| This folder contains list of symbols that should be excluded from the builtin | 
 | libraries for Darwin. There are two reasons symbols are excluded: | 
 |  | 
 | (1) They aren't supported on Darwin | 
 | (2) They are contained within the OS on the minimum supported target | 
 |  | 
 | The builtin libraries must contain all symbols not provided by the lowest | 
 | supported target OS. Meaning if minimum deployment target is iOS 6, all builtins | 
 | not included in the ios6-<arch>.txt files need to be included. The one catch is | 
 | that this is per-architecture. Since iOS 6 doesn't support arm64, when supporting | 
 | iOS 6, the minimum deployment target for arm64 binaries is iOS 7. |