[all-commits] [llvm/llvm-project] 7a66a2: [llvm-objcopy, ELF] --discard-locals/--discard-all:...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a66a26658f40d00ad4c298260d9c3b8f91e1368
      https://github.com/llvm/llvm-project/commit/7a66a26658f40d00ad4c298260d9c3b8f91e1368
  Author: Fangrui Song <i at maskray.me>
  Date:   2025-03-11 (Tue, 11 Mar 2025)

  Changed paths:
    M llvm/docs/CommandGuide/llvm-objcopy.rst
    M llvm/docs/ReleaseNotes.md
    M llvm/lib/ObjCopy/ELF/ELFObjcopy.cpp
    M llvm/test/tools/llvm-objcopy/ELF/discard-all.test
    R llvm/test/tools/llvm-objcopy/ELF/discard-locals-rel.test
    M llvm/test/tools/llvm-objcopy/ELF/discard-locals.test

  Log Message:
  -----------
  [llvm-objcopy,ELF] --discard-locals/--discard-all: allow and keep symbols referenced by relocations

In GNU objcopy, symbols referenced by relocations are retained. Our COFF
(https://reviews.llvm.org/D56480) and Mach-O
(https://reviews.llvm.org/D75104) ports port the behavior, but the ELF
port doesn't.

This PR implements the behavior for ELF.
Close #47468 (tcl has a use case that requires `strip -x tclStubLib.o`
to strip local symbols not referenced by relocations.)

Pull Request: https://github.com/llvm/llvm-project/pull/130704



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