Question 1

How do I build a static Rust binary with musl?

Accepted Answer

Use the Docker image with 'docker run -v $(pwd):/home/rust/src ekidd/rust-musl-builder cargo build --release'. It handles static linking for libraries like OpenSSL and libpq automatically.

Question 2

rust-musl-builder vs cross: which is better?

Accepted Answer

rust-musl-builder is specialized for OpenSSL and diesel dependencies, but cross supports more platforms and is actively maintained. For modern projects without OpenSSL, cross is often preferred.

Question 3

Does rust-musl-builder work with rustls?

Accepted Answer

No, it's optimized for OpenSSL. The README recommends switching to rustls and using cross for compilation, as rustls is now well-supported in the Rust ecosystem.

Question 4

How to cache builds to speed up rust-musl-builder?

Accepted Answer

Mount volumes for .cargo/git, .cargo/registry, and target, then run 'sudo chown -R rust:rust' on them, as detailed in the caching section. This avoids re-downloading dependencies.

Question 5

Setting up diesel with PostgreSQL in rust-musl-builder?

Accepted Answer

Add diesel with postgres features to Cargo.toml, include openssl, and order extern crate statements in main.rs to prevent linker errors, following the specific instructions in the README.

Question 6

Is rust-musl-builder still maintained or updated?

Accepted Answer

The README indicates it's not actively maintained, with updates rare since rustls reduced the need for OpenSSL. Consider alternatives like cross for current projects.

rust-musl-builder

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