1 This folder contains list of symbols that should be excluded from the builtin 2 libraries for Darwin. There are two reasons symbols are excluded: 3 4 (1) They aren't supported on Darwin 5 (2) They are contained within the OS on the minimum supported target 6 7 The builtin libraries must contain all symbols not provided by the lowest 8 supported target OS. Meaning if minimum deployment target is iOS 6, all builtins 9 not included in the ios6-<arch>.txt files need to be included. The one catch is 10 that this is per-architecture. Since iOS 6 doesn't support arm64, when supporting 11 iOS 6, the minimum deployment target for arm64 binaries is iOS 7. 12