[Dune] Dune and spack

[Dominic Kempf]

Hey Gauthier,

sorry for jumping in late.

Christian has it right here, I was looking into Spack as a way of setting
up our CI and maybe moving towards testing variability in user landscapes
as well. The main reason I stopped working on it was that the following
particularity (some people call it a bug) of the Dune CMake build system
clashes with Spack:
Each Dune module reruns cmake find scripts for dependencies of all Dune
modules it depends on instead of importing the full configuration of the
upstream modules. Due to this behaviour only modules that were built in the
same environment and with the same flags can be safely used together (as
their cmake find scripts found the same things).
For Spack, that means that all variants that you define need to be
redundantly defined across all modules, and dependencies between those need
to be specified manually. That is neither elegant nor feasible in
maintenance.
The Dune developers have voiced their willingness to abandon this
behaviour, but a volunteer to do such a tedious, unrewarding work is yet to
be found.

Best,
Dominic

On Wed, Apr 1, 2020 at 3:29 PM Gauthier Folzan <gauthier.folzan at gmail.com>
wrote:

> Hi Christian,
> here is the link : https://github.com/gauthier12/dune_spack_repo.git
> It is still work in progress and I am still testing so I don't guarantee
> anything but it seems to work on ubuntu, centos and archlinux for
> dune-pyhon with dune-common, dune-geometry, dune-grid, dune-istl and
> dune-uggrid
> Once you have spack installed, installing dune is quite simple, just add
> the repo and install dune
> spack repo add dune_spack_repo
> spack install dune-python
> Cheers
> Gauthier
>
> On Tue, Mar 31, 2020 at 4:46 PM Christian Engwer <
> christian.engwer at uni-muenster.de> wrote:
>
>> Hi Gauthier,
>>
>> welcome to Dune,
>>
>> > Does someone use spack to compile Dune ? If it can be useful to someone,
>> > the spack repo is on github.
>>
>> I think nobody is actively using spack for Dune currently, Dominik had
>> been workin on spack packages... I think his intention was to ease the
>> CI setup.
>>
>> On the other hand, if spack packages are available, it might become
>> more appealing for other people ;-) Can you post a link to your repo?
>>
>> Thanks
>> Christian
>>
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