https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91375
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
TYPE_BINFO (DECL_CONTEXT (vtable)) is NULL. DECL_CONTEXT is BDS_Mesh here,
from the -O0 compile where it is cleared here:
static void
free_lang_data_in_type (tree type, class free_lang_data_d *fld)
{
...
if (TYPE_BINFO (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. */
if (!BINFO_VTABLE (TYPE_BINFO (type))
|| !flag_devirtualize)
TYPE_BINFO (type) = NULL;
so I guess that flag_devirtualize is to blame since it may differ between
CUs and type merging may chose the instance from a !flag_devirtualize one.
A fix could be as simple as removing the !flag_devirtualize case.
Honza?
