[petsc-users] Usage of PETSC_NULL_INTEGER for PCASMGetSubKSP via Fortran interface

[Mark Adams]

Integers in the C interface are now PETSC_DEFAULT_INTEGER in the Fortran
interface.
Types were not checked in 3.12. THis seems to have started in 3.13.

On Fri, Dec 11, 2020 at 9:50 AM WUKIE, NATHAN A DR-02 USAF AFMC AFRL/RQVC
via petsc-users <petsc-users at mcs.anl.gov> wrote:

> Hello,
>
> It looks like there has been some recent reorganization of Fortran
> interfaces. One item that has cropped up is that the interface for
> procedure PCASMGetSubKSP has been moved to a module via
> src/ksp/f90-mod/petscksp.h90.
>
> The question I have arrises when trying to pass PETSC_NULL_INTEGER, which
> seems to be an array, but the module interface to PCASMGetSubKSP now checks
> type rank consistency. PCASMGetSubKSP PetscInt arguments expect scalar
> values so just passing PETSC_NULL_INTEGER generates a compile-time error
> due to Scalar - Rank(1) mismatch.
>
> It seems one could pass PETSC_NULL_INTEGER(0) or PETSC_NULL_INTEGER(1),
> but I haven't found any documentation about how that's defined or if this
> is even the correct approach to resolve that issue. Could someone provide
> some insight or advise on the correct way forward?
>
> Thanks,
> Nathan
>
> petsc version: v3.14.2
>
>
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