On Wednesday, 15 June 2016 at 12:00:52 UTC, Andrei Alexandrescu
I'd say the gating factor is -j. If an build system doesn't
implement the equivalent of make -j, that's a showstopper.
Don't worry, there is a --threads option and it defaults to the
number of logical cores.
I just did some tests and the reason it is slower than Make is
because of the automatic dependency detection on every single
command. I disabled the automatic dependency detection and
compared it with Make again. Button was then roughly the same
speed as Make -- sometimes it was faster, sometimes slower.
Although, I think getting accurate dependencies at the cost of
slightly slower builds is very much a worthwhile trade-off.