emsdk
Install
See https://emscripten.org/docs/getting_started/downloads.html
git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
git pull
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh
emcc -v
# See https://emscripten.org/docs/getting_started/downloads.html
hello.cc
emcc ./hello.cc
# It generates a.out.js, a.out.wasm
(py38) kuangfangjun:test-wasm$ ls
a.out.js a.out.wasm hello.cc
(py38) kuangfangjun:test-wasm$ file a.out.wasm
a.out.wasm: WebAssembly (wasm) binary module version 0x1 (MVP)
(py38) kuangfangjun:test-wasm$ ls -lh a.out.wasm
-rwxr-xr-x 1 kuangfangjun root 156K Jul 27 15:10 a.out.wasm
emcc ./hello.cc -o hello.js
# It generates hello.js, hello.wasm
Create a file test.html containing:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Emscripten:Hello world</title>
</head>
<body>
<script src="hello.js"></script>
</body>
</html>
Start a python http web server python3 -m http.server 6006, the log
is printed to the browser console.
Or use emrun ./hello.html.
Also, we can use node to run it: node hello.js.
Now delete hello.html and use
emcc hello.cc -o hello.html
# It will generate: hello.html, hello.js, hello.wasm