rust-musl-cross VS cross

Is my best bet just to use (rust-musl-cross)[https://github.com/messense/rust-musl-cross] as the builder image?

rust-musl-cross: active as last commit was 10 days ago. It said it based on rust-musl-builder. But this repo was created years ago. So why would this exist when there is also rust-musl-builder. What are the differences compared to rust-musl-builder and muslrust?

The example that is provided in the AWS Rust runtime repository shows them using a custom linker and rustup target in order to cross-compile for x86-based lambdas. I attempted to dive into how to get a arm64-based linker, but in the process of trying to figure out how to get that linker installed locally (no convenient packages for Ubuntu, sorry), I stumbled across a project that provides cross-compilation tooling for various platforms via Docker. That made my life a lot easier - Using the rust-musl-cross Docker container, all I have to do is wrap the call to cargo build, and it builds for the proper architecture:

To compile a program with musl on a glibc system you can use cross-rs!

I cross compile to Mac, bsd, windows, etc cross ... Works great for me with either docker or podman.

If docker is available for you, https://github.com/cross-rs/cross is another and reliable way to solve this kind of problem. I do use it regularly.

We are using https://github.com/cross-rs/cross.

There is some built-in support in rustc for cross-compiling, but getting the build to actually work can be tricky due to the need for an appropriate linker. Instead, we’re going to use the Cross crate, which used to be maintained by the Rust Embedded Working Group Tools group.

I have used cross before to cross compile from Linux to other Linux. It has a section on it's wiki about this. Maybe that could be of help.

You can use cross to build your application and copy the artifacts into an alpine armv7 container. It would also build faster due to using cross compilation rather than QEMU.

Looks like cross is the easiest way to get something cross-compiled but its Mac support is blocked behind building your own build image. Even that repo says that it might be broken.

Bonus: if you’re working with Rust and doing a lot of cross platform stuff, check out cross. It runs QEMU in docker so you can run tests on a bunch of different emulated targets easily- literally a one line setup, it’s kind of magical.

It's also not as naturally cross-compilable as Go, though that's partly a side-effect of not accepting being a semi-closed ecosystem to achieve that and cross exists as a stop-gap while things like cargo-zigbuild explore less drastic options.