https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124512
--- Comment #6 from Patrick Welche <prlw1 at cam dot ac.uk> --- It seems to be defined in gcc/config/aarch64/driver-aarch64.cc The comment at the top says /* This will be called by the spec parser in gcc.cc when it sees a %:local_cpu_detect(args) construct. Currently it will be called with either "arch", "cpu" or "tune" as argument depending on if -march=native, -mcpu=native or -mtune=native is to be substituted. Just guessing: parallel build race in which it is called before having been compiled?
