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Example for a Emscripten project boilerplate
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| #!/bin/bash | |
| set -e | |
| export OPTIMIZE="-Os" | |
| export LDFLAGS="${OPTIMIZE}" | |
| export CFLAGS="${OPTIMIZE}" | |
| export CPPFLAGS="${OPTIMIZE}" | |
| echo "=============================================" | |
| echo "Compiling wasm bindings" | |
| echo "=============================================" | |
| ( | |
| # Compile C/C++ code | |
| emcc \ | |
| ${OPTIMIZE} \ | |
| --bind \ | |
| -s STRICT=1 \ | |
| -s ALLOW_MEMORY_GROWTH=1 \ | |
| -s ASSERTIONS=0 \ | |
| -s MALLOC=emmalloc \ | |
| -s MODULARIZE=1 \ | |
| -s EXPORT_ES6=1 \ | |
| -o ./my-module.js \ | |
| my-module.cpp | |
| # Create output folder | |
| mkdir -p dist | |
| # Move artifacts | |
| mv my-module.{js,wasm} dist | |
| ) | |
| echo "=============================================" | |
| echo "Compiling wasm bindings done" | |
| echo "=============================================" |
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| <!doctype html> | |
| Open the console to see the output from the wasm module. | |
| <script type="module"> | |
| import wasmModule from "./my-module.js"; | |
| const instance = wasmModule({ | |
| onRuntimeInitialized() { | |
| instance.sayHello(); | |
| } | |
| }); | |
| </script> |
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| #include <emscripten/bind.h> | |
| using namespace emscripten; | |
| int say_hello() { | |
| printf("Hello from your wasm module\n"); | |
| return 0; | |
| } | |
| EMSCRIPTEN_BINDINGS(my_module) { | |
| function("sayHello", &say_hello); | |
| } |
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| { | |
| "name": "my-worldchanging-project", | |
| "scripts": { | |
| "build:emscripten": "docker run --rm -v $(pwd):/src trzeci/emscripten ./build.sh", | |
| "build:app": "cp index.html dist/index.html", | |
| "build": "npm run build:emscripten && npm run build:app", | |
| "serve": "http-server -c0 dist" | |
| }, | |
| "devDependencies": { | |
| "http-server": "*" | |
| } | |
| } |
For Windows, this is my package.json / build:emscripten
"build:emscripten": "docker run --rm -v %cd%:/src trzeci/emscripten ./build.sh",
Also, I tried using the official emscripten/emsdk docker image and it was bunk. I got some BindingError when the runtime was trying to load the void type.
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I had to add
--no-entryto theemcccall because there is no main function