forked from mirrors/nixpkgs
50f256f5ef
Since GHC now will have LLVM available when needed, we don't need to add it in the wrapper anymore. It can still be added if NCG is available, but -fllvm should be used (e. g. to work around an NCG bug).
157 lines
6.6 KiB
Nix
157 lines
6.6 KiB
Nix
{ lib, stdenv, ghc, llvmPackages, packages, symlinkJoin, makeWrapper
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# GHC will have LLVM available if necessary for the respective target,
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# so useLLVM only needs to be changed if -fllvm is to be used for a
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# platform that has NCG support
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, useLLVM ? false
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, postBuild ? ""
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, ghcLibdir ? null # only used by ghcjs, when resolving plugins
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}:
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assert ghcLibdir != null -> (ghc.isGhcjs or false);
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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 || ghc.isHaLVM;
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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 $(grep export ~/.nix-profile/bin/ghc)
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# fi
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let
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isGhcjs = ghc.isGhcjs or false;
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isHaLVM = ghc.isHaLVM or false;
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ghc761OrLater = isGhcjs || isHaLVM || lib.versionOlder "7.6.1" ghc.version;
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packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
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ghcCommand' = if isGhcjs then "ghcjs" else "ghc";
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ghcCommand = "${ghc.targetPrefix}${ghcCommand'}";
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ghcCommandCaps= lib.toUpper ghcCommand';
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libDir = if isHaLVM then "$out/lib/HaLVM-${ghc.version}"
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else "$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/codegens.html#llvm-code-generator-fllvm
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llvm = lib.makeBinPath
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([ llvmPackages.llvm ]
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++ lib.optional stdenv.targetPlatform.isDarwin llvmPackages.clang);
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in
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if paths == [] && !useLLVM then ghc else
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symlinkJoin {
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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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nativeBuildInputs = [ makeWrapper ];
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postBuild = ''
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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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${lib.optionalString (ghc.isGhcjs or false)
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''--set NODE_PATH "${ghc.socket-io}/lib/node_modules"''
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} \
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${lib.optionalString useLLVM ''--prefix "PATH" ":" "${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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# haddock was referring to the base ghc, https://github.com/NixOS/nixpkgs/issues/36976
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if [[ -x "${ghc}/bin/haddock" ]]; then
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rm -f $out/bin/haddock
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makeWrapper ${ghc}/bin/haddock $out/bin/haddock \
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--add-flags '"-B$NIX_${ghcCommandCaps}_LIBDIR"' \
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--set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
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fi
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'' + (lib.optionalString (stdenv.targetPlatform.isDarwin && !isGhcjs && !stdenv.targetPlatform.isiOS) ''
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# Work around a linker limit in macOS Sierra (see generic-builder.nix):
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local packageConfDir="$out/lib/${ghc.name}/package.conf.d";
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local dynamicLinksDir="$out/lib/links"
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mkdir -p $dynamicLinksDir
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# Clean up the old links that may have been (transitively) included by
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# symlinkJoin:
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rm -f $dynamicLinksDir/*
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for d in $(grep -Poz "dynamic-library-dirs:\s*\K .+\n" $packageConfDir/*|awk '{print $2}'|sort -u); do
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ln -s $d/*.dylib $dynamicLinksDir
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done
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for f in $packageConfDir/*.conf; do
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# Initially, $f is a symlink to a read-only file in one of the inputs
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# (as a result of this symlinkJoin derivation).
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# Replace it with a copy whose dynamic-library-dirs points to
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# $dynamicLinksDir
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cp $f $f-tmp
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rm $f
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sed "N;s,dynamic-library-dirs:\s*.*,dynamic-library-dirs: $dynamicLinksDir," $f-tmp > $f
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rm $f-tmp
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done
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'') + ''
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${lib.optionalString hasLibraries ''
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# GHC 8.10 changes.
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# Instead of replacing package.cache[.lock] with the new file,
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# ghc-pkg is now trying to open the file. These file are symlink
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# to another nix derivation, so they are not writable. Removing
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# them allow the correct behavior of ghc-pkg recache
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# See: https://github.com/NixOS/nixpkgs/issues/79441
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rm $out/lib/${ghc.name}/package.conf.d/package.cache.lock
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rm $out/lib/${ghc.name}/package.conf.d/package.cache
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$out/bin/${ghcCommand}-pkg recache
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''}
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${# ghcjs will read the ghc_libdir file when resolving plugins.
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lib.optionalString (isGhcjs && ghcLibdir != null) ''
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mkdir -p "${libDir}"
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rm -f "${libDir}/ghc_libdir"
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printf '%s' '${ghcLibdir}' > "${libDir}/ghc_libdir"
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''}
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$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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};
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}
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