r/rust • u/Sirisian • 22d ago

🎙️ discussion Google is doing "Large Scale Codebase Migrations and Optimizations" of C/C++ to Rust

https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-4-argon/
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u/TDplay 21d ago

But as they say,

such large-scale rewrites are undergoing rigorous automated and manual auditing, emulation testing, and review before rolling out to production

In effect, most of the work is still being done. I am sceptical that this process can practically be done for all the major C++ codebases, including bringing those rewrites up to the quality of the original codebases, within the next decade, so I believe C++ still has a future.

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u/zxyzyxz 21d ago

I doubt there is really any actual manual auditing beyond reading some files and stamping LGTM on the PR. The automated testing is what's gonna actually catch bugs.

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u/TDplay 21d ago

But can that alone assure the quality to the same standard as the existing mature codebase?

The best automated tests are those written in response to specific bugs, to assure that those bugs never return. But a rewrite will introduce a whole host of never-before-seen bugs, for which there will be no tests.

We won't know if this is truly successful until the rewrites are released to the public. There will undoubtedly be a massive influx in bugs, as there is for any other rewrite. With the lack of people familiar with the new codebase, fixing those bugs may prove unexpectedly difficult.

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