[clang] [llvm] [LinkerWrapper] Support relocatable linking for offloading (PR #80066)

[Artem Belevich via llvm-commits]

Artem-B wrote:

> the idea is that it would be the desired effect if someone went out of their way to do this GPU subset linking thing.

That would only be true when someone owns the whole build. That will not be the case in practice. A large enough project is usually a bunch of libraries created by different teams and vendors. They may or may not be built together and how a particular library is built is often controlled by its owner and may not be visible to the end user. The owners may consider switching to device linking to be benign or irrelevant to the end users, but it will be observable by those upstream users.

Being aware of the quirks introduced by device linking will be required for the owners of those libraries. You do know how it all works under the hood. Pretty much nobody else on the planet does. :-)

Anyways. I think we're in agreement that we do need to document possible implications.  clang-linker-wrapper docs would do. 




https://github.com/llvm/llvm-project/pull/80066