Shameless self-plug: https://github.com/zdimension/embed-c https://github.com/zdimension/embed-c This transpiles C to Rust at compile time, though it requires

Shameless self-plug: https://github.com/zdimension/embed-c https://github.com/zdimension/embed-c This transpiles C to Rust at compile time, though it requires a nightly compiler and hasn't been updated in some time. But it's exactly what you're looking for. C code in, unsafe Rust code out.