[Openmp-dev] Declare variant + Nvidia Device Offload

[Jonas Hahnfeld via Openmp-dev]

Am Dienstag, den 19.05.2020, 17:50 +0200 schrieb Lukas Sommer via
Openmp-dev:
> Hi Johannes,
> 
> > Yes, we need to replace the dot with either of the symbols you
> > mentioned. If we can use the same symbols on the host, I'm fine with
> > chaining it unconditionally. 
> 
> I've prototyped this change locally, replacing the dot with a
> dollar-sign in the places you mentioned. With this change, declaring
> variants for offloading to CUDA devices works for my testcase in my
> setup (ARM + Nvidia SM 7.2).
> 
> If you want, I could create a patch for that, but do you (or anyone else
> on the list) know whether the other offloading targets (AMDGPU, NEC VE,
> ...) are all able to handle the dollar sign in the mangled name, so we
> could make this change unconditionally? I do not have a setup for each
> of these to test.
> 
> I was also wondering if legalizing the mangled name shouldn't be handled
> by the backend (NVPTX in this case) instead of the OpenMP-specific parts.

For some context on this, see the following set of reviews:
https://reviews.llvm.org/D17738
https://reviews.llvm.org/D29883
https://reviews.llvm.org/D39005
https://reviews.llvm.org/D40573

My favorite statement from the last patch: "This is silly. This bug has
been open for so long that nvidia could've just fixed their toolchain
by now to accept dots in symbol names."

Jonas
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