One Quickie

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Convert a preprocessor symbol to an NSString (General->General)

#define CONVERT_SYMBOL_TO_NSSTRING_2(x) @#x
#define CONVERT_SYMBOL_TO_NSSTRING(x) CONVERT_SYMBOL_TO_NSSTRING_2(x)

NSString *version = CONVERT_SYMBOL_TO_NSSTRING (BUILD_NUMBER);

(Thanks to TVL for helping me figure this one out)