In the previous post, I mentioned that buildcache has some unique properties compared to ccache and sccache. One of them is its Lua plugin system, which lets you write custom wrappers for programs that aren’t compilers in the traditional sense. With Bug 2027655 now merged, we can use this to cache Firefox’s WebIDL binding code generation.

I’m happy to announce that buildcache is now a first-class compiler cache in mach. This has been a long time coming, and I’m excited to finally see it land.