https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111768
--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> --- I think it's similar to attempting -march=native under distcc, which is already warned about on Gentoo wiki: https://wiki.gentoo.org/wiki/Distcc The difference here is that Intel so far decided to make ISA feature set the same between 'performance' and 'power-efficient' cores, so the differences for -march=native detection are minimal. Intel also added a cpuid bit for hybrid CPUs, so in principle native arch detection could inspect that bit and then override l1-cache-size to 32 KiB (having the exact size in the param is not important, specifying a lower value is ok), or just drop it and let cc1 fall back to the default value (64) from params.opt. Short term, I would advise users to add --param=l1-cache-size=32 after -march=native in CFLAGS.
