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ghcWithPackages: don't re-generate the packages.conf.d cache if there are no actual libraries added to the environment

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This change resolves https://github.com/NixOS/nixpkgs/issues/6419.
This commit is contained in:
Peter Simons 2015-02-22 20:43:40 +01:00
parent 5d5b51dfc0
commit aeadb16444
1 changed files with 3 additions and 3 deletions
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6
pkgs/development/haskell-modules/with-packages-wrapper.nix
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@ -30,8 +30,8 @@ let
libDir = "$out/lib/ghc-${ghc.version}";
docDir = "$out/share/doc/ghc/html";
packageCfgDir = "${libDir}/package.conf.d";
isHaskellPkg = x: (x ? pname) && (x ? version) && (x ? env);
paths = stdenv.lib.filter isHaskellPkg (stdenv.lib.closePropagation packages);
paths = stdenv.lib.filter (x: x ? isHaskellLibrary) (stdenv.lib.closePropagation packages);
hasLibraries = stdenv.lib.any (x: x.isHaskellLibrary) paths;
in
if paths == [] then ghc else
buildEnv {
@ -73,7 +73,7 @@ buildEnv {
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
done
$out/bin/ghc-pkg recache
${stdenv.lib.optionalString hasLibraries "$out/bin/ghc-pkg recache"}
$out/bin/ghc-pkg check
'';
} // {