Wrong Nightly version used for macros / build scripts

[luxalpa]

I have set my toolchain via rust-toolchain.toml to nightly-2025-04-17. This works with cargo build, but cargo clif build seems to be using a different version (I don't know which one) for the build scripts / macros.
Edit: It's using nightly-2025-04-14-x86_64-pc-windows-msvc for some reason. I uninstalled all the other nightly versions and then it went and automatically installed this one. I am guessing it takes this from the rust-toolchain.toml in rustc_codegen_cranelift itself for some reason?

I am getting the error:

no method named file found for struct proc_macro::Span in the current scope

... which is due to a recent nightly change (I think in 2025-04-15 ?), so it must be using an older nightly version.

Proc macro code:

#![feature(proc_macro_span)]

#[proc_macro]
pub fn my_macro(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    input
}

fn some_fn(span: proc_macro::Span) {
    span.file();
}

I am on Windows 11.

[bjorn3]

cargo-clif indeed ignores rust-toolchain.toml. It has to because every cg_clif build links against a single rustc version. If you need a specific nightly rustc, you can use instructions from https://github.com/rust-lang/rustc_codegen_cranelift?tab=readme-ov-file#download-using-rustup instead of downloading a release from this repo and using cargo-clif. This will get you a cg_clif build exactly matching the specific nightly you installed.

[luxalpa]

ahh ok, thanks, that kinda makes sense. Unfortunately those seem to be Linux / Mac only though.

[bjorn3]

Right, you are running on Windows. Unfortunately there are still some ABI compatibility issues between cg_clif and cg_llvm that are preventing rustup distribution of cg_clif. (rustup distributed cg_clif uses a cg_llvm compiled standard library) If using nightly-2025-04-21 would work for you too, then updating to the latest release of cg_clif should work. I updated cg_clif to the latest nightly a couple of hours ago.