title: Enable a DEBUG flag in Eclipse internal JavaBuilder
body: <p>There is a class in the Eclipse source code called JavaBuilder[1], which ​has DEBUG and SHOW_STATS flags (static boolean) that I'd like to enable to debug build issues, since they enable printing reasons for rebuild, eg:</p>
  <pre><code>if (DEBUG)
      System.out.println(&quot;JavaBuilder: Performing full build since last saved state was not found&quot;); 
  </code></pre>
  <p>I am guessing that they can be enabled with some argument in &quot;eclipse.ini&quot;?</p>
  <p>I'd like to know what the argument syntax is, and where Eclipse's stdout is logged to.</p>
  <p>Or if one can enable them without restarting Eclipse, of course.</p>
  <hr />
  <p>[1] org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/JavaBuilder.java</p>