[PATCH] D97040: [llvm-objcopy][MachO] Add support for --keep-undefined

[Alexander Shaposhnikov via Phabricator via llvm-commits]

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This diff introduces --keep-undefined for llvm-objcopy/llvm-strip for Mach-O.
This flag is equivalent to the option "-u" of cctools strip https://www.unix.com/man-page/osx/1/strip/ .

Test plan: make check-all


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97040

Files:
  llvm/test/tools/llvm-objcopy/MachO/keep-undefined.test
  llvm/tools/llvm-objcopy/COFF/COFFObjcopy.cpp
  llvm/tools/llvm-objcopy/CommonOpts.td
  llvm/tools/llvm-objcopy/CopyConfig.cpp
  llvm/tools/llvm-objcopy/CopyConfig.h
  llvm/tools/llvm-objcopy/ELF/ELFObjcopy.cpp
  llvm/tools/llvm-objcopy/MachO/MachOObjcopy.cpp

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