ios sdk6.1 Link against the umbrella framework 'System.framework' instead.

尼玛,升级到xcode 4.6的bug:

ld: cannot link directly with /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/usr/lib/system/libcommonCrypto.dylib.  Link against the umbrella framework 'System.framework' instead.
ios编程群里提问才有了些启发:
'System.framework' 实际是libSystem.dylib

也即添加一个库:libSystem.dylib


有时候可能要去掉 libcommonCrypto.dylib

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