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{ stdenv, lib, ghc, llvmPackages, packages, buildEnv, makeWrapper
, ignoreCollisions ? false, withLLVM ? false
, postBuild ? ""
}:
# This wrapper works only with GHC 6.12 or later.
assert lib.versionOlder "6.12" ghc.version || ghc.isGhcjs;
# It's probably a good idea to include the library "ghc-paths" in the
# compiler environment, because we have a specially patched version of
# that package in Nix that honors these environment variables
#
# NIX_GHC
# NIX_GHCPKG
# NIX_GHC_DOCDIR
# NIX_GHC_LIBDIR
#
# instead of hard-coding the paths. The wrapper sets these variables
# appropriately to configure ghc-paths to point back to the wrapper
# instead of to the pristine GHC package, which doesn't know any of the
# additional libraries.
#
# A good way to import the environment set by the wrapper below into
# your shell is to add the following snippet to your ~/.bashrc:
#
# if [ -e ~/.nix-profile/bin/ghc ]; then
# eval $(grep export ~/.nix-profile/bin/ghc)
# fi
let
isGhcjs = ghc.isGhcjs or false;
ghc761OrLater = isGhcjs || lib.versionOlder "7.6.1" ghc.version;
packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
ghcCommand = if isGhcjs then "ghcjs" else "ghc";
libDir = "$out/lib/${ghcCommand}-${ghc.version}";
docDir = "$out/share/doc/ghc/html";
packageCfgDir = "${libDir}/package.conf.d";
paths = lib.filter (x: x ? isHaskellLibrary) (lib.closePropagation packages);
hasLibraries = lib.any (x: x.isHaskellLibrary) paths;
# CLang is needed on Darwin for -fllvm to work:
# https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/code-generators.html
llvm = lib.makeSearchPath "bin"
([ llvmPackages.llvm ]
++ lib.optional stdenv.isDarwin llvmPackages.clang);
in
if paths == [] && !withLLVM then ghc else
buildEnv {
inherit (ghc) name;
paths = paths ++ [ghc];
inherit ignoreCollisions;
postBuild = ''
. ${makeWrapper}/nix-support/setup-hook
${lib.optionalString isGhcjs ''
cp -r "${ghc}/${ghc.libDir}/"* ${libDir}/
''}
if test -L "$out/bin"; then
binTarget="$(readlink -f "$out/bin")"
rm "$out/bin"
cp -r "$binTarget" "$out/bin"
chmod u+w "$out/bin"
fi
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/${ghcCommand}" \
--set "NIX_GHCPKG" "$out/bin/${ghcCommand}-pkg" \
--set "NIX_GHC_DOCDIR" "${docDir}" \
--set "NIX_GHC_LIBDIR" "${libDir}" \
${lib.optionalString withLLVM ''--prefix "PATH" ":" "${llvm}"''}
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/${ghcCommand}" \
--set "NIX_GHCPKG" "$out/bin/${ghcCommand}-pkg" \
--set "NIX_GHC_DOCDIR" "${docDir}" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in ${ghcCommand}-pkg ${ghcCommand}-pkg-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
done
${lib.optionalString hasLibraries "$out/bin/${ghcCommand}-pkg recache"}
$out/bin/${ghcCommand}-pkg check
'' + postBuild;
} // {
preferLocalBuild = true;
inherit (ghc) version meta;
}
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