I'm not sure it's possible to get the version of the compiler a Rust binary was built with after compilation. At most we could try to include that statically in the binary.

Running rustc -vV in the panic handler isn't a super great idea in my opinion because it assumes that the user of a tool even has Rust installed and it also only really gives useful diagnostics if they compiled the tool themselves instead of pulling it from a binary package (or similar).

You might want to take a look at what build info the sentry crate gathers: https://github.com/getsentry/sentry-rust/blob/8dbda94b81b6efd92dfd9cfffb25414cffdaee17/build.rs

Oh, interesting - looks like we could add a build script to this crate, and use https://crates.io/crates/rustc_version to include the version! Nice one @killercup.

I'm working on integrating a similar build script into clippy right now, once that's done I'm happy to attempt the same here 👍

ping @phansch did you ever finish the build script so we can steal it? 🙂

Oh, I didn't end up doing it in the end and Clippy is available on stable now. I think using the build.rs from sentry should work out of the box: https://github.com/getsentry/sentry-rust/blob/master/build.rs

It generates a constants.gen.rs with RUSTC_VERSION, RUSTC_CHANNEL, PLATFORM and ARCH constants. You should then be able to use i.e. constants::RUSTC_VERSION when you generate the report.