include-stdpar headers break atomics on Circle
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Description
I posted this issue to the stdexec repo, but as I do more digging it's clear it's a libcudacxx issue.
https://github.com/NVIDIA/stdexec/issues/866
Flipping -stdpar breaks my atomics. It appears that I have to define `__PGIC__` in order to enable`_LIBCUDACXX_COMPILER_PGI` in order to enable `_LIBCUDACXX_HAS_CUDA_ATOMIC_IMPL` in order to include atomic_cuda.h from atomic. Is pretending to be a PGI compiler the only way to get stdpar working?
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