title: using bridging headers with framework targets is unsupported
body: <p>I want to make a pod mixed Objective-C and Swift. And i add</p>
  
  <pre><code>s.pod_target_xcconfig = { 'SWIFT_OBJC_BRIDGING_HEADER' =&gt;'$(PODS_ROOT)/../SwiftDemo/SwiftDemo-Bridging-Header.h' }
  </code></pre>
  
  <p>in my <code>podspec</code> file。</p>
  
  <p>But there's still one error occured when i verify the <code>podspec</code> file:</p>
  
  <pre><code>- ERROR | [iOS] xcodebuild: Returned an unsuccessful exit code.
  - NOTE  | xcodebuild:  &lt;unknown&gt;:0: error: using bridging headers with framework targets is unsupported
  </code></pre>
  
  <p>Someone asked this question at <a href="https://github.com/CocoaPods/CocoaPods/issues/7213" rel="nofollow noreferrer"> #7213</a>, but it has no help for me. </p>