Using cargo clippy with -Z build-std produces warnings inside of libcore

[alex]

If you attempt to use cargo clippy with the new cargo support for building the standard libraries (obsoleting cargo-xbuild and xargo), clippy will emit tons of warnings inside of libcore.

Usage: cargo clippy -Z build-std=core,alloc --target=<anything>

You can see an example of this failing here: https://travis-ci.com/fishinabarrel/linux-kernel-module-rust/builds/128613174

[mati865]

Could you try using cargo clippy-preview? Probably you will also have to use -Z unstable-options.

[alex]

Yes, indeed with clippy-preview + -Z unstable-options this seems resolved.

[mati865]

It doesn't seem worth fixing then, soon cargo clippy will work just like cargo clippy-preview right now: rust-lang/cargo#7382

[alex]

Agreed.