Oooh, there is an "-MP" flag, which does... something? Anyway, it's all just a gigantic hack at this point: if we defer to gcc to figure out the accurate dependencies anyway, why do we even use make in the first place? I mean, I know the answer ("that's how it came to be, historically"), it just rubs me the wrong way since gcc, strictly speaking, is already a compiler driver that orchestrates running the internal utilities so it may as well just bloody learn how to run them all in one swell foop or whatever.