Config build.rustc-wrapper is unused.

[oberzs]

Problem

I added build.rustc-wrapper = "sccache" to use the sccache in my builds, but when running any cargo command, it says that build.rustc-wrapper is an unused key.
I found the key in The Cargo Book (https://doc.rust-lang.org/cargo/guide/build-cache.html).

Steps

1. Install sccache cargo install sccache
2. Add build.rustc-wrapper = "sccache" to Cargo config ($CARGO_HOME/config)
3. Run cargo build in any project

Notes

Output of cargo version: cargo 1.40.0 (bc8e4c8 2019-11-22)

Rust version: 1.40.0
OS: Windows 10

[ehuss]

Thanks, this has already been fixed via #7575

[lebensterben]

Hi, I still see the error message on cargo 1.44.0-nightly.

[ehuss]

Hi, I still see the error message on cargo 1.44.0-nightly.

Can you show a sample config file that reproduces the issue and the text of the warning? I can't seem to reproduce it.

[lebensterben]

@ehuss
I installed sccache with cargo install sccache, and have these contents in my ~/.cargo/config file:

[build]
rustc_wrapper = "sccache"

[expand]
theme = "Monokai Extended Origin"

where sccache is in the $PATH, I've also tried setting it to it's absolute path.

Then, when I run cargo build, cargo test, or cargo clippy, I always see the unused config key in build.rustc_wrapper warning.

[ehuss]

It should be rustc-wrapper with a dash, not an underscore.

[lebensterben]

It should be rustc-wrapper with a dash, not an underscore.

@ehuss You're right! Thanks.