https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70847 --- Comment #1 from Jens Maurer <jens.maurer at gmx dot net> --- This situation is similar to bug 70342, except that my testcase - involves no -fsanitize=undefined, - is shorter, - hinges on "virtual", and - is a regression vs. gcc 5.x.