Cpuid2cpuflags
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cpuinfo2cpuflags
There is no program cpuinfo2cpuflags but cpuid2cpuflags which can be emerged.
emerge app-portage/cpuid2cpuflags
https://github.com/mgorny/cpuid2cpuflags
$ mkdir /etc/portage/package.use # if not used yet $ echo "*/* $(cpuid2cpuflags)" > /etc/portage/package.use/00cpuflags
rpi4 sample arm64 : edsp neon thumb vfp vfpv3 vfpv4 vfp-d32 crc32 v4 v5 v6 v7 v8 thumb2
CPU_FLAGS_X86 is a USE_EXPAND variable containing instruction set and other CPU-specific features. CPU_FLAGS_PPC is a USE_EXPAND variable containing instruction set and other CPU-specific features. CPU_FLAGS_ARM is a USE_EXPAND variable containing instruction set and other CPU-specific features. page: