[Nix-dev] Haskell build failures

[Luca Bruno]

Yes, that's very similar to what iElectric & co are going to do for python.
I suggest a meta.pythonVersions and meta.ghcVersions, and so on.


On Fri, Aug 8, 2014 at 9:29 PM, Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk>
wrote:

> On 08/08/2014 09:19 PM, Peter Simons wrote:
> > Hi Daniel,
> >
> >  > Nix includes several versions of GHC, and one of the few cases where
> >  > we include multiple versions of a Haskell library is when that library
> >  > ships with GHC or Haskell Platform. Eg, 10 versions of HTTP, 9
> >  > versions of GLUT.
> >  >
> >  > We end up telling Hydra to build every version of the library against
> >  > every version of GHC, when what we actually want is to pick a library
> >  > version based on the GHC version. (With maybe some overlap.)
> >
> > yes, exactly, that is the problem we have. We keep old versions of
> > libraries around because we need them to support, say GHC 6.12.3 or an
> > old Haskell Platform, but newer compilers cannot build those packages
> > any more. Still, Hydra tries to build every single package in
> > haskell-packages.nix with the latest compiler. Ideally, Hydra would
> > build no Haskell package that has a version number as part of its
> > attribute name. For example, Hydra should build HTTP, but not
> > HTTP_4000_0_6, HTTP_4000_0_9, HTTP_4000_1_1, and so on.
> >
> > Furthermore, Hydra builds the Haskell package set in 4 separate copies:
> >
> >   haskellPackages_ghc783_no_profiling
> >   haskellPackages_ghc783_profiling
> >   haskellPackages_ghc783
> >   haskellPackages
> >
> > This means that every failing package contributes 4 build errors to the
> > statistics.
> >
> > Of course, we have also our fair share of packages that are just plain
> > broken. I'm sure many packages that worked with GHC 7.0.4 have
> > bit-rotted away by now, but nobody notices because the package is
> > obsolete anyway.
> >
> > Just my 2 cents,
> > Peter
> >
> > _______________________________________________
> > nix-dev mailing list
> > nix-dev at lists.science.uu.nl
> > http://lists.science.uu.nl/mailman/listinfo/nix-dev
> >
>
> Can we not add a field to the Haskell expressions that's akin to the
> usual ‘platforms’ field? If we know that somePackage_0_1_old doesn't
> compile from 7.2 onwards, perhaps we could tell Hydra not to build it
> with newer compilers. Seems like it would make a lot of breakage disappear.
>
> --
> Mateusz K.
> _______________________________________________
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> nix-dev at lists.science.uu.nl
> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>



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