[PATCH] D78655: [CUDA][HIP] Let non-caputuring lambda be host device

[Artem Belevich via Phabricator via cfe-commits]

tra added a comment.

In D78655#2107190 <https://reviews.llvm.org/D78655#2107190>, @yaxunl wrote:

> It seems we can only promote non-capturing lambdas, no matter whether it has enclosing function or not.


I'd be OK with promoting only non-capturing lambdas until we figure out a consistent way to deal with the capturing ones.
Or we can promote captured ones, too and rely on postponed diags to guard against producing wrong-side code. We may need to improve that a bit anyways. E.g. what should we do if I write something like this:

  __device__ int dv;
  int hv;
  
  __host__ __device__ int hd() {
    return [a = dv, b=hv](){ return a + b;}();
  }

https://godbolt.org/z/op_FE6 -- NVCC complains about not being able to access hv in a device function (which makes sense considering that it converts HD -> D after source splitting, but clang happily allows capturing both variables (but will likely fail during ptxas due to the fact that there will be no hv on device side).


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