title: Makefile : what is the difference between '-j' option and '-l' option?
body: <p>I was reading GNU make manual and I got a question..</p>
  
  <p>Regarding the parallel execution, I don't get the differece between <code>-j</code> option and <code>-l</code> options.</p>
  
  <p>As I understand, they have the same role to limit the jobs number.
  But the manual tells me that two options are different.</p>
  
  <p>Please answer. Thanks!</p>