title: Cannot add embedded binaries (other projects) to project dependencies in XCode
body: <p>I have an XCode workspace created with XCode 6.0.1. It constains 2 (Swift) libraries and one iOS app (Swift) that depends on those 2 libraries. I had stable setup that allowed me to run the iOS app on both iPhone and simulators: The 2 library projects were added as <em>Embedded Binaries</em> (see picture) of the app.</p>
  
  <p>Now, I have XCode 6.1. Recently, I deleted <code>DerivedData</code> folder in <code>~/Library/Developer/Xcode</code> folder while XCode was running. After that my workspace did not work - the iOS app would fail to compile and I got linker error saying it cannot find the library projects.</p>
  
  <p>I tried to solve it by removing my the 2 libraries from <em>Embedded Binaries</em> of the app project - and I cannot add them back. Clicking + button under <em>Embedded Binaries</em> in project settings displays workspace projects correctly but selecting and adding my library project does not add them to the list of <em>Embedded Binaries</em>. I have solved the linker error by creating new workspace. The app compiles but how it links the libraries is a mystery to me: They are not in listed <em>Embedded Binaries</em> or <em>Linked Frameworks and Libraries</em> not in the <em>Frameworks search path</em>. There appears to be no link between the app and the libraries it needs (and obviously have as it compiles) except that libraries projects are in the same workspace.</p>
  
  <p>Why I cannot add library projects to <em>Embedded Binaries</em>? Is it normal in XCode 6.1 that dependency projects just compile and gets embedded into an app without being listed or linked anywhere?</p>
  
  <p><img src="https://i.stack.imgur.com/r828d.jpg" alt="enter image description here"></p>