title: Xcode 6 Archiving and get a warning "Skipping copy phase strip ,binary is code signed" when add "share extension" to target
body: <p>I got this warning when I added share extension to my project and archiving it 
  warning: skipping copy phase strip, binary is code signed:              /Users/xxxx/xxx/xxxx/Build/xxxx/Build/Intermediates/ArchiveIntermediates/xxxx/IntermediateBui ldFilesPath/UninstalledProducts/XXX.appex/XXXX</p>
  
  <p>The old question does not provide and insight to correct this . So I decided to ask again. 
  <a href="https://stackoverflow.com/questions/25949108/warning-during-archive-app-with-ios-8-extension-in-xcode-6">Warning during archive App with iOS 8 Extension in Xcode 6</a></p>
  
  <p>Can someone please explain why this is happening ?  Is it because the extension target is already code signed? If so, how to solve it ? </p>
  
  <p>I knew that setting "Strip debug symbols during copy" to "NO" can clear this warning . But it is not actually solve the problem. And what is the drawback of not "stripping debug symbol"? Because my archive size is still the same whether I set this to YES or NO</p>