system/gcc: (aarch64) cc1: error: unknown value ‘armv8-a’ for -mcpu
Found on aarch64:
$ gcc -o hello hello.c -mcpu=armv8-a
cc1: error: unknown value ‘armv8-a’ for -mcpu
cc1: note: valid arguments are: cortex-a35 cortex-a53 cortex-a57 cortex-a72 cortex-a73 thunderx thunderxt88p1 thunderxt88 thunderxt81 thunderxt83 xgene1 falkor qdf24xx exynos-m1 thunderx2t99p1 vulcan thunderx2t99 cortex-a55 cortex-a75 saphira cortex-a57.cortex-a53 cortex-a72.cortex-a53 cortex-a73.cortex-a35 cortex-a73.cortex-a53 cortex-a75.cortex-a55 generic
GCC may have been built wrong? We use this config.