Build with musl (similar to rust-musl-cross )

[igor-hnizdo]

It would be nice if this package could build with musl instead of glibc.

Musl has the upside that it produces static library, always.

Rust has these docker images/repo

https://github.com/messense/rust-musl-cross
https://hub.docker.com/r/messense/rust-musl-cross/

which is based on this repo

https://github.com/richfelker/musl-cross-make

The nice thing is - you can actually steal this work very easily. :) these rust repos have very little to do with actual rust; they install rust sure, but the main logic is the builds and cross-builds, which is already done.

---

I have been able to build with go+musl myself like this:

Dockerfile:

FROM messense/rust-musl-cross:aarch64-musl AS go-arm64-musl
COPY --from=golang:1.19.1 /usr/local/go/ /usr/local/go/
#that's it... I just "steal" the rust image for go purposes

Bash script to run:

CGO_ENABLED=1 CC="/usr/local/musl/bin/aarch64-unknown-linux-musl-gcc" GOARCH=arm64 \
    go build --ldflags '-linkmode external -extldflags "-static" -extld /usr/local/musl/bin/aarch64-unknown-linux-musl-gcc' \
    -o <output here>

This will use musl and build arm64 static library. I am actually not sure if the extldflags "-static" is necessary or not :)

Note that it works on both ARM and AMD64 host PC, as the rust base images are built for both ARM and AMD64.