I've noticed that Rust uses LLVM as well, but aren't there some significant compile time differences or am I recalling that from Go?
I do definitely wish there was an easier way to go about Rust's C FFI, though. LuaJIT has spoiled me. All you do is preprocess headers and then you have access to all of the exports without having to do any work whatsoever.
Go is the language with very fast compile times; Rust's aren't particularly good, and, depending on the exact details, maybe slower than C++'s. It's pretty variable. We've been working on it but it's non-trivial.
There are tons of tools in Rust to preprocess headers, and do even more fun things like https://github.com/Hywan/inline-c-rs (which is obviously not a general solution to this problem but is interesting)
