title: Enable gcc warning for literal char overflow
body: <p>In gcc even with <code>-Wall</code> on, I get no warning for: <code>char x = 0xff;</code></p>
  
  <p>However with <code>-pedantic</code> I do.</p>
  
  <p>Is there a way to turn on this warning, without using pedantic and getting other pedantic warnings?</p>