[Nix-dev] A Journey into the Haskell NG infrastructure: Part I

[Kirill Elagin]

Hm, thanks, this works indeed!
But how is this different from `nix-shell '<nixpkgs>' -A
haskell-ng.compiler.ghc763` (I probably missed something in `nix-shell`
usage)?

Here is another strange thing I found: whenever I have something like

~~~~
testHaskell = haskell-ng.packages.ghc784.ghcWithPackages (hp: []);
~~~~

in my `config.nix`, it starts to build ghc:

~~~~
› nix-shell '<nixpkgs>' -A testHaskell
these derivations will be built:
  /nix/store/s898z43nkjpzcizhcxcd71al9qd7plkh-ghc-7.8.4-src.tar.xz.drv
these paths will be fetched (73.48 MiB download, 862.92 MiB unpacked):
  /nix/store/w4il8kp2jhmhmaxplx7i04y838k583mk-ghc-7.4.2-binary
building path(s)
‘/nix/store/s1nidyhd42i61lfb19s77rnb4anip4w8-ghc-7.8.4-src.tar.xz’
~~~~

But if I add any single package to the list in `ghcWithPackages` it is no
longer building anything.


On Fri Feb 13 2015 at 1:39:07 AM Peter Simons <simons at cryp.to> wrote:

> Hi Kirill,
>
>  > How do I run a nix-shell with a specific version of ghc installed?
>
>  $ nix-shell -p haskell-ng.compiler.ghc763
>
> I hope this helps,
> Peter
>
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