I'm trying to build a PHP extension for Alpine Linux, which uses musl. My understanding is that I need to set my Cargo.toml to build a staticlib rather than cdylib in this case.

I'm running into issues with building ext-php-rs, I think the first issue is that bindgen is set to dynamically link libclang, which fails with "Dynamic loading not supported". It does appear from https://gitlab.alpinelinux.org/alpine/aports/-/issues/12226 that it's possible for bindgen to work with clang-static.

After cloning ext-php-rs and trying that, I am now getting an error:

  = note: /usr/lib/gcc/aarch64-alpine-linux-musl/10.3.1/../../../../aarch64-alpine-linux-musl/bin/ld: /root/.rustup/toolchains/stable-aarch64-unknown-linux-musl/lib/rustlib/aarch64-unknown-linux-musl/lib/libcompiler_builtins-182d699ce6400069.rlib(cpu_model.o): undefined reference to symbol 'getauxval'
          /usr/lib/gcc/aarch64-alpine-linux-musl/10.3.1/../../../../aarch64-alpine-linux-musl/bin/ld: /lib/libc.musl-aarch64.so.1: error adding symbols: DSO missing from command line
          collect2: error: ld returned 1 exit status

I'm a bit out of my depth with this though! If anyone else has tried or had experience with building for musl, and pointers would be much appreciated! Thanks