[all-commits] [llvm/llvm-project] 5582a7: [TargetMachine] Set dso_local if asan is detected

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5582a7987662a92eda5d883b88fc4586e755acf5
      https://github.com/llvm/llvm-project/commit/5582a7987662a92eda5d883b88fc4586e755acf5
  Author: Fangrui Song <i at maskray.me>
  Date:   2020-12-05 (Sat, 05 Dec 2020)

  Changed paths:
    M llvm/lib/Target/TargetMachine.cpp

  Log Message:
  -----------
  [TargetMachine] Set dso_local if asan is detected

AddressSanitizer instrumentation does not set dso_local on non-thread-local
global variables in -fno-pic and it seems to rely on implied dso_local to work.
Add a hack until we have fixed AddressSanitizer to call setDSOLocal() as
appropriate.

Thanks to Vitaly Buka for reporting the issue and suggesting the way to detect asan.