Comment (by Roland Haas):

I have a branch and thornlist for CarpetX that lets me compile for GPUs without having to use nvcc for linking or compiling all CXX code (other than those thorns that mix CUDA and C++ code). See https://bitbucket.org/eschnett/cactusamrex/wiki/Home

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2553/cactus-link-command-uses-cppflags-and