Fix unit_for computation on proc-macros in shared workspace. #9059
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r? @Eh2406 (rust-highfive has picked a reviewer for you, use r? to override) |
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The explanation makes sense, the code passes tests, and the code looks good. But I will let Alex look it over as I do not have a good understanding of the context. |
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@bors: r+ |
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📌 Commit a846898 has been approved by |
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☀️ Test successful - checks-actions |
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Update cargo 10 commits in 329895f5b52a358e5d9ecb26215708b5cb31d906..a73e5b7d567c3036b296fc6b33ed52c5edcd882e 2021-01-06 00:01:52 +0000 to 2021-01-12 23:45:39 +0000 - Sort available binaries when multiple (rust-lang/cargo#9066) - Fix misspelling of environment variable (rust-lang/cargo#9067) - Remove statement that opt-level 0 turns on debug (rust-lang/cargo#9070) - Fix `links` vars showing up for testing packages (rust-lang/cargo#9065) - Fix unit_for computation on proc-macros in shared workspace. (rust-lang/cargo#9059) - Document `could not find the github team` error on `cargo owner --add` (rust-lang/cargo#9000) - Unstable section of cargo/config.toml takes bools (rust-lang/cargo#9057) - [doc] add note about empty environment variables for missing manifest keys (rust-lang/cargo#9053) - another round of clippy lint fixes (rust-lang/cargo#9051) - Updated display message of cargo metadata --help (rust-lang/cargo#9050)
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There was a bug where the UnitFor was not being computed properly for proc-macros in a workspace with shared dependencies, integration tests, and a mixture of various flags (
--workspace --all-targets --all-features). The issue is that this line, which is used when attaching the implicit dependency from an integration test to its library, was using the wrong unit_for value (it was not checking if the implicit lib is a proc-macro). The consequence is that the graph could be built inconsistently, causing features to be randomly selected incorrectly if the integration test happened to be the first unit processed.The solution here is to use a common function for transitioning the unit_for value. The with_for_host/with_host_features split was mostly a consequence of how things evolved over time, and keeping them separate wasn't really necessary.