698b65657e952e437ab9edd655fe5a5
Author: Jason Merrill <ja...@redhat.com>
Date:   Wed Jul 1 11:49:39 2026 -0400

    c++: naming typedef and incomplete class [PR126031]

    We can't look at the bases and members of a forward-declared nested class,
    and such a forward declaration can't contain problematic constructs, so
    treat it as OK.

            PR c++/126031
            PR c++/121552

    gcc/cp/ChangeLog:

            * decl.cc (maybe_diagnose_non_c_class_typedef_for_linkage): Handle
            incomplete type.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/typedef2.C: New test.