https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95952
--- Comment #12 from Mikael Pettersson <mikpelinux at gmail dot com> --- (In reply to Peter Bergner from comment #11) > At some point in the past, GCC used to disable some instruction patterns > depending on whether the binutils you're building against supports those > instructions or not. Now, GCC will always generate every instruction you > ask it to, but you might get an assembler error trying to assemble those > instructions. I think that change was somewhere in the GCC8 or GCC9 > timeframe. It could be your old binutils in GCC8 is silently turning off > some support and that is causing the problem. I'll try building a 2.23ish > binutils and using that for my GCC8 build. OK. Meanwhile I had a successful bootstrap of GCC8 with binutils-2.34.