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71 lines
1.4 KiB
Markdown
71 lines
1.4 KiB
Markdown
# Python WebAssembly (WASM) build
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This directory contains configuration and helpers to facilitate cross
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compilation of CPython to WebAssembly (WASM).
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## wasm32-emscripten build
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Cross compiling to wasm32-emscripten platform needs the [Emscripten](https://emscripten.org/)
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tool chain and a build Python interpreter.
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All commands below are relative to a repository checkout.
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### Compile a build Python interpreter
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```shell
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mkdir -p builddir/build
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pushd builddir/build
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../../configure -C
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make -j$(nproc)
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popd
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```
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### Fetch and build additional emscripten ports
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```shell
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embuilder build zlib
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```
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### Cross compile to wasm32-emscripten
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For browser:
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```shell
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mkdir -p builddir/emscripten
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pushd builddir/emscripten
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CONFIG_SITE=../../Tools/wasm/config.site-wasm32-emscripten \
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emconfigure ../../configure -C \
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--host=wasm32-unknown-emscripten \
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--build=$(../../config.guess) \
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--with-emscripten-target=browser \
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--with-build-python=$(pwd)/../build/python
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emmake make -j$(nproc)
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```
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For node:
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```
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CONFIG_SITE=../../Tools/wasm/config.site-wasm32-emscripten \
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emconfigure ../../configure -C \
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--host=wasm32-unknown-emscripten \
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--build=$(../../config.guess) \
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--with-emscripten-target=node \
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--with-build-python=$(pwd)/../build/python
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emmake make -j$(nproc)
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```
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### Test in browser
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Serve `python.html` with a local webserver and open the file in a browser.
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```shell
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emrun python.html
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```
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or
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```shell
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python3 -m http.server
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```
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