[all-commits] [llvm/llvm-project] 0658fc: [lld/mac] Implement the missing bits of -undefined

[Nico Weber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0658fc654c758d0bfab7d119ecf94caf5e5276d5
      https://github.com/llvm/llvm-project/commit/0658fc654c758d0bfab7d119ecf94caf5e5276d5
  Author: Nico Weber <thakis at chromium.org>
  Date:   2021-03-01 (Mon, 01 Mar 2021)

  Changed paths:
    M lld/MachO/SymbolTable.cpp
    M lld/MachO/UnwindInfoSection.cpp
    M lld/MachO/Writer.cpp
    M lld/test/MachO/treat-undef-sym.s

  Log Message:
  -----------
  [lld/mac] Implement the missing bits of -undefined

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.

Differential Revision: https://reviews.llvm.org/D97642