[all-commits] [llvm/llvm-project] b0ac68: [ELF] Prevent internalizing used comdat symbol

Igor Kudrin via All-commits all-commits at lists.llvm.org
Wed Dec 1 21:15:03 PST 2021

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0ac68ccb72909e047c86e6ee7e036d278be28ff
  Author: Igor Kudrin <ikudrin at accesssoftek.com>
  Date:   2021-12-02 (Thu, 02 Dec 2021)

  Changed paths:
    M lld/ELF/InputFiles.cpp
    A lld/test/ELF/lto/comdat-mixed-archive.test

  Log Message:
  [ELF] Prevent internalizing used comdat symbol

When a comdat symbol is defined in both bitcode and regular object
files, which are contained in the same archive, the linker could lose
the flag that the symbol is used in the regular object file and allow
LTO to internalize it, which led to "error: undefined symbol".

The issue was introduced in D79300.

Differential Revision: https://reviews.llvm.org/D114801

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