Problems in the use of cusparseSpGEMM in CUDA Fortran

That seems reasonable/plausible and I have not checked that.

In my opinion, this question should be addressed on the HPC compilers forum. Most CUDA Fortran questions can be found there. If you wish to post a question there, you can link easily to the one here, or I can move this question for you.

I would rephrase the question if posting there to focus on this specific observation you have made, about the lack of prototype in the Fortran module.