[PATCH] D97642: [lld/mac] Implement the missing bits of -undefined

[Nico Weber via Phabricator via llvm-commits]

thakis created this revision.
thakis added a reviewer: lld-macho.
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This adds support for `-undefined dynamic_lookup`, and for
`-undefined warning` and `-undefined suppress` with `-flat_namespace`.

We just replace undefined symbols with a DynamicLookup when we hit them.

With this, `check-llvm` passes when using ld64.lld.darwinnew as host linker.


https://reviews.llvm.org/D97642

Files:
  lld/MachO/SymbolTable.cpp
  lld/MachO/UnwindInfoSection.cpp
  lld/MachO/Writer.cpp
  lld/test/MachO/treat-undef-sym.s

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