> On a somewhat related note, I'd be interested to hear if ccache > could be snuck into bootstrapping to speed up recompiles in the > intermediate stages, especially with incremental changes. (Anyone > tried this?) I've noted that ccache-ing only speeds up the first > stage, as one would expect.
> There might be a subtle issue with ccache assuming that the compiler > that created a cache-hit object did not change. I'm only aware of > ccache verifying compiler versions (string compare) in the > hit-check, which alone doesn't suffice to guarantee that the cache > is (or should be) hit. No, it records the timestamp of the compiler driver. These would always be different in a bootstrap run, so you would never get any cache hits for second and third stage object files. Ben
