[PATCH] D47249: [ELF] Implement --icf=safe

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: ruiu, echristo, pcc.
Herald added subscribers: llvm-commits, arichardson, mgorny, emaste.
Herald added a reviewer: espindola.
Herald added a reviewer: espindola.

--icf=safe is used in some Android and Chrome builds.

In C++, ctors and dtors are not allowed to be taken addresses. This
property is exploited by gold --icf=safe to fold only ctors and dtors, which is safer than --icf=all.


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D47249

Files:
  ELF/CMakeLists.txt
  ELF/Config.h
  ELF/Driver.cpp
  ELF/ICF.cpp
  ELF/Options.td
  test/ELF/icf-safe.s

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