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    My biggest problem is slow linking. Even if I only change a single file, I have to wait 5-10 seconds just for the linker. I was excited to try out faster lld linking, but none of the recommended lines worked (on x86_64-pc-windows-gnu).

    The RUSTFLAGS failed with

    error: failed to run `rustc` to learn about target-specific information
    
    Caused by:
      process didn't exit successfully: `rustc - --crate-name ___ --print=file-names "\"-C" "link-arg=-fuse-ld=lld\"" --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg` (exit code: 1)
      --- stderr
      error: multiple input filenames provided (first two filenames are `-` and `"-C`)
    

    Looks like there’s some escaping stuff going on when you do it on Windows.

    The Cargo.toml flags failed with unused manifest key warnings:

    warning: unused manifest key: target.x86_64-pc-windows-gnu.linker
    warning: unused manifest key: target.x86_64-unknown-linux-gnu.linker
    

    Not sure if I’m doing anything wrong or if the guide recommends things that weren’t tested at all.

    (EDIT: The tutorial is wrong. These keys have to be added to config.toml, not Cargo.toml. Now it cannot find lld but that’s already progress.)