title: Force gfortran to stop program at first NaN
body: <p>To debug my application (fortran 90) I want to turn all NaNs to signalling NaN. </p>
  
  <p>With default settings my program works without any signals and just outputs NaN data in file. I want find the point, where NaN is generated. If I can recompile program with signalling NaN, I will get an <code>SIGFPE</code> signal at first point where first wrong floating operation reside.</p>