When an artifact arg is added to a Run step, if the artifact is
installed, then the installation path is added rather than the cache
artifact path. This is probably something that should change in the
future, but the goal of this branch is to generally avoid breakage other
than that caused by phase separation.
Number of generated files is recorded in serialized Configuration. Maker
preallocates array of generated files so that loads and stores can be
synchronization-free (protected by the dependency tree ordering).
More progress on Compile Step Zig CLI lowering.
next thing to do is figure out how LazyPath is supposed to work now.
something like this:
* each Step that provides LazyPath objects has a setLazyPath and
getLazyPath function which takes a tagged union identifying which one
to access
* steps that fulfill LazyPath objects can freely call setLazyPath
without obtaining a lock because the dependency graph prevents
simultaneous access.
* similarly, steps that access LazyPath results can freely call
getLazyPath without obtaining a lock, because after modification,
there may be simultaneous reads from dependencies but they will all be
read-only
* a fulfilled LazyPath object is a read-only std.Build.Cache.Path.
Andrew Kelley