title: Ant warning: Implicitly compiled files were not subject to annotation processing
body: <p>I am receiving this warning when running an Ant build script (Ant 1.8.2, Java 1.6).</p>
  
  <pre><code>[javac] warning: Implicitly compiled files were not subject to annotation processing.
  [javac] Use -proc:none to disable annotation processing or -implicit to specify a policy for implicit compilation.
  [javac] 1 warning
  </code></pre>
  
  <p>Adding <code>&lt;compilerarg value="implicit" /&gt;</code> produces:</p>
  
  <pre><code>[javac] error: Class names, 'implicit', are only accepted if annotation processing is explicitly requested
  [javac] 1 error
  </code></pre>
  
  <p>Adding <code>&lt;compilerarg value="proc:none" /&gt;</code> produces:</p>
  
  <pre><code>[javac] javac: invalid flag: proc:none
  [javac] Usage: javac &lt;options&gt; &lt;source files&gt;
  [javac] use -help for a list of possible options
  </code></pre>
  
  <p>Can someone shed some light on what the warning means and how do I get rid of it? </p>