'linking ObjC for iOS Simulator, but object file was compiled for MacOSX - Xcode 5 Preview

I have just switch to Xcode 5 Preview, getting lots of warning for one of existing project.

ld: warning: linking ObjC for iOS Simulator, but object file (/Projects/iOs/WWS/SVN/iOS/WWS/WWS/ExtFrameworks/GoogleAdMobAdsSdkiOS/libGoogleAdMobAds.a(GADSearchRequestPrivate.o)) was compiled for MacOSX
ld: warning: linking ObjC for iOS Simulator, but object file (/Projects/iOs/WWS/SVN/iOS/WWS/WWS/ExtFrameworks/GoogleAdMobAdsSdkiOS/libGoogleAdMobAds.a(GADCachedFile.o)) was compiled for MacOSX
ld: warning: linking ObjC for iOS Simulator, but object file (/Projects/iOs/WWS/SVN/iOS/WWS/WWS/ExtFrameworks/GoogleAdMobAdsSdkiOS/libGoogleAdMobAds.a(GADNetworkChecker.o)) was compiled for MacOSX
ld: warning: linking ObjC for iOS Simulator, but object file (/Projects/iOs/WWS/SVN/iOS/WWS/WWS/ExtFrameworks/GoogleAdMobAdsSdkiOS/libGoogleAdMobAds.a(GADTiming.o)) was compiled for MacOSX
ld: warning: linking ObjC for iOS Simulator, but object file (/Projects/iOs/WWS/SVN/iOS/WWS/WWS/ExtFrameworks/GoogleAdMobAdsSdkiOS/libGoogleAdMobAds.a(GADTimingManager.o)) was compiled for MacOSX
ld: warning: linking ObjC for iOS Simulator, but object file (/Projects/iOs/WWS/SVN/iOS/WWS/WWS/ExtFrameworks/GoogleAdMobAdsSdkiOS/libGoogleAdMobAds.a(GADRequestError.o)) was compiled for MacOSX


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