nixpkgs/pkgs/development/compilers/ghc/with-packages.nix
Andres Loeh d068aa9861 Patch ghc-paths to interact better with ghcWithPackages.
When the ghc-paths library is compiled, the paths of the
compiler it is compiled with are being hardcoded in the
library (and can then be queried from other applications
using the library).

But on Nix, packages are compiled with ghc-wrapper, and
subsequently possibly used with a special version of ghc
generated for a particular environment of packages. So
one version of ghc-paths may potentially end up being
used by lots of different instances of ghc. The hardcoding
approach fails.

As a work-around, we now patch ghc-paths so that it allows
setting the paths that can be queried via environment
variables. Specific GHC environments can then set these
environment variables in the wrapper shell script that
invokes GHC.

This should at least partially solve issue #213.
2012-12-16 14:25:15 +01:00

111 lines
3 KiB
Nix

{stdenv, ghc, packages ? [], makeWrapper}:
stdenv.mkDerivation rec {
name = "haskell-env-${ghc.name}";
allPackages = stdenv.lib.closePropagation packages;
buildInputs = allPackages ++ [makeWrapper];
propagatedBuildInputs = packages;
unpackPhase = "true";
installPhase = ''
numversion=$(${ghc}/bin/ghc --numeric-version)
majorversion=''${numversion%%.*}
minorversion=''${numversion#*.}
minorversion=''${minorversion%%.*}
if [[ $majorversion -gt 6 ]] && [[ $minorversion -gt 4 ]]; then
globalConf="--global-package-db"
else
globalConf="--global-conf"
fi
originalTopDir="${ghc}/lib/ghc-${ghc.version}"
originalPkgDir="$originalTopDir/package.conf.d"
linkedTopDir="$out/lib"
linkedPkgDir="$linkedTopDir/package.conf.d"
mkdir -p $out/bin
mkdir -p $linkedTopDir
mkdir -p $linkedPkgDir
echo "Linking GHC core libraries:"
echo -n "Linking $originalTopDir "
for f in "$originalTopDir/"*; do
if test -f $f; then
ln -s $f $linkedTopDir
echo -n .
fi
done
echo
echo -n "Linking $originalPkgDir "
for f in "$originalPkgDir/"*.conf; do
ln -s $f $linkedPkgDir
echo -n .
done
echo
echo "Linking selected packages and dependencies:"
for currentPath in ${stdenv.lib.concatStringsSep " " allPackages}; do
currentPkgDir="$currentPath/lib/ghc-pkgs/ghc-${ghc.version}"
# Check if current path is a Cabal package for the current GHC
if test -d $currentPkgDir; then
echo -n "Linking $currentPath "
for f in "$currentPath/bin/"*; do
ln -s $f $out/bin
echo -n .
done
for f in "$currentPath/etc/bash_completion.d/"*; do
mkdir -p $out/etc/bash_completion.d
ln -s $f $out/etc/bash_completion.d/
echo -n .
done
for f in "$currentPkgDir/"*.conf; do
ln -s $f $linkedPkgDir
echo -n .
done
echo
fi
done
echo -n "Generating package cache "
${ghc}/bin/ghc-pkg $globalConf $linkedPkgDir recache
echo .
echo -n "Generating wrappers "
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
# The NIX env-vars are picked up by our patched version of ghc-paths.
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags "-B$linkedTopDir" \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_LIBDIR" "$linkedTopDir"
echo -n .
done
for prg in runghc runhaskell; do
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "-f $out/bin/ghc"
echo -n .
done
for prg in ghc-pkg ghc-pkg-${ghc.version}; do
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "$globalConf $linkedPkgDir"
echo -n .
done
for prg in hp2ps hpc hasktags hsc2hs haddock haddock-${ghc.version}; do
if test -x ${ghc}/bin/$prg -a ! -x $out/bin/$prg; then
ln -s ${ghc}/bin/$prg $out/bin/$prg && echo -n .
fi
done
echo
'';
meta = ghc.meta;
}