title: XCode 6.4 Undefined symbols for architecture arm64
body: <p>Build settings in my project:</p>
  
  <pre><code>Architectures: armv7,arm64
  
  Build Active architectures only: NO
  
  Valid Architectures: armv7 armv7s arm64 arm6
  </code></pre>
  
  <p>I downloaded a prebuilt version of the library from <a href="https://github.com/debris/cryptopp-ios" rel="nofollow noreferrer">Marek Kotewicz's GitHub</a> which supports 64-bit architecture which I verified by terminal as with the help of this <a href="https://stackoverflow.com/a/21261695/3632958">link</a>:</p>
  
  <pre><code>file libcryptopp.a
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>libcryptopp.a: Mach-O universal binary with 5 architectures
  libcryptopp.a (for architecture i386):  current ar archive random library
  libcryptopp.a (for architecture armv7): current ar archive random library
  libcryptopp.a (for architecture armv7s):    current ar archive random library
  libcryptopp.a (for architecture x86_64):    current ar archive random library
  libcryptopp.a (for architecture arm64): current ar archive random library
  </code></pre>
  
  <p>I tried to clean and build the project and it resulted in errors in the project with a message</p>
  
  <pre><code>Undefined symbols for architecture arm64:
  </code></pre>
  
  <p>I have tried each and every answer present on the SO posts and now I am unable to solve this problem, I have to submit my app to App store ASAP.Can someone help me out?</p>
  
  <p>P.S Setting Build active architectures to YES will not solve the problem.</p>