rust-lang / rust-lang/rust-analyzer

Non-reproducible builds

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Dominant language
Rust
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Description

If I make two different copies of rust-analyzer, set them both to build with --remap-path-prefix by adding it to rustflags in .cargo/config, and build them with cargo xtask install, I see multiple differences in the output files, including librust_analyzer.rlib and a number of the rlibs in release/deps. Many of the rlib differences are non-obvious differences in rmeta files.

Now that this is part of the rustc tree, this affects rust-lang/rust#34902.

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Research direction

Reproduce the build from two copies using the rustflags entry in .cargo/config and cargo xtask install. Compare the output files, especially librust_analyzer.rlib and the rlibs under release/deps, then inspect the differing rmeta data. Done means equivalent builds produce identical output files when --remap-path-prefix is enabled.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
build-system
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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