Unable to build statically using an alpine image

[lielfr]

Hi,
I'm trying to statically embed Ruby within a Rust project using magnus, and it seems like I cannot get it to build using an alpine image.
I'm using Docker on M1, using the following Dockerfile:

FROM rust:alpine AS builder

RUN apk add musl-dev ruby clang17-static llvm17-static clang17-libclang

WORKDIR /usr/src/myapp

COPY . .

RUN cargo install --path .

FROM scratch

COPY --from=builder /usr/local/cargo/bin/myapp .

CMD ["myapp"]

My Cargo.toml looks like this:

[package]
name = "ruby-embed-test"
version = "0.1.0"
edition = "2021"

[dependencies]
magnus = { version = "0.7.1", features = ["embed"] }
rb-sys = { version = "*", default-features = false, features = ["ruby-static"] }

and the error I get is:

Unable to find libclang: "the `libclang` shared library at /usr/lib/llvm17/lib/libclang.so.17.0.6 could not be opened: Dynamic loading not supported"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: failed to compile `ruby-embed-test v0.1.0 (/usr/src/myapp)`, intermediate artifacts can be found at `/usr/src/myapp/target`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.`

I also tried to mess with the bindgen settings, but it seems like `rb-sys-build` uses the `runtime` feature, which is mutually exclusive with the `static` feature.

Is it possible to embed Ruby like this? Ideally, I would like to have just one self-contained binary (that can be used without glibc).

[ianks]

According to the clang-sys docs, looks like you may need to set LIBCLANG_STATIC_PATH or something, but I've never done this myself so I'm not sure.