@hkvzjal it looks like cross language inlining is not supported. I don’t know if that is what they needed. It goes back to my comment here: An evaluation of risks associated with relying on Fortran for mission critical codes for the next 15 years - #4 by certik, where I suggest that mixing of languages generally makes everything worse, you have all these interface problems. It’s better to choose just one language and do things in it. This is a tough problem, since they are using Amrex, which is in C++, and it might be hard to create performing Fortran wrappers so that one can use it with Fortran projects and run well on GPUs. I think long term there should be a way to do that, but I can easily see how this becomes a maintenance burden, and just doing it in C++ is a lot simpler.
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