https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97953
--- Comment #7 from Chris Clayton <chris2553 at googlemail dot com> --- Yes, Richard's correct. I'm building from snapshot releases. That's why I used the term "snapshot releases" in comment 4. I've cloned git://gcc.gnu.org/git/gcc.git and am bisecting between b642fca1c31b2e2175e0860daf32b4ee0d918085 (11-20201108) and c746fc40f4ec8cfc1092efd49d567751858d2099 (11-20201115). I'm not 100% sure this is correct because I'm anything but a git expert and I've never come across a tree that didn't have branches for different strands of development (e.g gcc-10 gcc-11). git bisect start... reported that there were only 7 commits and that feels right, so I'll blunder on until someone tells me I'm doing this wrong (an, hopefully, how I should be doing it)