December 6, 2025
Rust speaks C. Internet freaks out
Eurydice: a Rust to C compiler (yes)
Rust code turned into C so old gear can run it — cheers, groans, and memes
TLDR: Eurydice converts Rust code into C so projects can run on older or unusual systems while keeping Rust as the main source. The crowd is split between “smart bridge for real-world users” and “why bother,” with prior-art links and toolchain gripes fueling the drama.
Rust-to-C? Internet double-take. Eurydice promises to turn modern, safety-loving Rust into plain old C so cranky legacy systems and obscure compilers can still run your code. Fans call it a bridge for real-world holdouts; skeptics ask why on earth you’d funnel safe code into the language of footguns. The top vibe is split: curious excitement vs existential side-eye. One camp loves the idea of porting to Rust while auto-spitting out C for ancient targets and corporate policies. The other camp is like, “Cool trick, but… why?” Prior-art spotters crash in with receipts: rustc_codegen_clr and mrustc, suggesting this isn’t the first rodeo. Meanwhile, toolchain drama flares: the docs recommend Nix (a package manager/build tool), prompting a weary sigh that Cargo—Rust’s one-click-friendly tool—“has spoiled” people. The spiciest take? A grim prophecy that C will outlive Rust by a lot, turning the thread into a miniature programming history war. Through it all, Eurydice’s practical pitch wins quiet nods: keep one Rust codebase, ship C for the stragglers, and count who still can’t switch. The meme energy? “Compile Rust to C so your 2009 router and your grandpa’s microwave can finally do crypto.”
Key Points
- •Eurydice is a Rust-to-C compiler designed to produce readable C code for legacy and unsupported environments.
- •It enables a single-source strategy: Rust remains authoritative while C is automatically derived, often via CI.
- •Eurydice integrates at the Rust MIR level using Charon to maintain faithful semantics and reduce translation complexity.
- •The project showcases outputs (e.g., compiling libcrux) with test results under version control to illustrate readability.
- •Technical tasks include whole-program monomorphization, translating pattern matches to tagged unions, recognizing iterator patterns for C for-loops, and handling array repeat expressions.