{ stdenv, ghc, llvmPackages, packages, buildEnv , makeWrapper , ignoreCollisions ? false, withLLVM ? false }: with stdenv.lib; # This wrapper works only with GHC 6.12 or later. assert versionOlder "6.12" ghc.version; # 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 $(grep export ~/.nix-profile/bin/ghc) # fi let ghc761OrLater = ghc.isGhcjs || versionOlder "7.6.1" ghc.version; packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf"; ghcCommand = if ghc.isGhcjs then "ghcjs" else "ghc"; libDir = "$out/lib/${ghcCommand}-${ghc.version}"; docDir = "$out/share/doc/ghc/html"; packageCfgDir = "${libDir}/package.conf.d"; paths = filter (x: x ? isHaskellLibrary) (closePropagation packages); hasLibraries = 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 = makeSearchPath "bin" ([ llvmPackages.llvm ] ++ 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 ${optionalString ghc.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}" \ ${optionalString withLLVM ''--prefix "PATH" ":" "${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 ${optionalString hasLibraries "$out/bin/${ghcCommand}-pkg recache"} $out/bin/${ghcCommand}-pkg check ''; } // { preferLocalBuild = true; inherit (ghc) version meta; }