Comment by unsatchmo

This is silly. If I’m only rebuilding 1 file out of a 200 file source base, I guarantee the non-unity build will be faster. Just the number of characters I have to tokenize in this thought experiment should be enough to convince. If this isn’t the case then you’re doing some sort of n^2 c++ boost every header includes most other headers shenanigans and you need to stop that rather than doing a unity build.