title: How to use .h.gch files
body: <p>I recently found out about precompiled headers in <code>C++</code>, specifically for <code>gcc</code> compilers.
  I did find something about the <code>.h.gch</code> files on the net, but haven't yet been able to use them.</p>
  
  <p>I need to know:</p>
  
  <ol>
  <li>How to create a <code>.h.gch</code> file?
  My code isn't creating one?</li>
  <li>Once created, how to use it?
  do you include it like any other user-defined file? 
  ex: <code>#include "SomeCode.h.gch"</code></li>
  </ol>
  
  <p>Or is there some other way of using it?
  please help</p>