rustc_codegen_gcc

There are at least two efforts that support Rust with GCC (a rustc codegen backend that uses libgccjit for AOT compilation, and a GCC frontend that parses Rust). https://lwn.net/Articles/871283/ https://github.com/Rust-GCC/gccrs https://github.com/antoyo/rustc_codegen_gcc

It's true that if this project succeeds, that would be an outcome, but it's probably worth noting that you'd really only have to add support for the GCC backend to do that, and not reimplement the frontend as well (parsing, type checking, lifetime checking, etc.). There's an unrelated project working to do that: https://github.com/antoyo/rustc_codegen_gcc that would likely yield those same benefits for less effort.

As I understand it, rustc_codegen_gcc [1], which is being merged into mainline rustc [2], supports building for MIPS. [1] https://github.com/antoyo/rustc_codegen_gcc [2] https://github.com/rust-lang/rust/pull/87260 Can you give it a try?

It is impressive work but I still think that using libgccjit as a backend is the right way forward since once it has been integrated it should be much less work to maintain. https://github.com/antoyo/rustc_codegen_gcc

Some links on the most promising effort so far, gccrs https://opensrcsec.com/open_source_security_announces_rust_g... https://www.embecosm.com/2021/01/12/gcc-rust-how-it-can-be-a... https://rust-gcc.github.io/ This is an entirely new frontend written in C++, that shares no code with rustc (the official rust compiler). It might be merged some day in GCC proper. But honestly, I'm more excited for rustc_codegen_gcc: https://github.com/antoyo/rustc_codegen_gcc It adds gcc as an alternative backend of the official Rust compiler. That way it is much more feasible to stay up to date as the language evolves. Anyway the former two don't actually work right now. The one that does work today is mrustc, or at least it works for bootstrapping rustc; it doesn't have a borrow checker though (and instead assumes the program is correct). Also, mrustc isn'

Your comment is the only search result for rust_codegen_gcc I can find on the Internet. Care to share a link? EDIT: Ah, found lower in the thread: https://github.com/antoyo/rustc_codegen_gcc. The missing c was enough to make it not show up in searches.

> The project is still in an early phase with the goal to compile the offical Rust test suite. There are no immediate plans for a borrow checker as this is not required to compile rust code and is the last pass in the RustC compiler. This is essentially a reimplementation of rustc. I'm not going to say "don't boil the ocean" but it will likely be a while before this is at feature parity with the main compiler. Even with a full-time developer. There is a project to use gcc as a backend for rustc, which might be a more tractable option to removing the llvm dependency in the short term: https://github.com/antoyo/rustc_codegen_gcc

FTR, there are some efforts to integrate GCC & Rust: https://github.com/antoyo/rustc_codegen_gcc https://github.com/Rust-GCC/gccrs https://github.com/sapir/gcc-rust/

> For other architectures, the goal is to get gccrs moving forward and merged upstream: I would much rather see rustc_codegen_gcc upstreamed: https://github.com/antoyo/rustc_codegen_gcc A GCC backend for rustc would provide all the code generation of GCC without duplicating the Rust frontend.

There is another project for implementing a GCC backend for Rust which instead uses the libgccjit API. https://github.com/antoyo/rustc_codegen_gcc