title: Unsupported compiler 'com.apple.compilers.llvm.clang.1_0' selected for architecture 'x86_64' on Xcode 7 Beta 2
body: <p>When I incorporated a popular OAuth2 library in iOS called <a href="https://github.com/nxtbgthng/OAuth2Client" rel="noreferrer">OAuth2Client</a> to my iOS app which is developed on Xcode 7 Beta 2 and then tried running the simulator, the following error occurred and the simulator didn't launch.</p>
  
  <blockquote>
    <p>Unsupported compiler 'com.apple.compilers.llvm.clang.1_0' selected for architecture 'x86_64'</p>
  </blockquote>
  
  <p>What does this error mean? A lot of warnings (yellow triangle) followed with the error above (red octagon), such as:</p>
  
  <blockquote>
    <p>warning: no rule to process file '/Users/myUsername/myAppname/Pods/NXOAuth2Client/Sources/NSData+NXOAuth2.m' of type sourcecode.c.objc for architecture x86_64</p>
  </blockquote>
  
  <p>How can I deal with the these errors and run the simulator properly? Or does CocoaPods only work on environments prior to Xcode 7 Beta?</p>
  
  <h3>UPDATE</h3>
  
  <p>Later I found that this occurs on any projects I create, not only on a project using CocoaPods. The only clue that occurs to me is that when I updated my iTunes to 12.2 today and then launched my Xcode, the dialog popped up, instructing to install new command-line tools.</p>
  
  <h3>UPDATE 2</h3>
  
  <p>I just upgrade to Xcode 7 Beta 3 but the error still got me annoyed...</p>