[petsc-dev] Install location for MPIUNI mpi.h

[Matthew Knepley]

On Wed, Apr 25, 2018 at 2:36 PM, Jed Brown <jed at jedbrown.org> wrote:

> It is currently installed to include/petsc/mpiuni/mpi.h and petscsys.h
> includes it as <mpi.h>, which means that users of MPIUNI need to put
> -I/prefix/include/petsc/mpiuni in their command lines.  Matt and I agree
> that this is bad.  We disagree on the solution.
>
> He wants to install it to /prefix/include/mpi.h as though the user had
> written --download-mpich.  This would conflict if a user later installs
> a real MPI to that location.
>

The idea should be that "installing" means that everyone is using
compatible things
from that location. If you allow an MPIUNI PETSc to be installed to a
location that
also has another MPI, what does mpiexec in ./bin do? There is just as much
potential
for confusion as there is when putting an MPICH PETSc in a location with
OpenMPI
installed.

   Matt


> I would rather that petscsys.h include <petsc/mpiuni/mpi.h> because it
> can't be used without PETSc and nobody who ever wrote #include <mpi.h>
> in their own code will be happy if they get MPIUNI.
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
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