The author describes the challenges of syncing the Rust GCC backend (rustc_codegen_gcc) repository with the main Rust compiler repository using git subtree, a feature that doesn't work well with large repositories. The synchronization process encountered significant issues, ultimately taking two months to resolve, serving as a cautionary tale about Murphy's law in compiler infrastructure maintenance.
Background
The Rust GCC backend is an experimental code generator for the Rust compiler that allows Rust to be compiled using GCC instead of LLVM. It lives in a separate repository that needs regular synchronization with the main Rust compiler repository.
- Source
- Lobsters
- Published
- Sep 28, 2026 at 08:10 AM
- Score
- 5.0 / 10