Cross compilation

We cross-compile the resolc.js frontend executable to Wasm for running it in a Node.js or browser environment.

The musl target is used to obtain statically linked ELF binaries for Linux.

Wasm via emscripten

The REVIVE_LLVM_TARGET_PREFIX environment variable is used to control the target environment LLVM dependency. This requires a compatible LLVM build, obtainable via the revive-llvm build script. Example:

# Build the host LLVM dependency with PolkaVM target support
make install-llvm
export LLVM_SYS_181_PREFIX=${PWD}/target-llvm/gnu/target-final

# Build the target LLVM dependency with PolkaVM target support
revive-llvm emsdk
source emsdk/emsdk_env.sh
revive-llvm --target-env emscripten build --llvm-projects lld
export REVIVE_LLVM_TARGET_PREFIX=${PWD}/target-llvm/emscripten/target-final

# Build the resolc frontend executable
make install-wasm
make test-wasm

musl libc

rust-musl-cross is a straightforward way to cross compile Rust to musl. The Dockerfile is an executable example of how to do that.