Yes, I spent years working on exactly that. I personally was working with a compiler team to validate changes to eliminate non-determinism. That’s why I felt qualified to make the statement I did.

It’s non trivial because you have to back through decades of tools and fix all of them to remove non determinism because they weren’t designed with that in mind.

The hardest part was ensuring build environment uniformity but that’s a lot easier with docker and similar tooling.