[PATCH] D62840: [ELF] Suppress "STT_SECTION symbol should be defined" warnings on .eh_frame, .debug* and .zdebug*

[Fangrui Song via Phabricator via llvm-commits]

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

With -r or --emit-relocs, we warn `STT_SECTION symbol should be defined`
on relocations to discarded section symbol. This was added as an error
in rLLD319404 <https://reviews.llvm.org/rLLD319404>, but was not so effective before D61583 <https://reviews.llvm.org/D61583> (turned to a
warning).

Relocations from .eh_frame .debug* .zdebug* to discarded .text are very
common and somewhat expected. Don't warn on them.

invalid-undef-section-symbol.test can be deleted as what it intended to
check is now covered by the updated comdat-discarded-reloc.s


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D62840

Files:
  ELF/InputSection.cpp
  test/ELF/Inputs/comdat-discarded-reloc.s
  test/ELF/comdat-discarded-reloc.s
  test/ELF/invalid-undef-section-symbol.test

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