jdoerfert added a comment.

In D143306#4145603 <https://reviews.llvm.org/D143306#4145603>, @tstellar wrote:

> In D143306#4145432 <https://reviews.llvm.org/D143306#4145432>, @MaskRay wrote:
>
>> This is the point. Specifying a driver option to use 
>> libc++/libc++abi/libunwind doesn't magically change `DT_RUNPATH`. This is 
>> exactly the behavior a user wants for a system Clang.
>> It does make users with a non-system Clang inconvenient but that's the point 
>> that such users should specify rpath by themselves.
>> openmp should not diverge from libc++/libc++abi/libunwind in this regard.
>
> To me this is a really strong argument in favor of this change.  Why does 
> libomp need to be different here?

Because lots of HPC users wouldn't use it otherwise. (In the sense that it 
doesn't work out-of-the-box and they give up.)

To make more technical arguments why this is different:

- libomp(target) is the only one of these runtimes that has multiple levels of 
dynamically loaded runtimes (at least that I know of).
- libomp(target) is the only one that is modified and distributed under the 
same name by ~4 "other compilers" (XL, icx, amdclang, cce) and as such appears 
on a system multiple times in incompatible but somewhat "same" looking versions.
- libomp(target) is build and used by application developers directly from our 
main/dev branch


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D143306/new/

https://reviews.llvm.org/D143306

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