Comment (by Roland Haas):

Alternatively one may also look for __HCC__ and __CUDACC__ according to https://sep5.readthedocs.io/en/latest/Programming_Guides/HIP-porting-guide.html

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2737/define-cctk_device-and-cctk_host-in-cactus