[PATCH] D84131: [ELF] Support -r --gc-sections

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: grimar, jhenderson, pcc, psmith.
Herald added subscribers: llvm-commits, arichardson, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

-r --gc-sections is usually not useful because it just makes intermediate output
smaller. https://bugs.llvm.org/show_bug.cgi?id=46700#c7 mentions a use case:
validating the absence of undefined symbols ealier than in the final link.

After D84129 <https://reviews.llvm.org/D84129> (SHT_GROUP support in -r links), we can support -r
--gc-sections without extra code. So let's allow it.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84131

Files:
  lld/ELF/Driver.cpp
  lld/ELF/InputFiles.cpp
  lld/test/ELF/driver.test
  lld/test/ELF/relocatable-gc.s

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