title: Undefined symbols for architecture armv7s: "_OBJC_CLASS_$_ZXingWidgetController", referenced from: objc-class-ref in RootViewController.o using Zxing
body: <p>I am incorporating qrcode reader from Zxing in my app. I tested the scantest which was there in Zxing before in Xcode4.5 and it working well. I updated the iOS sdk to 6.1 and updated Xcode to 4.6 now this one is showing error. First it was showing error for gcc compiler and its resolved now and now its showing error for</p>
  
  <p><code>"Undefined symbols for architecture armv7s"</code></p>
  
  <p>P.S:- After reading many solutions, I tried changing few things like all architecture set to same(Scantest, ZxingWidget, ZxingTouch), Changed the compiler to LLVM GCC 4.2, set other warning flags to -Werror etc. </p>
  
  <p>Special issue is the build is working for the iphone simulator 6.1.</p>