I am working to improve PETSc support for Fortran and to automate more of the process so our Fortran coverage will be complete and always up-to-date.
This will require a few small changes in the usage from Fortran. Could you please take a look at https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/7598__;!!G_uCfscf7eWS!fnJy7aGoJDjNKY2hei6kcg1iNooee8vbE8XyX8qLz59wS4gTMHh87-8bO041Q0fvKaLCzgbUmH9QjqxFvI_CK2k$ and make any comments or suggestions. Thanks Barry The changes would appear in the next release of PETSc in October and would not slightly backward incompatible with older versions of PETSc. But the compiler will tell you what needs to be updated.