title: How to speed up C++ compilation
body: <p>do you have any tips to  really speed up a large C++ source code ?</p>
  
  <p>I compiled QT5 with last visual studio 2013 compiler, this took at least 3 hours with intel quad core 3.2GHz, 8GB memory and SSD drive. </p>
  
  <p>What solutions do I have if I want to do this  in 30 minutes  ?</p>
  
  <p>thanks.</p>