WebAssembly with Emscripten

Purpose

Guide agents through compiling C/C++ to WebAssembly using Emscripten: emcc flag selection, function exports, memory model configuration, Asyncify for asynchronous C code, debugging WASM binaries, and targeting WASI vs browser.

Triggers

• "How do I compile C to WebAssembly with Emscripten?"
• "How do I export a C function to JavaScript?"
• "How does WebAssembly memory work with Emscripten?"
• "How do I debug a .wasm file?"
• "How do I use Asyncify to make synchronous C code async?"
• "What's the difference between WASI and Emscripten browser target?"

Workflow

1. Setup and first build