[all-commits] [llvm/llvm-project] f2a133: [CUDA][HIP] Do not mark extern shared var (#65990)

[Yaxun (Sam) Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f2a1331a01ff8ad19fed6bd407501791467ad061
      https://github.com/llvm/llvm-project/commit/f2a1331a01ff8ad19fed6bd407501791467ad061
  Author: Yaxun (Sam) Liu <yaxun.liu at amd.com>
  Date:   2023-09-11 (Mon, 11 Sep 2023)

  Changed paths:
    M clang/include/clang/AST/ASTContext.h
    M clang/lib/Sema/SemaExpr.cpp
    M clang/test/CodeGenCUDA/host-used-extern.cu

  Log Message:
  -----------
  [CUDA][HIP] Do not mark extern shared var (#65990)

Fixes: https://github.com/llvm/llvm-project/issues/65806

Currently clang put extern shared var ODR-used by host device functions
in global var __clang_gpu_used_external. This behavior was due to
https://reviews.llvm.org/D123441. However, clang should not do that for
extern shared vars since their addresses are per warp, therefore cannot
be accessed by host code.