https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70147
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> --- Thank you Jakub for the reduced test-case. As I've read the source code, current_vtt_parm is properly defined in start_preparsed_function function. vtt_parm definition: /* In a base member initializer, we cannot rely on the vtable being set up. We have to indirect via the vtt_parm. */ So as suggested by Jakub, we have to somehow replace ((struct C *) this)->D.2663.D.2604._vptr.A with read of current_vtt_parm which can be quite easily passed to cp_ubsan_dfs_initialize_vtbl_ptrs. Question is how to easily replace these? Should I process a dfs_walk a replace all occurrences, or is there any easier approach? Thanks, Martin
