One gets such a error message if mpif.h is used in multiple modules.

mpi.mod [if used] is one module that will have this symbol. And if
there is a user module [or petsc module] also using mpif.h - then it
will get a duplicate copy of these symbols - and will result in such a
conflict.

Satish


On Wed, 7 Mar 2018, Smith, Barry F. wrote:

> 
>    You have multiple 
> 
>     use xxxx
> 
>     make sure they don't have multiple paths back to MPI. For example if two 
> of them have use petscsys etc
> 
>    Barry
> 
> 
> > On Mar 7, 2018, at 10:11 AM, Praveen C <prav...@tifrbng.res.in> wrote:
> > 
> > 
> > 
> >> On 07-Mar-2018, at 9:34 PM, Smith, Barry F. <bsm...@mcs.anl.gov> wrote:
> >> 
> >>   Start with one use statement and slowly add more. My guess is multiple 
> >> ones of those modules use the MPI module hence MPI_SUM appears through 
> >> multiple paths.
> >> 
> >>   Barry
> > 
> > Hello Barry
> > 
> > If you mean use of “use mpi”, then I have dont have this anywhere in my 
> > code. I only include petsc includes and modules.
> > 
> > Thanks
> > praveen
> 
> 

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