Comment (by Roland Haas):

Things I cannot / do not want to do in cases like gfortran-10 where the compiler checks types / ranks of arguments:

• use Cray pointers ie loc (not required by Cactus, only the ET)
• use c_loc (is Fortran 2003, but then TYPE(*) is Fortran 2018 so any compiler supporting the latter will support the former) requires use iso_c_binding which I suspect will reveal all kinds of problems with using Fortran modules
• C preprocessor tricks like #define CCTK_PointerTo(a) CCTKi_PointerTo((a)(1)) because it will fail when a is a scalar.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2403/compile-failure-with-gfortran-10-when