112 lines
4.5 KiB
Nix
112 lines
4.5 KiB
Nix
{ stdenv, lib, ghc, llvmPackages, packages, buildEnv, makeWrapper
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, ignoreCollisions ? false, withLLVM ? false
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, postBuild ? ""
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, haskellPackages
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}:
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# This wrapper works only with GHC 6.12 or later.
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assert lib.versionOlder "6.12" ghc.version || ghc.isGhcjs;
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# It's probably a good idea to include the library "ghc-paths" in the
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# compiler environment, because we have a specially patched version of
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# that package in Nix that honors these environment variables
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#
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# NIX_GHC
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# NIX_GHCPKG
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# NIX_GHC_DOCDIR
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# NIX_GHC_LIBDIR
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#
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# instead of hard-coding the paths. The wrapper sets these variables
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# appropriately to configure ghc-paths to point back to the wrapper
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# instead of to the pristine GHC package, which doesn't know any of the
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# additional libraries.
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#
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# A good way to import the environment set by the wrapper below into
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# your shell is to add the following snippet to your ~/.bashrc:
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#
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# if [ -e ~/.nix-profile/bin/ghc ]; then
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# eval $(grep export ~/.nix-profile/bin/ghc)
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# fi
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let
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isGhcjs = ghc.isGhcjs or false;
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ghc761OrLater = isGhcjs || lib.versionOlder "7.6.1" ghc.version;
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packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
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ghcCommand' = if isGhcjs then "ghcjs" else "ghc";
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crossPrefix = if (ghc.cross or null) != null then "${ghc.cross.config}-" else "";
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ghcCommand = "${crossPrefix}${ghcCommand'}";
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ghcCommandCaps= lib.toUpper ghcCommand';
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libDir = "$out/lib/${ghcCommand}-${ghc.version}";
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docDir = "$out/share/doc/ghc/html";
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packageCfgDir = "${libDir}/package.conf.d";
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paths = lib.filter (x: x ? isHaskellLibrary) (lib.closePropagation packages);
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hasLibraries = lib.any (x: x.isHaskellLibrary) paths;
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# CLang is needed on Darwin for -fllvm to work:
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# https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/code-generators.html
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llvm = lib.makeBinPath
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([ llvmPackages.llvm ]
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++ lib.optional stdenv.isDarwin llvmPackages.clang);
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in
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if paths == [] && !withLLVM then ghc else
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buildEnv {
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# this makes computing paths from the name attribute impossible;
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# if such a feature is needed, the real compiler name should be saved
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# as a dedicated drv attribute, like `compiler-name`
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name = ghc.name + "-with-packages";
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paths = paths ++ [ghc];
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extraOutputsToInstall = [ "out" "doc" ];
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inherit ignoreCollisions;
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postBuild = ''
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. ${makeWrapper}/nix-support/setup-hook
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# Work around buildEnv sometimes deciding to make bin a symlink
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if test -L "$out/bin"; then
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binTarget="$(readlink -f "$out/bin")"
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rm "$out/bin"
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cp -r "$binTarget" "$out/bin"
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chmod u+w "$out/bin"
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fi
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# wrap compiler executables with correct env variables
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for prg in ${ghcCommand} ${ghcCommand}i ${ghcCommand}-${ghc.version} ${ghcCommand}i-${ghc.version}; do
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if [[ -x "${ghc}/bin/$prg" ]]; then
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
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--add-flags '"-B$NIX_${ghcCommandCaps}_LIBDIR"' \
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--set "NIX_${ghcCommandCaps}" "$out/bin/${ghcCommand}" \
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--set "NIX_${ghcCommandCaps}PKG" "$out/bin/${ghcCommand}-pkg" \
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--set "NIX_${ghcCommandCaps}_DOCDIR" "${docDir}" \
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--set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}" \
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${lib.optionalString withLLVM ''--prefix "PATH" ":" "${llvm}"''}
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fi
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done
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for prg in runghc runhaskell; do
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if [[ -x "${ghc}/bin/$prg" ]]; then
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
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--add-flags "-f $out/bin/${ghcCommand}" \
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--set "NIX_${ghcCommandCaps}" "$out/bin/${ghcCommand}" \
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--set "NIX_${ghcCommandCaps}PKG" "$out/bin/${ghcCommand}-pkg" \
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--set "NIX_${ghcCommandCaps}_DOCDIR" "${docDir}" \
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--set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
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fi
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done
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for prg in ${ghcCommand}-pkg ${ghcCommand}-pkg-${ghc.version}; do
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if [[ -x "${ghc}/bin/$prg" ]]; then
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rm -f $out/bin/$prg
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makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
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fi
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done
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${lib.optionalString hasLibraries "$out/bin/${ghcCommand}-pkg recache"}
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$out/bin/${ghcCommand}-pkg check
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'' + postBuild;
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passthru = {
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preferLocalBuild = true;
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inherit (ghc) version meta;
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inherit haskellPackages;
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};
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}
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