Control: tag -1 moreinfo
Hi Drew,
On Mon, 17 Aug 2020 19:23:05 +0800 Drew Parsons <dpars...@debian.org> wrote:
> Package: libhdf5-openmpi-dev
> Version: 1.10.6+repack-2
> Severity: normal
>
> We've set up libhdf5-openmpi-dev (and libhdf5-mpich-dev) to use the
> alternatives mechanism to configure a symlink from a generic pkgconfig
> file hdf5-mpi.pc to the specific hdf5-openmpi.pc (or hdf5-mpich.pc).
> This allows client programs to get libs with 'pkg-config --libs hdf5-mpi'
> without needing to know which specific MPI implementation is being
> used.
>
> It's a good and useful service, I think we should keep it.
>
> But we should document (or fix if possible) that this alternatives
> mechanism is a little fragile, and sometimes the link needs to be
> refresh with
> sudo dpkg-reconfigure libhdf5-openmpi-dev
>
> What I mean is that sometimes the link seem to just disappear, so we get
> $ pkg-config --libs hdf5-mpi
> Package hdf5-mpi was not found in the pkg-config search path.
> Perhaps you should add the directory containing `hdf5-mpi.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'hdf5-mpi' found
>
> It gets restored by 'dpkg-reconfigure libhdf5-openmpi-dev'
> (update-alternative --config hdf5-mpi would also enable it to be reset).
>
> I'm not sure why exactly the link is being lost or if it's feasible to
> make the mechanism for it more robust. I presume it happens when
> openmpi gets updated (e.g. recently updated to openmpi 4.0.4).
> libhdf5-openmpi-dev.postinst of course is setting the alternatives
> link, though I don't understand why the link would be lost just
> because openmpi got upgraded.
>
> Filing this bug so we can document and keep watch on the problem.
> Again, the workaround is to run
>
> sudo dpkg-reconfigure libhdf5-openmpi-dev
>
> (or dpkg-reconfigure libhdf5-mpich-dev)Do you have a scenario leading to this alternative disparition? Thanks, _g.
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