Let Cargo track CLIPPY_ARGS

[ghost]

This PR makes clippy-driver emit CLIPPY_ARGS in its dep-info output.

Just like #6441, this allows this workflow to work:

cargo clippy # warning: empty `loop {}` wastes CPU cycles
cargo clippy -- -A clippy::empty_loop # no warnings emitted

But without rebuilding all dependencies.

cc https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/CLIPPY_ARGS.20is.20not.20tracked.20by.20Cargo/near/228599088

changelog: Cargo now re-runs Clippy if arguments after -- provided to cargo clippy are changed.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @phansch (or someone else) soon.

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[phansch]

Thank you for the PR, the dogfood test changes look good to me! However, given our history with driver changes and my lack of knowledge here, I'd like to get a second pair of eyes on this.

Maybe r? @flip1995

[flip1995]

Local testing didn't lead to any obvious problems with this, so I'm happy to merge this. But we should revisit the placement of the depinfo change, which will most likely require a rustc change.

@bors r=phansch,flip1995,oli-obk

[bors]

📌 Commit 3cd5f44 has been approved by phansch,flip1995,oli-obk

[bors]

⌛ Testing commit 3cd5f44 with merge 3dc2a58...

[bors]

💔 Test failed - checks-action_test

[flip1995]

@bors retry

[bors]

⌛ Testing commit 3cd5f44 with merge d0d5232...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: phansch,flip1995,oli-obk
Pushing d0d5232 to master...

[ghost]

But we should revisit the placement of the depinfo change, which will most likely require a rustc change.

Should I open a https://github.com/rust-lang/rust issue for this?

[flip1995]

Yeah, I think that would be good 👍