Tracking Issue for trim-paths RFC 3127

[ehuss]

Summary

RFC: #3127
Documentation: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#profile-trim-paths-option
Issues: Z-trim-paths Nightly: path sanitization
rustc tracking issue: rust-lang/rust#111540

This adds a new profile setting (among other things) to control how paths are sanitized in the resulting binary.

Unresolved Issues

• Should make --remap-path-prefix work with rustdoc and doctest?
  • Yes as rustdoc supports both
    • rustdoc: Add support for --remap-path-prefix rust#107099
    • Fix rustdoc missing handling of remap-path-prefix option rust#128736
  • Integrate --remap-path-prefix in rustdoc invocations (cargo doc) feat(trim-paths): rustdoc supports trim-paths for diagnostics  #14389
  • Integrate --remap-path-prefix and -Zremap-path-scope in doctest (cargo test --doc)
• Determine the remap rules: trim-paths: Remap rules for different dependency kinds #13171
  • A cross-platform stable hash for CARGO_HOME layout? feature(SourceId): use stable hash from rustc-stable-hash #14917
    • On Windows the local path contains prefix component e.g.C:/, which essentially results in a different hash result from what on other platforms. This is unlikely to be resolved.
    • benchmark BLAKE3, BLAKE2s, and rustc-stable-hasher
      • See result in feat!: use stable hash from rustc-stable-hash #14116 (comment)
      • rustc-stable-hash is on par with the original siphash, while blake3 is 2-3x slower. The total spent in stable hashing for a cargo build invocation may be unimportant. It took 500μs-1500μs for buidling cargo itself.
• There should be some tests for Windows and macOS
  • Be sure to consider the impact of back versus forward slashes, and whether or not that will work with either.

Future Extensions

No response

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Implementation history

• feat: implement RFC 3127 -Ztrim-paths #12625
• feat(trim-paths): set env CARGO_TRIM_PATHS for build scripts #12900
• fix: merge trim-paths from different profiles  #12908
• feat(trim-paths): rustdoc supports trim-paths for diagnostics  #14389
• refactor: use Path::push to construct remap-path-prefix #14908