title: Yocto: how to remove a layer without rebuild all
body: <p>I'm playing with a Yocto project that has in its <code>conf/bblayers.conf</code> file the following line:</p>
  
  <pre><code>ADDONSLAYERS += "${@'${OEROOT}/layers/meta-qt5' if os.path.isfile('${OEROOT}/layers/meta-qt5/conf/layer.conf') else ''}"
  </code></pre>
  
  <p>I partially bitbaked the project but now I want to try to disable the whole meta-qt5 layer.
  After commenting out the line above, how to remove the already built files from the output folder and go on with the others?</p>
  
  <p>I tried with <code>bitbake -c cleansstate meta-qt5</code> but it doesn't work. I guess it works with recipes only, and not with whole layers.</p>