How to make Firefox builds 17% faster

Can you (err... buildcache) cache Rust proc-macros? I've been battling this with sccache and I'm now maintaining a 10-patch deep stack for the next.js build CI.

Windows builds were ridiculously poor on cache hits rates too because of non-determinism that was not able to figure out.

I'd be happy to test it out.

I’m not too familiar with Firefox builds. Why are clobber builds common? At first glance it seems weird to add a cache around your build system vs fixing your build system.

I guess “purge 17% of the code” is not the correct answer?

wow, 17% is impressive with such an easy fix. i wonder if we could just build this as a separate project and pull the webidl files as a dependency.

Why compile code when ccache faster

So ... perhaps Mozilla should focus on user share dropping.

I understand that speed is relevant, but focusing on that strategy does not really work when dinosaur-like extinction is around the corner.