Eurydice: a Rust to C compiler (yes)

Perhaps the greatest surprise of the last two years was, for me, the realization that people not only care about compiling C to Rust (for obvious reasons, such as, ahem, memory safety) – they also care about compiling Rust to C! Wait, what? I wrote about this briefly a couple years ago, but the level of interest for the project, I must say, took me somewhat by surprise. So let’s talk about compiling Rust to C a little more today. Barriers to Rust adoption Rust is making big progress in terms of adoption, and represents a great value proposition, especially for new code. Both my former employer and my new employer, like pretty much everyone else these days, have big projects that are written in pure Rust or can have Rust components. Even Windows kernel drivers can be written in Rust now. Amazing stuff. However, if your project is, say, an open-source library that gets compiled on a wonderfully diverse set of target architectures, OSes, distributions and toolchains, well, chances are……