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WASM_BUILD.md

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Building WASM binary

Setting up the environment

To build WASM binary from source, the following prerequisites are required:

  1. Install wasm-pack 
    cargo install wasm-pack
  2. OSX specific: install llvm 
    brew install llvm

Compiling WASM release binary

To build WASM release binary run one of the following commands according to your environment:

  • for Linux users: 
    wasm-pack build mm2src/mm2_bin_lib --target web --out-dir wasm_build/deps/pkg/
  • for OSX users (Intel): 
    CC=/usr/local/opt/llvm/bin/clang AR=/usr/local/opt/llvm/bin/llvm-ar wasm-pack build mm2src/mm2_bin_lib --target web --out-dir wasm_build/deps/pkg/
  • for OSX users (M1): 
    CC=/opt/homebrew/opt/llvm/bin/clang AR=/opt/homebrew/opt/llvm/bin/llvm-ar wasm-pack build mm2src/mm2_bin_lib --target web --out-dir wasm_build/deps/pkg/

Please note CC and AR must be specified in the same line as wasm-pack test mm2src/mm2_main.

Compiling WASM binary with debug symbols

If you want to disable optimizations to reduce the compilation time, run wasm-pack build mm2src/mm2_bin_lib with an additional --dev flag:

wasm-pack build mm2src/mm2_bin_lib --target web --out-dir wasm_build/deps/pkg/ --dev

Please don't forget to specify CC and AR if you run the command on OSX.