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Cargo's Build Dir Shakeup: Test v2 Before It Hits Your Pipeline

Your cargo test just exploded thanks to -Zbuild-dir-new-layout. Cargo's rewriting its internals, and they're begging for your pain points before it goes default.

theAIcatchup Apr 07, 2026 3 min read
Side-by-side comparison of Cargo's old and new build directory layouts

⚡ Key Takeaways

  • Cargo's build dir v2 scopes artifacts by package/hash for cleaner, faster builds and unblocks workspace caching. 𝕏
  • Test now with -Zbuild-dir-new-layout—expect tool breakage, report to save your pipeline. 𝕏
  • Big wins ahead: granular locks, stale cleanup, but tooling maintainers face short-term pain. 𝕏
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#Cargo #build directory #nightly testing #open source testing

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Originally reported by Rust Blog

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