https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91130
--- Comment #21 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- FWIW in the environment: COLLECT_GCC_OPTIONS = '-B' '.' '-v' '-flto' '-MMD' '-MF' 'aaaa' '-mcpu=cortex-a72' '-mfloat-abi=hard' '-mtls-dialect=gnu' '-marm' '-march=armv8-a+crc+simd' So is this correct, or should an extra argument have been inserted after the -MMD option at this point?