在新的XCode 5.1中，arm64已成为可供构建的标准体系 struct 之一.
然而，在我目前的项目中，我包括了尚未支持这种新体系 struct 的库(例如Google AdMob)，这些库现在正在导致链接器错误:
ld: symbol(s) not found for architecture arm64
例如，Google AdMob 6.8.0是said to be supporting arm64，但我不能确认这一点，除非cputype (16777228) cpusubtype (0)是arm64？(通过文件命令行工具找到)
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
有办法吗？