Learn WebAssembly

Compiling the C code

In order to compile a C/C++ file with Emscripten, we'll use the emcc command. We need to pass some arguments to the compiler to ensure we get a valid output that we can utilize in the browser. To generate a Wasm file from a C/C++ file, the command follows this format:

emcc <file.c> -Os -s WASM=1 -s SIDE_MODULE=1 -s BINARYEN_ASYNC_COMPILATION=0 -o <file.wasm>

Here's a breakdown of each of the arguments for the emcc command:

Argument	Description
<file.c>	Path of the C or C++ input file that will be compiled down to a Wasm module; we'll replace this with the actual file path when we run the command.
-Os	Compiler optimization level. This optimization flag allows for module instantiation without requiring Emscripten's ...