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Add WebAssembly build instructions #25

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Nov 9, 2023
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Add WebAssembly build instructions #25

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29 changes: 29 additions & 0 deletions README.md
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Expand Up @@ -205,6 +205,35 @@ For more detailed documentation of all available options and functionality, visi

## Building

### Compiling MiniZinc for WebAssembly

The WebAssembly build of MiniZinc requires [Emscripten](https://emscripten.org/).

```sh
# Clone MiniZinc
git clone https://github.com/MiniZinc/libminizinc minizinc

# Download solvers (or you can build them yourself using emscripten)
cd minizinc
MZNARCH=wasm ./download_vendor

# Configure MiniZinc
emcmake cmake -S . -B build \
-DCMAKE_FIND_ROOT_PATH="/" \
-DCMAKE_BUILD_TYPE=Release \
-DGecode_ROOT="$PWD/vendor/gecode" \
-DOsiCBC_ROOT="$PWD/vendor/cbc" \
-DCMAKE_PREFIX_PATH="$PWD/vendor/highs/lib/cmake/highs:$PWD/vendor/chuffed/lib/cmake/chuffed" \
-DCMAKE_INSTALL_PREFIX="../minizinc-install"

# Build MiniZinc
cmake --build build --config Release --target install
```

The WebAssembly build of MiniZinc can also be obtained from the [build workflow](https://github.com/MiniZinc/minizinc-js/actions/workflows/build.yml) as the `minizinc` artifact.

### Building MiniZinc JS

1. Run `npm install` to install dependencies.
2. Place the `bin/` folder of the WebAssembly build of MiniZinc inside this directory.
Alternatively set the `MZN_WASM_DIR` environment variable to the installation directory of the
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