[Nix-dev] ghcWithPackages

[Mateusz Kowalczyk]

On 08/18/2014 02:43 PM, Tim Barbour wrote:
> It seems that some versions of haskellPackages define ghcWithPackages, and
> others do not.
> 
> I have been following the approach described at
> 
>    https://nixos.org/wiki/Haskell#Using_cabal_in_the_direct_installation_scenario
> 
> under the heading "Local use via Nixpkgs config".
> 
> If I use haskellPackages.ghcWithPackages with yi in the list of packages, I get
> 
> installing `haskell-env-ghc-7.6.3'
> these derivations will be built:
>   /nix/store/3n7dzh6c1idpjbq27wzds0784i200kpi-haskell-env-ghc-7.6.3.drv
>   /nix/store/7kbz46k29gxgx67lxs2fymk3crkd0q1d-haskell-yi-ghc7.6.3-0.8.1.drv
> ...
> 
>   60% (  9 / 15) in 'Yi.Command'
> haddock: panic! (the 'impossible' happened)
>   (GHC version 7.6.3 for x86_64-unknown-linux):
> 	mkWWcpr: not a product
> <<details unavailable>>
> 
> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
> 
> builder for `/nix/store/7kbz46k29gxgx67lxs2fymk3crkd0q1d-haskell-yi-ghc7.6.3-0.8.1.drv' failed with exit code 1
> cannot build derivation `/nix/store/3n7dzh6c1idpjbq27wzds0784i200kpi-haskell-env-ghc-7.6.3.drv': 1 dependencies couldn't be built
> error: build of `/nix/store/3n7dzh6c1idpjbq27wzds0784i200kpi-haskell-env-ghc-7.6.3.drv' failed
>
> 
> which looks very similar to this bug:
> 
>    https://ghc.haskell.org/trac/ghc/ticket/9170
> 
> Since the bug is supposed to be fixed in ghc >= 7.8.2, I would like to use a newer version of
> haskellPackages. But if I try haskellPackages_ghc783.ghcWithPackages, I get 
> 

Yes, known bug but not the one I'm going to fix. I think we should
simply change the Yi expression to not build docs when using 7.6.3.

>  error: attribute `haskellPackages_ghc783.ghcWithPackages' missing
> 
> OTOH, haskellPackages_ghc742.ghcWithPackages has no such error.
> 
> It seems that some versions of haskellPackages define ghcWithPackages, and
> others do not. Why ? What is the right way to specify a particular version of
> ghc ? Or better still, avoid a given version of ghc ?

haskellPackages_ghc783.ghcWithPackages should work just fine, I just
tried it myself. Considering haskellPackages.ghcWithPackages gives you
7.6.3, it simply makes me think that you have an old set of packages. On
nixos-unstable/nixpkgs-unstable, that would default to 7.8.3 and
haskellPackages_ghc783.ghcWithPackages would work fine. That's what I
use in my configuration.nix myself: I'm using nixos-unstable channel.

> Tim
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-- 
Mateusz K.