Comments (3)
weihanglo
commented on June 27, 2024
1
This is expected, as documented in the Cargo Contributor Guide.
But when cargo is not run via rustup, the toolchain may change based on the directory. Since Cargo changes the directory for each compilation, this can cause different calls to rustc to use different versions.
You can see under ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ff-0.13.0/rust-toolchain the ff crate has a quite old MSRV. It doesn't recognize a relatively new --diagnostic-width option from rustc.
The contributor guide also provides some workaround already. Setting RUSTC or RUSTUP_TOOLCHAIN might be good alternatives.
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heisen-li
commented on June 27, 2024
@rustbot label +Command-install +A-building-cargo-itself
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weihanglo
commented on June 27, 2024
This is a gnarly problem that rustup and cargo are not a single binary, so Cargo doesn't know if it belongs to a toolchain. I don't think it is fixable at this moment, but leave this open for future reference.
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