[all-commits] [llvm/llvm-project] b46f98: [HIP] fix host-used external kernel (#83870)

[Yaxun (Sam) Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b46f980454d5ceafc8dab37dbdb1011e333ae6de
      https://github.com/llvm/llvm-project/commit/b46f980454d5ceafc8dab37dbdb1011e333ae6de
  Author: Yaxun (Sam) Liu <yaxun.liu at amd.com>
  Date:   2024-03-08 (Fri, 08 Mar 2024)

  Changed paths:
    M clang/lib/Sema/SemaCUDA.cpp
    M clang/lib/Sema/SemaExpr.cpp
    M clang/test/CodeGenCUDA/host-used-extern.cu

  Log Message:
  -----------
  [HIP] fix host-used external kernel (#83870)

In -fgpu-rdc mode, when an external kernel is used by a host function
with weak_odr linkage (e.g. explicitly instantiated template function),
the kernel should not be marked as host-used external kernel, since the
host function may be dropped by the linker. Mark the external kernel as
host-used external kernel will force a reference to the external kernel,
which the user may not define in other TU.

Fixes: https://github.com/llvm/llvm-project/issues/83771



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