https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84044
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> (In reply to Martin Liška from comment #3)
> > Fixed on trunk by Richi's r256685. Is it intentional Richi that the revision
> > should fix such situations?
>
> Not really. It means that the following hunk removes too many TYPE_BINFOs
> I guess?
>
> @@ -5150,15 +5145,9 @@ free_lang_data_in_type (tree type)
> {
> free_lang_data_in_binfo (TYPE_BINFO (type));
> /* We need to preserve link to bases and virtual table for all
> - polymorphic types to make devirtualization machinery working.
> - Debug output cares only about bases, but output also
> - virtual table pointers so merging of -fdevirtualize and
> - -fno-devirtualize units is easier. */
> - if ((!BINFO_VTABLE (TYPE_BINFO (type))
> - || !flag_devirtualize)
> - && ((!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
> - && !BINFO_VTABLE (TYPE_BINFO (type)))
> - || debug_info_level != DINFO_LEVEL_NONE))
> + polymorphic types to make devirtualization machinery working.
> */
> + if (!BINFO_VTABLE (TYPE_BINFO (type))
> + || !flag_devirtualize)
> TYPE_BINFO (type) = NULL;
> }
> }
Reverting this hunk makes the warning visible again.
