title: Disable all but few warnings in gcc
body: <p>In gcc -w is used to disable all warnings. However in this case I can't enable specific ones (e.g. -Wreturn-type).</p>
  
  <p>Is it possible to disable all warnings, but enable few specific ones?</p>
  
  <p>As a workaround, is there a way to generate list of all -Wno-xxx at once? And will it help? I wouldn't want to do this manually just to find out that it is not equal to -w.</p>