[gentoo-cluster] Re: eselect-mpi and boost mpi

[Justin Bronder]

On 13/06/08 14:29 -0700, Bryan Green wrote:
> Bryan Green writes:
> > Hello,
> >
> > Now that I am using empi/eselect-mpi, I would like to install boost-1.35.0
> > with its MPI library (it has an 'mpi' use flag).
> > When I try to emerge it, it trys to pull in sys-cluster/openmpi as a
> > dependency.  I tried adding sys-cluster/openmpi to
> > /etc/portage/package.provided, but for some reason that does not work.
> >
> > Any suggestions on how to get boost-mpi to build against my eselected
> > MPI?  I also wonder if it would really be necessary build a version of boost
> > for each MPI package installed, using 'empi --add ...'.  That seems like
> > overkill.
>
> Having added openmpi to /etc/portage/profile/package.provided,
> I can emerge boost with mpi, but the mpi autodetect fails during the
> compilation with this message:
>
> MPI auto-detection failed: unknown wrapper compiler mpic++
>
> The same occurs if I run 'ebuild ... compile'.
> But if I run the same command as root from the resulting /var/tmp/.../work
> directory, the detection is successful.
>
> Any ideas what might be going on here?  What part of the ebuild environment
> changes such that it does not see mpic++ anymore?
>
> -bryan
>

I haven't looked at this, but if you only have openmpi as installed by empi,
then that's the missing part.  The emerge environment isn't getting the
variables set with eselect-mpi.

Also, if boost is actually linking against mpi, then you will need to get an
mpi.eclass enabled ebuild to use it, which does mean building it for each
implementation you have installed.

I can take a look at the ebuild this weekend or early next week, and
hopefully a port wouldn't be too much work.

-- 
Justin Bronder