https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93496
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Justin LaPolla from comment #2) > 3. My current project requires that we compile with GCC 8.1.0. To avoid this > bug, we are disallowing virtual inheritance in our code by compiling with > `-Werror=virtual-inheritance'. Is this sufficient? Yes. I'll do a bisection later to find when/how it was fixed.