A few years ago, the only way to compile Rust code was using the rustc compiler with LLVM as a backend. Since then, several projects, including

Mutabah's Rust Compiler (mrustc), GCC's Rust
support (gccrs),

rust_codegen_gcc, and

Cranelift have made enormous progress
on diversifying Rust's compiler implementations. The most recent such project,

Eurydice, has a
more ambitious goal: converting Rust code to clean C code. This is especially useful in high-assurance software, where existing verification and compliance tools expect C. Until such tools can be updated to work with Rust, Eurydice could
provide a smoother transition for these projects, as well as a stepping-stone for environments that have a C compiler but no working Rust compiler. Eurydice has been used to compile some post-quantum-cryptography routines from Rust to C,
for example.

https://lwn.net/Articles/1055211/
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