On Wed, 2022-10-26 at 14:37 -0400, Rich Freeman wrote: > Another possible issue is bad -march settings. That usually is an > issue if you change your CPU and boot off of an existing hard drive. > If you're going to upgrade your CPU you should rebuild all of @system > (at least) with -march set to something very minimal. Don't assume > that a newer CPU does everything an existing one does - they sometimes > do drop instructions. You can set -mcpu to whatever you want, as a > bad -mcpu will only cause minor performance issues.
Further reading on this: https://wiki.gentoo.org/wiki/Safe_CFLAGS I've always used this as a reference for helping ensure make.conf is not only going to be well optimized, but produce reliable binaries.
