Please provide rustup wrapper rust-rr, like rust-gdb but for rr

[ijackson]

I would like to use rr (the time travelling debugger) with Rust.

I found the following resources:

1. https://rr-project.org/ contains instructions on using rr
2. rustup's rust-gdb wrapper, which seems from looking at strace to do some gdb configuration
3. https://gist.github.com/spacejam/15f27007c0b1bcc1d6b4c9169b18868c https://gist.github.com/spacejam/0ec039d4b3bb0ac976245975de8f3a25 gists on how to use rust with rr, and with rust pretty printers.

I'm not sure precisely how the information/configuration from these sources should be combined, particularly given that the behaviour of rust-gdb is rather opaque (see #2532). Probably some experimenting would determine the right combination of things, and then we could have a rust-rr wrapper.

[kinnison]

The rust-gdb wrapper is provided from the https://github.com/rust-lang/rust project in the compiler component. Nominally the best way to get this resolved would be to get the wrapper into the compiler repo and exported into the channel components. From there we can add a proxy wrapper in rustup and then we're connected end-to-end. Short-term if you've managed to record with a plain rr record target/debug/blah then you might get away with env RUST_GDB="rr replay" rust-gdb

[kinnison]

@rust-lang/compiler I'm not sure if you're quite the right team to ping, but what do we think about providing a rust-rr wrapper which then we could provide a rustup proxy for?