title: Unable to determine compiler to use - the abstract compiler specification is missing from this Xcode installation
body: <p>Hi I have iMac with OS X Yosemite version 10.10.3 and I've installed the last Xcode 6.3 beta 2 with Swift 1.2 and when I try to Run the App I receive: 
  Check dependencies
  Unable to determine compiler to use - the abstract compiler specification is missing from this Xcode installation.</p>
  
  <p>and everytime when I open my project with Xcode I receive a warning:
  warning: no rule to process file '/Users/Bogdan-iMac/Desktop/My App/My App/My_App.xcdatamodel' of type wrapper for architecture x86_64
  and I have to open Build Phases in Compile Sources I have to remove My_App.xcdatamodel and add it again to prevent the warning</p>
  
  <p>Link in Apple Dev Forums: <a href="https://devforums.apple.com/thread/263126" rel="nofollow">https://devforums.apple.com/thread/263126</a></p>