Nim → Wasm, in your browser

A real Nim 2.2.4 compiler (compiled to WebAssembly) running in your browser. It compiles your Nim code to C, then clang.js (compiled to wasm) turns each C file into a wasm object and links them into a final wasm, which runs. Click Build & Run to try it.
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Your Nim code

Output

[waiting for Build & Run…]
How it works (3 stages, all in the browser):
  1. nim compiler (wasm) — compiles your Nim to C (gcc step fails by design; the .c files are what we need).
  2. clang.js (wasm) — for each .c file, runs clang.wasm to produce a .o. Then lld.wasm links all .o files into a single wasm and runs it.
Payload: ~70 MB total, lazy-loaded.