[Bug sanitizer/70147] [6 Regression] testcase from hana testsuite gets miscompiled with -fsanitize=undefined

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70147

--- Comment #30 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri Mar 18 15:31:35 2016
New Revision: 234335

URL: https://gcc.gnu.org/viewcvs?rev=234335&root=gcc&view=rev
Log:
        PR c++/70147 - handle primary virtual bases

        * class.c (vptr_via_virtual_p): New.
        (most_primary_binfo): Factor out of build_rtti_vtbl_entries.
        * cp-ubsan.c (cp_ubsan_dfs_initialize_vtbl_ptrs): Don't clear
        a vptr from any virtual base in a not-in-charge 'structor.

Added:
    trunk/gcc/testsuite/g++.dg/ubsan/vptr-11.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/class.c
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/cp-ubsan.c