yxsamliu wrote:

> This seems to have perturbed the HIP build. 
> https://lab.llvm.org/staging/#/builders/22/builds/22
> 
> The problem is that we used to set `__AMDGCN_WAVEFRONTSIZE` for the host 
> compilation as well in a bunch of the wave function macros. I think that this 
> is just poor programming, because the host compilation has no what of knowing 
> what the wave size is considering the fact that 
> `--offload-arch=gfx1030,gfx90a` is totally legal and would result in two 
> conflicting wave front sizes from the perspective of the host. The old 
> behavior would just default this to `64` all the time.
> 
> We have two solutions, fix the headers so they don't rely on a device-only 
> macro, or just update this to emit a dummy macro on the host.
> 
> I like the first better, but given that we've shipped this with ROCm in the 
> past it's likely to require a workaround. @yxsamliu What do you think?

can you revert it for now, since this will break all HIP apps. Let's figure out 
a proper solution.

https://github.com/llvm/llvm-project/pull/79660
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