title: Apple Mach-O Linker error Xcode
body: <p>I try to build my app for archiving in my iPhone and iPad app, but I get this error... This started to happen since I added AdMob. I don't know what is wrong. I hate those Mach-O Linker errors....</p>
  
  <pre><code>Ld "build/Högskoleprovet - Matematik.build/Release-iphoneos/Högskoleprovet - Matematik.build/Objects-normal/armv7s/HP-Matte" normal armv7s
  cd "/Högskoleprovet - Matematik iPad Lite"
  setenv IPHONEOS_DEPLOYMENT_TARGET 5.0
  setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
         /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang - arch armv7s -isysroot               /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk "-L/Högskoleprovet - Matematik iPad Lite/build/Release-iphoneos" "-L/Högskoleprovet - Matematik iPad Lite" "-F/Högskoleprovet - Matematik iPad Lite/build/Release-iphoneos" -filelist "/Högskoleprovet - Matematik iPad Lite/build/Högskoleprovet - Matematik.build/Release-iphoneos/Högskoleprovet - Matematik.build/Objects-normal/armv7s/HP-Matte.LinkFileList" -dead_strip -all_load -ObjC -fobjc-arc -fobjc-link-runtime -miphoneos-version-min=5.0 -framework MessageUI -framework SystemConfiguration -framework AudioToolbox -framework AdSupport -framework StoreKit -framework iAd -framework UIKit -framework Foundation -framework CoreGraphics -lGoogleAdMobAds -o "/Högskoleprovet - Matematik iPad Lite/build/Högskoleprovet - Matematik.build/Release-iphoneos/Högskoleprovet - Matematik.build/Objects-normal/armv7s/HP-Matte"
  
          /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
      duplicate symbol _CFStringToCString in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _CheckJailBreakStatus in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _CompareByAddress in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _ComputeDigest in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _CopyParentMethodFromCallStack in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _CopySystemInformation in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _DoBitSlicer in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _FindSwizzling in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GatherSignals in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetAdVisibility in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetAppUsageTime in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetClassMethod in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetDeviceBatteryLevel in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetDeviceBatteryState in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetDeviceID in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetDeviceOrientation in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetEncryptedData in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetInstanceMethod in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetIntFromDictionary in:
   /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetNetworkType in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetOverlap in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetStackTrace in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetStrFromDictionary in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _GetViewInfo in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _InitGlobalData in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _InitNotifications in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _IsClassMethodAvailable in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _IsDeviceOrientationEnabled in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _IsInstanceMethodAvailable in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _IsPropertyAvailable in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
  duplicate symbol _MD5 in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(md5.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _MD5_final in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(md5.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _MD5_init in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(md5.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _MD5_update in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(md5.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _MethodAddress in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
    duplicate symbol _ObfuscateBinaryValue in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SetBatteryMonitoringStatus in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatFreeBuffer in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatMakeBuffer in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatWriteInt64 in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatWriteRaw in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatWriteString in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatWriteTag in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatWriteVarint32 in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _SimpleWireFormatWriteVarint64 in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(SimpleWireFormat.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _do_rc4 in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(rc4.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _freeDecodedString in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _gad_bs in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(des_e.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _gad_gig in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _gad_gmcs in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _gad_gmrs in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _gad_htg in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGesture.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _gethex in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(rc4.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _htoa in:
   /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(rc4.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _set_crypt_key in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(rc4.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   duplicate symbol _tohex in:
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(rc4.o)
  /Högskoleprovet - Matematik iPad Lite/libGoogleAdMobAds.a(GADGestureCFiles.o)
   ld: 64 duplicate symbols for architecture armv7s
   clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>What could be wrong? Any ideas?
  Thanks in advance!</p>
  
  <p>/A noob</p>