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Differential D52198

llvm-objcopy: --discard-locals/--discard-all: allow and keep symbols referenced by relocations
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Authored by emaste on Aug 28 2025, 12:11 AM.
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rGe01971362fe6: Merge commit 7a66a26658f4 from llvm git (by Fangrui Song):
rG4558fc4f91dc: Merge commit 7a66a26658f4 from llvm git (by Fangrui Song):
rG959806e0a844: Merge commit 7a66a26658f4 from llvm git (by Fangrui Song):
Summary
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

Pulled from LLVM, https://github.com/llvm/llvm-project/commit/7a66a26658f40d00ad4c298260d9c3b8f91e1368 for PR 258820.

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contrib/
llvm-project/
llvm/
lib/
ObjCopy/
ELF/
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contrib/llvm-project/llvm/lib/ObjCopy/ELF/ELFObjcopy.cpp

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