[petsc-users] --with-mpi=0

[Tabrez Ali]

Hi,

I am trying to compile Fortran code with PETSc 3.16 built without MPI,
i.e., --with-mpi=0, and am getting the following error:

   call MPI_Comm_rank(MPI_COMM_WORLD,rank,ierr)
                                         1
Error: Symbol ‘mpi_comm_world’ at (1) has no IMPLICIT type

There are no issues with PETSc 3.14 or prior versions. Any ideas as to what
could be wrong?

I do see the following note (below) in
https://petsc.org/main/docs/changes/315/ but I am not sure if it's related:

*Add configure option --with-mpi-f90module-visibility [default=``1``].
With 0, mpi.mod will not be visible in use code (via petscsys.mod) -
so mpi_f08 can now be used*

Regards,

Tabrez
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