Rust GCC Code Generator "rustc_codegen_gcc" Can Now Bootstrap Rustc

Written by Michael Larabel in Programming on 2 April 2022 at 08:00 AM EDT. 122 Comments
A huge milestone has been reached in the rustc_codegen_gcc effort that aims to offer a GCC-based Rust compiler alternative to the LLVM-based official Rust compiler.

The rustc_codegen_gcc project that builds upon libgccjit for offering ahead-of-time code generation for Rustc is now able to finally bootstrap Rustc itself!

Thanks to the latest work on rustc_codegen-gcc, it can successfully compile rustc itself. That resulting rustc compiler was then working enough at least to compile a simple Rust "Hello World!" program. While an exciting milestone, much work still lays ahead including around SIMD support and other optimizations.

The hope with rustc_codegen_gcc is that it will be able to take advantage of GCC's more diverse CPU architecture / platform support compared to LLVM with the official Rust compiler. It will also be interesting from the performance aspect with how this implementation and GCC's different optimizations compare. Plus some just preferring GCC over LLVM based compilers for code licenses and other aspects.

The latest rustc_codegen_gcc report can be read here by developer Antoni Boucher.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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