Buck2: Our open source build system

Great to see this. I hope it takes off - Bazel is useful but I really like the principled approach behind it (see the Build Systems a la Carte paper), and Neil is scarily good from my experience of working with him so I'd expect that they've come up with something awesome.

One thing I find annoying with all of these general, language-agnostic build systems though is that they break the "citizenship" in the corresponding language. So while you can usually relatively easily build a Rust project that uses crates.io dependencies, or a Python project with PyPi dependencies, it seems hard to make a library built using Bazel/Buck available to non-Bazel/Buck users (i.e., build something available on crates.io or PyPi). Does anyone know of any tools or approaches that can help with that?

> One thing I find annoying with all of these general, language-agnostic build systems though is that they break the "citizenship" in the corresponding language

I mean, this is kind of the whole point. A language agnostic build system needs a way to express dependencies and relationships in a way that is agnostic to, and abstracts over, the underlying programming language and its associated ecosystem conventions.