[petsc-users] pass PETSC_NULL_INTEGER to dynamic array of Vec in Frotran90

[Mi Yan]

xlf9014.1  reported error for the below FORTRAN 90 code:

******
MatNullSpace   nullsp
PetscErrorCode   :: ierr
call MatNullSpaceCreate( PETSC_COMM_WORLD, PETSC_TRUE, 0, 
PETSC_NULL_INTEGER, nullsp, ierr );
****
The error message is:
 Actual argument attributes do not match those specified by an accessible 
explicit interface.

The error implies the real argument the attribute of "PETSC_NULL_INTEGER" 
does not match with those specified by the interface.  The interface of 
MatNullSpaceCreate is declared in finclude/ftn-auto/petscmat.h90 ,  whose 
4th dummy argument is declared as
     Vec vecs (*) 

In my code,  PETSC_NULL_INTEGER is passed to an array of Vec.   Is there 
anything wrong here?

thanks,
Mi
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