I was building CM12 from source (in a VM) and when this part came, it took approx. 2 hrs 45 mins.
So try waiting. It will finish (possibly) :)
Guys, I noticed something.
There is ABSOLUTELY NOTHING wrong with the bluetooth module. Check your device bluetooth config file (device/(vendor)/(device name)/bluetooth/bdroid_buildcfg.h). The following three lines must be: