title: suppress gfortran warning message
body: <p>Does anyone know if there is an option to suppress the following warning message
  from gfortran:</p>
  
  <pre><code>Warning: Extension: Conversion from HOLLERITH to INTEGER(4) at (1)
  </code></pre>
  
  <p>(Without changing the code, that is).</p>
  
  <p>I have already tried the options: <code>-Wno-conversion-extra -Wno-conversion</code></p>
  
  <p>I'm using gfortran 4.9.1 by the way.</p>