[PATCH] D29590: Generalize SHF_LINK_ORDER to user defined sections

[Rafael Ávila de Espíndola via Phabricator via llvm-commits]

rafael created this revision.

The discussion about gcing metadata sections at generic-abi at googlegroups.com  currently favours having a section flag that would indicate that a one section contains metadata to the section linked to via .sh_link. There is also the desire to reuse SHF_LINK_ORDER and rename it.

This patch implements that idea while still using the SHF_LINK_ORDER name. This is a valid extension of SHF_LINK_ORDER is used for.


https://reviews.llvm.org/D29590

Files:
  lld/ELF/MarkLive.cpp
  lld/test/ELF/gc-sections-metadata.s
  llvm/docs/Extensions.rst
  llvm/include/llvm/MC/MCContext.h
  llvm/lib/MC/ELFObjectWriter.cpp
  llvm/lib/MC/MCContext.cpp
  llvm/lib/MC/MCParser/ELFAsmParser.cpp
  llvm/test/MC/ELF/section-metadata-err1.s
  llvm/test/MC/ELF/section-metadata-err2.s
  llvm/test/MC/ELF/section-metadata-err3.s
  llvm/test/MC/ELF/section-metadata-err4.s
  llvm/test/MC/ELF/section.s

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