mold 3.0.0 is a new major release of the high-speed linker. As we announced in the 2.42.1 release notes, we have rewritten mold from C++ to Rust, and this is the first release of the Rust version. ...
We are rewriting mold from C++ to Rust, and 2.42.1 is likely to be the last C++ version of the linker unless we need to make another patch release. The Rust version of mold will be released as mold 3.0. A tool like mold needs to be developed with the expectation that it may remain in use for decades. Given that expected lifespan, mold is still relatively early in its life, and we believe that rewriting it in Rust at this point is the right decision.
OK well I found the rewrite to Rust part interesting:
https://github.com/rui314/mold/releases/tag/v2.42.1
https://news.ycombinator.com/item?id=49963385
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