nixpkgs/pkgs/development/compilers/ghc/with-packages.nix
Peter Simons f92a5cbfc6 pkgs/development/compilers/ghc/with-packages.nix: add 'ignoreCollisions' parameter
The ghcWithPackage expression now has an argument 'ignoreCollisions' that
allows users to disable the path collision check like so:

  (pkgs.haskellPackages.ghcWithPackages (pkgs: with pkgs; [ haskellPlatform ])).override { ignoreCollisions = true; };

See d64917ad17
for a long and detailed discussion of why these path collisions may occur.
2013-11-07 12:14:19 +01:00

45 lines
1.5 KiB
Nix

{ stdenv, ghc, packages, buildEnv, makeWrapper, ignoreCollisions ? false }:
assert packages != [];
let
ghc761OrLater = stdenv.lib.versionOlder "7.6.1" ghc.version;
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 isHaskellPkg (stdenv.lib.closePropagation packages) ++ [ghc];
inherit ignoreCollisions;
postBuild = ''
. ${makeWrapper}/nix-support/setup-hook
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags '"-B$NIX_GHC_LIBDIR"' \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in runghc runhaskell; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags "-f $out/bin/ghc" \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in ghc-pkg ghc-pkg-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag} ${packageCfgDir}"
done
$out/bin/ghc-pkg recache
'';
}