https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94711
--- Comment #3 from Matthew Malcomson <matmal01 at gcc dot gnu.org> --- This has been fixed by. https://gcc.gnu.org/pipermail/gcc-patches/2020-April/544625.html In the email linked above I mentioned another problem using `-mabi=apcs-gnu`. Since that ABI is obsolete (Kyrylo pointed that out to me) I don't think that problem should hold up GCC10.