Switching to Rust's own mangling scheme on nightly
2 days ago
- #Rust
- #Compiler
- #Symbol-Mangling
- Rust's compiler will switch to its own 'v0' symbol mangling scheme by default starting from nightly-2025-11-21.
- The previous default used C++'s mangling scheme, which had several drawbacks including loss of generic parameter information and platform incompatibility.
- The new 'v0' mangling scheme provides unambiguous encoding, reversible generic parameter information, and better compatibility with tools.
- Benefits include improved readability in backtraces, especially for async code, closures, and generic functions.
- Possible drawbacks include slightly larger symbol sizes, potentially increasing linking times and binary sizes.
- The legacy mangling scheme can still be used with the `-Csymbol-mangling-version=legacy -Zunstable-options` flag if needed.
- Tools interacting with Rust symbols can integrate the v0 demangler from the rust-lang/rustc-demangle repository.