183 lines
7.5 KiB
Nix
183 lines
7.5 KiB
Nix
{ lib, stdenv, haskellPackages, 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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, withHoogle ? false
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, hoogleWithPackages
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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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# This argument is a function which selects a list of Haskell packages from any
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# passed Haskell package set.
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#
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# Example:
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# (hpkgs: [ hpkgs.mtl hpkgs.lens ])
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selectPackages:
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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 $(grep export ~/.nix-profile/bin/ghc)
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# fi
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let
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inherit (haskellPackages) llvmPackages ghc;
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packages = selectPackages haskellPackages
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++ lib.optional withHoogle (hoogleWithPackages selectPackages);
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isGhcjs = ghc.isGhcjs or false;
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isHaLVM = ghc.isHaLVM or false;
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ghc761OrLater = isGhcjs || isHaLVM || lib.versionOlder "7.6.1" ghc.version;
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packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
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ghcCommand' = if isGhcjs then "ghcjs" else "ghc";
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ghcCommand = "${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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assert ghcLibdir != null -> (ghc.isGhcjs or false);
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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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# Inform users about backwards incompatibilities with <= 21.05
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override = _: throw ''
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The ghc.withPackages wrapper itself can now be overridden, but no longer
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the result of calling it (as before). Consequently overrides need to be
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adjusted: Instead of
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(ghc.withPackages (p: [ p.my-package ])).override { withLLLVM = true; }
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use
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(ghc.withPackages.override { useLLVM = true; }) (p: [ p.my-package ])
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Also note that withLLVM has been renamed to useLLVM for consistency with
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the GHC Nix expressions.'';
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};
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}
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