Beta 1.54 backports #9611
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Beta 1.54 backports #9611
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Change `rustc-cdylib-link-arg` error to a warning. In rust-lang#9523, an error was added if `cargo:rustc-cdylib-link-arg` was issued in a build script without actually having a cdylib target. This uncovered that there was an unintentional change in rust-lang#8441 to cause those link args to be applied to transitive dependencies. This changes it so that the error is now a warning, with a note that this may become an error in the future. It also changes it so that the unstable `rustc-link-arg*` instructions only apply to the package that emitted them.
…alexcrichton Relax doc collision error. rust-lang#9526 moved the `cargo doc` output name collision code to be shared with the other collision detection code. However, the way it detected collisions wasn't quite the same, and started generating errors for situations that were just warnings before. It was intended that the code should behave the same, so this PR relaxes the checks to be more like the original code. (It's still not 100% the same, but should be close enough.) Closes rust-lang#9564
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Disambiguate is_symlink. `Path::is_symlink` was added in rust-lang/rust#85747 which triggers the `unstable_name_collisions` lint, breaking Cargo's CI. This switches it to a free function to avoid the collision.
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This backports the following changes to 1.54 beta:
rustc-cdylib-link-argerror to a warning. #9563 — Change rustc-cdylib-link-arg error to a warning. Validation was added in Add some validation to rustc-link-arg #9523 (1.54) that generated an error. However, it was unknown at the time that use of link args via dependencies was being used. Rather than regress those projects (which has been on stable since 1.50), this switches the validation to a warning to indicate this was not intended.