https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119767
--- Comment #2 from Sam James <sjames at gcc dot gnu.org> --- Seems that Emacs fails with 10..trunk at least (not tried older than 10). The original Emacs report is with 14, but I've reproduced it with trunk. (If useful, SSH is available to a container on this machine that reproduces it.)