title: xcode7 ios9 about libz.tbd is not an object file (not allowed in a library)
body: <p>Error: </p>
  
  <blockquote>
    <p>/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk/usr/lib/libz.tbd is not an object file (not allowed in a library)</p>
  </blockquote>
  
  <p>If I replace <code>libz.dylib</code> with <code>libz.tbd</code>, xcode shows this bug. My project is a Cocoa Touch Static Library.</p>