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pkgs/development/compilers/ghc/with-packages.nix: improve recognition of Haskell packages

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Haskell packages -- i.e. packages built by our Cabal builder -- invariably have
the attributes 'pname' and 'version'. We use the absence of these attributes to
recognize non-Haskell packages and filter them from the closed package set
generated by closePropagation. We do this so that the generated Haskell
environment won't contain paths like "/lib/libz.a", which are part of the
closure but have nothing to do with Haskell.

The previous scheme used the attribute 'ghc' to accomplish the same thing, but
unfortunately other packages to contain a 'ghc' attribute, too, like the
old-style ghc-wrapper. Including the ghc-wrapper in this environment is
pointless, obviously. The new approach filters the ghc-wrapper successfully.
This commit is contained in:
Peter Simons 2013-11-07 12:02:47 +01:00
parent a46c71857d
commit 89c566fcfd
1 changed files with 2 additions and 1 deletions
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pkgs/development/compilers/ghc/with-packages.nix
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@ -7,10 +7,11 @@ let
packageDBFlag = if ghc761OrLater then "--package-db" else "--package-conf";
libDir = "$out/lib/ghc-${ghc.version}";
packageCfgDir = "${libDir}/package.conf.d";
isHaskellPkg = x: (x ? pname) && (x ? version);
in
buildEnv {
name = "haskell-env-${ghc.name}";
paths = stdenv.lib.filter (x: x ? ghc) (stdenv.lib.closePropagation packages) ++ [ghc];
paths = stdenv.lib.filter isHaskellPkg (stdenv.lib.closePropagation packages) ++ [ghc];
postBuild = ''
. ${makeWrapper}/nix-support/setup-hook