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How to cross compile tedge using zig
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tedge-cross-compile-with-zig.md

How to cross compile a rust project using zig? wtf.

I was able to compile and cross compile the gnu and musl variants to all of our target triples :)

  1. Install the cargo-zigbuild and dependencies (requires python3)

    pip3 install ziglang
cargo install cargo-zigbuild

  2. Cross compiling for all musl variants

    musl

    rustup target add x86_64-unknown-linux-musl
cargo zigbuild --target x86_64-unknown-linux-musl

rustup target add aarch64-unknown-linux-musl
cargo zigbuild --target aarch64-unknown-linux-musl

rustup target add armv7-unknown-linux-musleabihf
cargo zigbuild --target armv7-unknown-linux-musleabihf

rustup target add arm-unknown-linux-musleabihf
cargo zigbuild --target arm-unknown-linux-musleabihf

    gnu

    rustup target add x86_64-unknown-linux-gnu
cargo zigbuild --target x86_64-unknown-linux-gnu

rustup target add aarch64-unknown-linux-gnu
cargo zigbuild --target aarch64-unknown-linux-gnu

rustup target add armv7-unknown-linux-gnueabihf
cargo zigbuild --target armv7-unknown-linux-gnueabihf

rustup target add arm-unknown-linux-gnueabihf
cargo zigbuild --target arm-unknown-linux-gnueabihf

Working hosts

The following hosts were able to succesfully build/compile the above targets.

  • MacOS M1 (aarch64) natively
  • MacOS M1 (aarch64) in arm64 debian container
  • Linux (x86_64) GitHub Runner (ubuntu-20.04)

What didn't work

It seems that arm 32 bit targets don't work so well due to some compile issues with the ring dependency. The following targets failed to compile:

  • armv5te-unknown-linux-musleabi
  • armv5te-unknown-linux-gnueabi
  • arm-unknown-linux-musleabi
  • arm-unknown-linux-gnueabi

Troubleshooting tips

Compile errors when building on MacOS M1 native

I ran into an initial problem building natively on MacOS M1. It turned out that there was a conflict between homebrew installed rust package and the rust version installed via rustup. Solution was to uninstall the homebrew rust package.

Fix was provided by this post.

References

@didier-wenzek
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Thanks for this! It works like a charm!

@reubenmiller
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Author

Adding some other references
https://users.rust-lang.org/t/costs-of-using-zig-linker/88525

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