Compiling with gfortran 10 currently fails with (among others):
COMPILING CactusExamples/DemoInterp/src/Interp1D.F /Users/jenkins/Cactus/configs/sim/build/DemoInterp/Interp1D.f:191:37: 183 | interp_coords(1) = CCTK_PointerTo(xcoord) | 2 ...... 191 | out_arrays(2) = CCTK_PointerTo(compinterp1) | 1 Error: Type mismatch between actual argument at (1) and actual argument at (2) (COMPLEX(8)/REAL(8)).
and there seems to be little we can do about this since
CCTK_PointerTo does have to accept all kinds of arguments. The same issue should also affect things like eg
MPI_Send which takes pointers to arbitrary arrays.
This can be turned into a warning by adding
F90FLAGS (see https://github.com/Unidata/netcdf-fortran/issues/212), though the option only exists for gfortran 10 so cannot be added to the default set of flags.
If the issue indeed also affects MPI I would expect that the next version of gfortran no longer produces the warning.