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[lld-macho][nfc] Added some notes on deliberate differences btw LD64 vs LLD-MACHO 

For future references and to help with debugging crashes, this could be useful.

Differential Revision: https://reviews.llvm.org/D110464
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Vy Nguyen 2021-09-24 21:39:30 -04:00
parent edff0070a1
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==================
LD64 vs LLD-MACHO
==================
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.