https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81301
--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> --- I also cannot reproduce it anymore w/ gcc-8.0.0-alpha20170806 snapshot. It must be fixed or made latent some time in between. % powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20170806 -Q --help=target | grep -e march -e mtune -mtune= [default] Known CPUs (for use with the -mcpu= and -mtune= options): The target CPU is e300c3, as the triplet says.