build.bat

emcc hello.cpp -o bin/hello.js

build2.bat

call emcc C:\Development\Emscripten\emscripten\system\lib\libcxx\condition_variable.cpp -c
call emcc hello.cpp -o bin/hello.js

hello.cpp

#include <iostream>
using namespace std;

int main () {
  
	cout << "Hello World!";
	return 0;
	
}