https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71912
--- Comment #2 from drepper.fsp+rhbz at gmail dot com <drepper.fsp+rhbz at gmail dot com> --- If it is accepted that this code should work (as I also expect) then this bug should also be marked as a regression to 5.x. 6.1 at least is broken, I don't know when it stopped working.