I have existing iphone app which is developed using XCode 4.2 and base sdk as iOS 5.0,Compiler is APPLE LLVM compiler 3.0. Now as the iOS 6 is upcoming am I supposed to (or rather ought to) rebuild this app with latest XCode and the base SDK (i.e. XCode 4.5, base sdk as iOS 6.0, Compiler :-Apple LLVM Compiler 4.1) or will I be OK submitting my upgrade with older XCode and base SDK settings? Will I be facing any issue while submitting my app built with older settings?
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