feat: support rustflags per profile by zhamlin · Pull Request #10217 · rust-lang...
source link: https://github.com/rust-lang/cargo/pull/10217
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I think it would be good to also talk about how this works with rustdocflags. If there are flags that are required for correctness, then cargo test --doc would fail. I'm not suggesting that this should add rustdocflags, though. Just to consider what the impact will be.
I'm a little nervous adding this, as it is a very low-level thing which we haven't exposed in Cargo.toml before. One of my biggest concerns is that it can cause backward-compatibility hazards. For example, when Cargo adds new features or changes the way it invokes rustc, that can interfere with pre-existing flags. In a sense, this seems to be an end-run around Cargo not exposing the workflows that users want.
I'm not concerned enough to block it, as I can see its utility. However, I think we should tread very carefully.
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