title: Unable to refer to methods in another plugin
body: <p>I have a method in <code>classA</code> present in <code>PluginA</code>, I am able to compile and access this method in all the classes inside the same plugin.
  When I try to access the method from another <code>pluginB</code> I get below error. Although I am able to refer and print enums in <code>pluginA</code> from <code>pluginB</code>.</p>
  
  <pre><code>\plugins\pluginB\mocks\classB.cpp:61: error: undefined reference to namespaceA::classA::methodA(int)
  
  collect2.exe:-1: error: error: ld returned 1 exit status
  </code></pre>
  
  <p>Any guidance is much appreciated.</p>
  
  <ul>
  <li>QT: 4.8 </li>
  <li>IDE: QT creator 4.4.0</li>
  <li>OS: Windows 10</li>
  </ul>