title: CocoaPods linking "clang: error: no such file or directory: 'dynamic_lookup' and 'suppress'"
body: <p>I'm getting a clang error when my project tries to link.</p>
  
  <p>I can see the following flags in the Pods.debug.xcconfig and Pods.release.xcconfig</p>
  
  <pre><code>-undefined dynamic_lookup suppress
  </code></pre>
  
  <p>And then the error appears in issue navigator</p>
  
  <pre><code>clang: error: no such file or directory: 'dynamic_lookup'
  clang: error: no such file or directory: 'suppress'
  </code></pre>
  
  <p>I've tried removing the following files incase it was some generated code that was causing the issues</p>
  
  <pre><code>Pods/
  project.xcworkspace
  pods.lockfile
  </code></pre>
  
  <p>and re-running <code>pod install</code> to re-generate the workspace and config files. The error is still appearing!</p>