https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97323
--- Comment #6 from Matthias Klose <doko at debian dot org> ---
this is triggered by:
2015-05-19 Jan Hubicka <hubi...@ucw.cz>
* tree.c (verify_type_variant): Fix #undef.
(gimple_canonical_types_compatible_p): Move here from lto.c
(verify_type): Verify TYPE_CANONICAL compatibility.
* tree.h (gimple_canonical_types_compatible_p): Declare.
