title: How to use CocoaPods with multiple Framework subprojects
body: <p>First of all, I've turned on use_framework! in Podfile.</p>
  <p>Assume the main project is MAIN_APP, and two subprojects are FRAMEWORK_A and FRAMEWORK_B.</p>
  <p>MAIN_APP requires FRAMEWORK_A and FRAMEWORK_B, and FRAMEWORK_B requires FRAMEWORK_A as well.</p>
  <p>All projects/targets are using CocoaPods to manage third party libraries.</p>
  <p>For now, my Podfile looks like:</p>
  <pre><code>target :MAIN_APP do
      project 'MAIN_APP'
      pod 'PodA'
  end
  
  target :FRAMEWORK_A do
      project 'FRAMEWORK_A'
      pod 'PodB'
  end
  
  target :FRAMEWORK_B do
      project 'FRAMEWORK_B'
      pod 'PodC'
  end
  </code></pre>
  <p>I manually added FRAMEWORK_A to build settings of FRAMEWORK_B, and both FRAMEWORK_A and FRAMEWORK_B to build settings of MAIN_APP.</p>
  <p>All code compiles well, but when running the MAIN_APP crashes because it cannot load Framework of PodB.</p>
  <p>I know I can manually add PodB to MAIN_APP and FRAMEWORK_B as well, but is it possible to define this kind of target dependency in Podfile?</p>
  <p>Btw, when <code>pod install</code>, I got the warning:</p>
  <blockquote>
  <p>[!] The Podfile contains framework targets, for which the Podfile does not contain host targets (targets which embed the framework).</p>
  <p>If this project is for doing framework development, you can ignore this message. Otherwise, add a target to the Podfile that embeds these frameworks to make this message go away (e.g. a test target).</p>
  </blockquote>
  <p>As I know, I can use nested target for host targets like:</p>
  <pre><code>target :FRAMEWORK_A
      target :MAIN_APP
      end
  end
  </code></pre>
  <p>So CocoaPods will setup MAIN_APP to use FRAMEWORK_A and inherit pod dependencies from FRAMEWORK_A. But seems I cannot do it with multiple dependencies like:</p>
  <pre><code>target :FRAMEWORK_A
      target :MAIN_APP
      end
  end
  target :FRAMEWORK_B
      target :MAIN_APP
      end
  end
  </code></pre>
  <p>Because target :MAIN_APP cannot be declared twice.</p>
  <p>Is there any better solutions instead of defining pod dependencies as a function in Podfile and include in all target?</p>