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This doc lists all significant deliberate differences in behavior between LD64 and LLD-MachO.
ObjC symbols treatment
There are differences in how LLD and LD64 handle ObjC symbols loaded from archives.
- LD64:
* Duplicate ObjC symbols from the same archives will not raise an error. LD64 will pick the first one.
* Duplicate ObjC symbols from different archives will raise a "duplicate symbol" error.
- LLD:
* Duplicate symbols, regardless of which archives they are from, will raise errors.