[all-commits] [llvm/llvm-project] 86ab98: [ELF] -r: rewrite SHT_GROUP content if some member...

[Fangrui Song via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 86ab98b0014662f489dbee97f7d3b8d2569e37cc
      https://github.com/llvm/llvm-project/commit/86ab98b0014662f489dbee97f7d3b8d2569e37cc
  Author: Fangrui Song <i at maskray.me>
  Date:   2020-07-21 (Tue, 21 Jul 2020)

  Changed paths:
    M lld/ELF/InputSection.cpp
    M lld/ELF/OutputSections.cpp
    M lld/test/ELF/relocatable-comdat.s

  Log Message:
  -----------
  [ELF] -r: rewrite SHT_GROUP content if some members are combined or discarded

* If two group members are combined, we should leave just one index in the SHT_GROUP content.
* If a group member is discarded (/DISCARD/ or upcoming -r --gc-sections combination),
  we should drop its index in the SHT_GROUP content. LLD currently crashes (`getOutputSection()` is null).

Reviewed By: psmith

Differential Revision: https://reviews.llvm.org/D84129