Gwynne Raskind:
dyld is one of the most essential parts of OS X; without it, nothing but the kernel would run. With that responsibility inevitably comes significant complexity, and dyld has it aplenty. Some of that complexity comes from the massive backwards-compatibility requirements of dyld, and some simply from the sheer scope of the tasks it must handle. Most developers will have no need to understand linking in such detail, but maybe the next time you get a strange error message in Xcode from the linker, you’ll have a better idea of where to look for the problem.
dyld Mac Programming
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