[Bug c++/126093] (reflection) ICE in write_unqualified_name, at cp/mangle.cc:1570

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126093

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-16 branch has been updated by Jakub Jelinek
<[email protected]>:

https://gcc.gnu.org/g:9960824ebdee198f3dfff5545b630f5ab3c5ebfa

commit r16-9550-g9960824ebdee198f3dfff5545b630f5ab3c5ebfa
Author: Jakub Jelinek <[email protected]>
Date:   Tue Aug 18 17:49:11 2026 +0200

    c++: Fix ICE during mangling of a conversion operator function template
[PR126093]

    On Tue, Aug 11, 2026 at 04:25:19PM -0400, Jason Merrill wrote:
    > On 8/7/26 8:45 AM, Jakub Jelinek wrote:
    > > We ICE when trying to mangle the TEMPLATE_DECL of a conversion
operator,
    > > because FNDECL_USED_AUTO macro requires FUNCTION_DECL, but here we
    > > have a TEMPLATE_DECL instead.
    > > In this case, DECL_CONV_FN_TYPE contains the right type, so this patch
    > > just guards the FNDECL_USED_AUTO macro use on FUNCTION_DECLs.
    >
    > Hmm, if it's valid to get a TEMPLATE_DECL here I think we want to
    > STRIP_TEMPLATE earlier in the function to avoid the need for this; lots
of
    > other things here seem to assume we're looking at the inner decl.

    Ok, here is a different patch then to use STRIP_TEMPLATE before calling
    write_unqualified_name in the {class,function,variable,alias} template,
    concept, namespace alias and namespace (for the last two STRIP_TEMPLATE
    will do nothing, so I haven't moved it to a separate handling).

    2026-08-17  Jakub Jelinek  <[email protected]>

            PR c++/126093
            * mangle.cc (write_reflection): Call write_unqualified_name on
            STRIP_TEMPLATE (arg) rather than just arg.

            * g++.dg/reflect/mangle1.C: Add 2 new tests for reflections of
            conversion templates.

    Reviewed-by: Jason Merrill <[email protected]>
    (cherry picked from commit 91e2f5a8aac9c9825e4a13e8f7451bc6d8f75790)