> I see that build in build-self.scm isn't a derivation, but most of the time > spent in build is, to my knowledge, while the daemon is building the > build-program derivation. build-program in build-self.scm returns a > gexp->script file-like object and I see various /gnu/store > *-compute-guix-derivation.drv files in my store.
Sorry, saying "most of the time is spent on building the build-program derivation" is not correct. Most of the time is spent on running the compute-guix-derivation script. D'oh. I'll spend more time trying to understand the current system.