[PATCH] D105911: [CallGraphSection] Introduce CGSectionFuncComdatCreator pass

[Necip Fazil Yildiran via Phabricator via cfe-commits]

necipfazil created this revision.
necipfazil added reviewers: lattner, morehouse, kcc, llvm-commits.
Herald added subscribers: ormris, hiraditya, mgorny.
necipfazil requested review of this revision.
Herald added projects: clang, LLVM.
Herald added a subscriber: cfe-commits.

Create comdats for functions whose symbols will be referenced from the
call graph section. These comdats are used to create the call graph
sections, so that, the sections can get discarded by the linker if the
functions get removed.

Original RFC: https://lists.llvm.org/pipermail/llvm-dev/2021-June/151044.html
Updated RFC: https://lists.llvm.org/pipermail/llvm-dev/2021-July/151739.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105911

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  llvm/include/llvm/Transforms/Utils/CGSectionFuncComdatCreator.h
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/lib/Transforms/Utils/CGSectionFuncComdatCreator.cpp
  llvm/lib/Transforms/Utils/CMakeLists.txt
  llvm/test/Transforms/Util/create-function-comdats.ll

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