Drew Parsons a écrit le 18/03/2020 à 11:32 : > On 2020-03-18 17:42, Gilles Filippini wrote: >> Gilles Filippini a écrit le 17/03/2020 à 17:59 : >>> >>> As I understand it now, this is do-able if and only if there is a way to >>> add a slave to an existing alternative. But I can't find such a way. Any >>> idea? > > Looks like you got an idea before I did on how to do it before I do :)
Well, this is quite cumbersome: parse the existing alternatives using
'u-a --query mpi' then reinstall the whole alternative plus (or minus)
the (un)wanted '--slave' part.
>> I'm almost done, but there is a corner case we have to accept. When:
>> 1- Default MPI toolchain for the arch is installed
>> 2- The selected 'mpi' alternative points to this default MPI toolchain
>> 3- The libhdf5-<mpi>-dev flavor for this default toolchain is NOT
>> installed
>> 4- Another libhdf5-<mpi>-dev flavor is installed
>> Then the hdf5-mpi.pc slave points to nothing until one of these
>> conditions is satisfied:
>> * The libhdf5-<mpi>-dev flavor for this default toolchain is installed
>> or
>> * The 'mpi' alternative points to the MPI flavor corresponding to the
>> installed libhdf5-<mpi>-dev.
>>
>> Do we agree?
>
>
> That sounds perfectly reasonable.
>
> That scenario is odd, and very specific. It means the system
> administrator has deliberately chosen to not install the preferred
> hdf5-<preferred_mpi> and to install the non-preferred
> hdf5-<nonpreferred_mpi> instead ("preferred" in the mpi alternatives
> sense).
>
> In those conditions it's reasonable that users of that system should
> need to be specific about which hdf5-mpi they're using, invoking
> "pkg-config --cflags hdf5-<nonpreferred_mpi>" rather than "pkg-config
> --cflags hdf5-mpi". Their system administrator can still configure
> their preferred hdf5 so they can use "pkg-config --cflags hdf5" to
> access their hdf5-<nonpreferred_mpi>, if they want.
OK. I'll upload soon to experimental.
> Thanks for sorting through the alternatives logic.
I learned things :)
Best,
_g.
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