title: Arm64 architecture in xcode 5.1
body: <p>In the new XCode 5.1, arm64 has become among the standard architectures to build for. </p>
  
  <p>However, in current projects of mine I included libraries (Google AdMob for example) that do not yet support this new architecture - these are now causing linker errors:</p>
  
  <pre><code>ld: symbol(s) not found for architecture arm64
  </code></pre>
  
  <p>Google AdMob 6.8.0 for example is <a href="http://googleadsdeveloper.blogspot.com/2013/11/new-google-mobile-ads-sdk-for-ios.html">said to be supporting arm64</a> but I can't really confirm this, unless <code>cputype (16777228) cpusubtype (0)</code> is arm64? (found through the file command-line tool)</p>
  
  <pre><code>libGoogleAdMobAds.a: Mach-O universal binary with 5 architectures
  libGoogleAdMobAds.a (for architecture armv7):   current ar archive random library
  libGoogleAdMobAds.a (for architecture armv7s):  current ar archive random library
  libGoogleAdMobAds.a (for architecture i386):    current ar archive random library
  libGoogleAdMobAds.a (for architecture x86_64):  current ar archive random library
  libGoogleAdMobAds.a (for architecture cputype (16777228) cpusubtype (0)):   current ar archive random library
  </code></pre>
  
  <p>Is there a way to go about this? </p>