https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99410
--- Comment #3 from Giulio Benetti <giulio.benetti at benettiengineering dot com> --- Ah no, wait, that happens with older binutils too, so it doesn't look like the same and most of all it stop to show with gcc 8.x, so it seems that gcc create a particular Assembly that GAS doesn't like or can't handle.