https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99172
--- Comment #5 from gcc-user at riseup dot net --- Starting with gcc-10 gentoo is not going to enable --enable-vtable-verify by default anymore. https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=63c16d8b5e71b5f8e6185965062cf9c836800c29
