unrealengine.com/html5

						git clone https://github.com/kripken/emscripten.git
						git checkout incoming
						

						int main() {
						  char msg[] = "Hello World!";
						  printf("%s\n", msg);
						  return 0;
						}
						

						STATIC_BASE = 8;
						STATICTOP = STATIC_BASE + 24;
						allocate([72,101,108,108,111,32,87,111,114,108,100,33,0,0,0,0,
						  37,115,10,0,0,0,0,0], "i8", ALLOC_NONE, Runtime.GLOBAL_BASE)

						function _main() {
						  var label = 0;
						  var tempVarArgs = 0;
						  var sp  = STACKTOP; STACKTOP = (STACKTOP + 16)|0;
						    (assert((STACKTOP|0) < (STACK_MAX|0))|0);
						  var $1;
						  var $msg=sp;
						  $1=0;
						  var $2=$msg;
						  assert(13 % 1 === 0);(_memcpy($2, ((8)|0), 13)|0);
						  var $3=(($msg)|0);
						  var $4=_printf(((24)|0), (tempVarArgs=STACKTOP,STACKTOP =
						    (STACKTOP + 8)|0,(assert((STACKTOP|0) < (STACK_MAX|0))|0),
						    HEAP32[((tempVarArgs)>>2)]=$3,tempVarArgs));
						    STACKTOP=tempVarArgs;
						  STACKTOP = sp;
						  return 0;
						}
						

The native way

						$ ./configure
						$ make
						$ make install
						

• Compile it to native target
• Compile all dependent libraries
• Configure (with as few features as possible)
• Compile it to javascript

							var home = FS.createFolder('/', 'home', true, false);
							FS.createFolder(home, 'user', true, true);
							FS.createDataFile('/', 'text.txt', 'Hello World', true, false);
							/* FS.createLazyFile('/', 'site.html',
							     'other/page.htm', true, false); */
							FS.createDevice('/dev', 'random', function() {
							  return Math.floor(Math.random() * 256);
							});
						

• Calling compiled code during compilation
• Unsupported C/C++ API call
  • ./src/library.js
  • ./tests/runner.py
• Use EMCC_DEBUG=2 emmake make

• Run compiled script in WebWorker
• Use message passing to get status/results
• FS.createLazyFile() uses sync XMLHttpRequest
  which is disabled for Firefox and Chromium
  but not for WebWorkers!

Web 2.0