Correct procedure for rebuilding after a git pull
So I'm looking for the right way to do this. Here's the scenario. I do a complete build of the image core-image-cdv-media for the cedartrail machine. No changes from the basic BSP, except for the addition of my meta-layer that include test audios and videos to help test the media playback using gst-launch. I'm tracking the latest Denzil branch. So everything works well to this point.
Now I see a bunch of patches pushed to Denzil branch and I want to test them. My build directory is untouched since the successful build before. What do I do to rebuild my project to include the latest patches. I've tried things like "bitbake -c cleansstate core-image-cdv-media" before the new "bitbake core-image-cdv-media" and I've tried just rebaking by itself. Something always fails. I've learned that to really test I have to completely delete my build directory saving only my local.conf and bblayer.conf.
Am I missing something or is a complete rebuild the only way to get the new patches in and a successful build??