[all-commits] [llvm/llvm-project] b81244: Add LLVM_ATTRIBUTE_USED to fix problems which coul...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b81244fa4ff9188df22847c6e11e050892292002
      https://github.com/llvm/llvm-project/commit/b81244fa4ff9188df22847c6e11e050892292002
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-04-26 (Mon, 26 Apr 2021)

  Changed paths:
    M llvm/lib/Support/BuryPointer.cpp
    M llvm/lib/Support/Unix/Signals.inc

  Log Message:
  -----------
  Add LLVM_ATTRIBUTE_USED to fix problems which could be exposed by aggressive global pointer variable removal

Note to BuryPointer.cpp:GraveYard. 'unused' cannot prevent (1) dead store
elimination and (2) removal of the global pointer variable (D69428) but 'used' can.

Discovered when comparing link maps between HEAD+D69428 and HEAD.

Reviewed By: lattner

Differential Revision: https://reviews.llvm.org/D101217