{ stdenv, clang, pkgsCross }:

stdenv.mkDerivation {
  name = "triangle";
  src = ./.;

  nativeBuildInputs = [ clang ];
  

  configurePhase = "";
  buildPhase = ''
    clang \
      --target=wasm32-unknown-wasi \
      --sysroot ${pkgsCross.wasi32.wasilibc} \
      -O3 \
      -flto \
      -nostdlib \
      -Wl,--no-entry \
      -Wl,--export-all \
      -Wl,--lto-O3 \
      -o triangle.wasm \
      triangle.c
  '';

  checkPhase = "";
  installPhase = ''
    mkdir -p $out
    ls -al
    mv triangle.js triangle.wasm $out
  '';
}