[PATCH] D96963: [lld/mac] reject -undefined warning and -undefined suppress with -twolevel_namespace

[Nico Weber via Phabricator via llvm-commits]

thakis created this revision.
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-flat_namespace isn't implemented yet, and neither is -undefined dynamic,
so this makes -undefined pretty pointless in lld/MachO for now. But once
we implement -flat_namespace (which we need to do anyways to get check-llvm
to pass with lld as host linker), the code's already there.

Follow-up to https://reviews.llvm.org/D93263#2491865


https://reviews.llvm.org/D96963

Files:
  lld/MachO/Config.h
  lld/MachO/Driver.cpp
  lld/MachO/Options.td
  lld/test/MachO/treat-undef-sym.s

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