[all-commits] [llvm/llvm-project] bfa423: [lld][ELF] Support for zero flag section groups

[Petr Hosek via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bfa4235e6e92ce2d3df486828ca2b6aef9705c07
      https://github.com/llvm/llvm-project/commit/bfa4235e6e92ce2d3df486828ca2b6aef9705c07
  Author: Petr Hosek <phosek at google.com>
  Date:   2021-02-16 (Tue, 16 Feb 2021)

  Changed paths:
    M lld/ELF/InputFiles.cpp
    M lld/test/ELF/gc-sections-group.s

  Log Message:
  -----------
  [lld][ELF] Support for zero flag section groups

This change introduces support for zero flag ELF section groups to lld.
lld already supports COMDAT sections, which in ELF are a special type of
ELF section groups. These are generally useful to enable linker GC where
you want a group of sections to always travel together, that is to be
either retained or discarded as a whole, but without the COMDAT
semantics. Other ELF linkers already support zero flag ELF section
groups and this change helps us reach feature parity.

Differential Revision: https://reviews.llvm.org/D96636