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I don't understand why it would be that way. Is there some inherent property of macho object files that make them outside the scope of LLD?

No, it is just that nobody is currently working on it. Last I talked with the Apple folks they are just busy with other stuff.

Patches are definitely welcome for MachO improvements in LLD (as always in LLVM!). You should be aware though that the Apple folks feel strongly that the original "atom" linker design is the one that they want to use. If you want to start a MachO linker based on the COFF/ELF design (which has been very successful) you will want to ping the llvm-dev mailing list first to talk with the Apple folks (CC Lang Hames and Jim Grosbach).

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