Reduce the number of derivations

build.nix

@@ -25,6 +25,7 @@ in rec {
   tools = pkgs.lib.optionalAttrs (ifdLevel >= 3) (
     pkgs.recurseIntoAttrs ({
       cabal-latest = tool compiler-nix-name "cabal" { inherit evalPackages; };
+      stack = tool compiler-nix-name "stack" { version = "2.9.1"; inherit evalPackages; };
       hlint-latest = tool compiler-nix-name "hlint" {
         inherit evalPackages;
         version = {

builder/comp-builder.nix

@@ -1,4 +1,4 @@
-{ pkgs, stdenv, buildPackages, ghc, lib, gobject-introspection ? null, haskellLib, makeConfigFiles, haddockBuilder, ghcForComponent, hsPkgs, compiler, runCommand, libffi, gmp, zlib, ncurses, nodejs }@defaults:
+{ pkgs, stdenv, buildPackages, ghc, lib, gobject-introspection ? null, haskellLib, makeConfigFiles, haddockBuilder, ghcForComponent, hsPkgs, compiler, runCommand, libffi, gmp, zlib, ncurses, nodejs, nonReinstallablePkgs }@defaults:
 lib.makeOverridable (
 let self =
 { componentId
@@ -162,7 +162,7 @@ let
       if configureAllComponents
         then ["--enable-tests" "--enable-benchmarks"]
         else ["${haskellLib.componentTarget componentId}"]
-    ) ++ [ "$(cat ${configFiles}/configure-flags)"
+    ) ++ [ "$(cat $configFiles/configure-flags)"
     ] ++ commonConfigureFlags);
 
   # From nixpkgs 20.09, the pkg-config exe has a prefix matching the ghc one
@@ -343,9 +343,9 @@ let
       config = component;
       srcSubDir = cleanSrc.subDir;
       srcSubDirPath = cleanSrc.root + cleanSrc.subDir;
-      inherit configFiles executableToolDepends exeName enableDWARF;
+      inherit executableToolDepends exeName enableDWARF;
       exePath = drv + "/bin/${exeName}";
-      env = shellWrappers;
+      env = shellWrappers.drv;
       profiled = self (drvArgs // { enableLibraryProfiling = true; });
       dwarf = self (drvArgs // { enableDWARF = true; });
     } // lib.optionalAttrs (haskellLib.isLibrary componentId) ({
@@ -377,19 +377,22 @@ let
       # Not sure why pkgconfig needs to be propagatedBuildInputs but
       # for gi-gtk-hs it seems to help.
       ++ map pkgs.lib.getDev (builtins.concatLists pkgconfig)
+      # These only need to be propagated for library components (otherwise they
+      # will be in `buildInputs`)
+      ++ lib.optionals (haskellLib.isLibrary componentId) configFiles.libDeps
       ++ lib.optionals (stdenv.hostPlatform.isWindows)
-        (lib.flatten component.libs
-        ++ map haskellLib.dependToLib component.depends);
+        (lib.flatten component.libs);
 
-    buildInputs = lib.optionals (!stdenv.hostPlatform.isWindows)
-      (lib.flatten component.libs
-      ++ map haskellLib.dependToLib component.depends);
+    buildInputs =
+      lib.optionals (!haskellLib.isLibrary componentId) configFiles.libDeps
+      ++ lib.optionals (!stdenv.hostPlatform.isWindows)
+        (lib.flatten component.libs);
 
     nativeBuildInputs =
-      [shellWrappers buildPackages.removeReferencesTo]
+      [ghc buildPackages.removeReferencesTo]
       ++ executableToolDepends;
 
-    outputs = ["out" ]
+    outputs = ["out" "configFiles" "ghc"]
       ++ (lib.optional enableSeparateDataOutput "data")
       ++ (lib.optional keepSource "source")
       ++ (lib.optional writeHieFiles "hie");
@@ -409,6 +412,18 @@ let
       '') + commonAttrs.prePatch;
 
     configurePhase = ''
+      mkdir -p $configFiles
+      mkdir -p $ghc
+      wrappedGhc=$ghc
+      ${configFiles.script}
+      ${shellWrappers.script}
+    ''
+    # Remove any ghc docs pages so nixpkgs does not include them in $out
+    # (this can result in unwanted dependencies on GHC)
+    + ''
+      rm -rf $wrappedGhc/share/doc $wrappedGhc/share/man $wrappedGhc/share/devhelp/books
+      PATH=$wrappedGhc/bin:$PATH
+
       runHook preConfigure
       echo Configure flags:
       printf "%q " ${finalConfigureFlags}
@@ -470,7 +485,7 @@ let
       ${lib.optionalString (haskellLib.isLibrary componentId) ''
         $SETUP_HS register --gen-pkg-config=${name}.conf
         ${ghc.targetPrefix}ghc-pkg -v0 init $out/package.conf.d
-        ${ghc.targetPrefix}ghc-pkg -v0 --package-db ${configFiles}/${configFiles.packageCfgDir} -f $out/package.conf.d register ${name}.conf
+        ${ghc.targetPrefix}ghc-pkg -v0 --package-db $configFiles/${configFiles.packageCfgDir} -f $out/package.conf.d register ${name}.conf
 
         mkdir -p $out/exactDep
         touch $out/exactDep/configure-flags
@@ -502,6 +517,7 @@ let
               if id=$(${target-pkg-and-db} field "z-${package.identifier.name}-z-*" id --simple-output); then
                 name=$(${target-pkg-and-db} field "z-${package.identifier.name}-z-*" name --simple-output)
                 echo "--dependency=''${name#z-${package.identifier.name}-z-}=$id" >> $out/exactDep/configure-flags
+                echo "package-id $id" >> $out/envDep
                 ''
                 # Allow `package-name:sublib-name` to work in `build-depends`
                 # by adding the same `--dependency` again, but with the package
@@ -593,7 +609,7 @@ let
     '';
 
     shellHook = ''
-      export PATH="${shellWrappers}/bin:$PATH"
+      export PATH=$ghc/bin:$PATH
       ${shellHookApplied}
     '';
   }

builder/default.nix

@@ -3,7 +3,7 @@
 let
   # Builds a single component of a package.
   comp-builder = haskellLib.weakCallPackage pkgs ./comp-builder.nix {
-    inherit ghc haskellLib makeConfigFiles haddockBuilder ghcForComponent hsPkgs compiler;
+    inherit ghc haskellLib makeConfigFiles haddockBuilder ghcForComponent hsPkgs compiler nonReinstallablePkgs;
   };
 
   haddockBuilder = haskellLib.weakCallPackage pkgs ./haddock-builder.nix {
@@ -44,7 +44,11 @@ let
 
 
   hoogleLocal = let
-    nixpkgsHoogle = import (pkgs.path + /pkgs/development/haskell-modules/hoogle.nix);
+    # Use hoogle.nix from at least nixpkgs 22.05
+    nixpkgs = if lib.versionAtLeast lib.trivial.release "22.05"
+      then pkgs.path
+      else pkgs.haskell-nix.sources.nixpkgs-2205;
+    nixpkgsHoogle = import (nixpkgs + /pkgs/development/haskell-modules/hoogle.nix);
   in { packages ? [], hoogle ? pkgs.buildPackages.haskell-nix.tool "ghc8107" "hoogle" {
         inherit evalPackages;
         version = "5.0.18.3";
@@ -59,11 +63,9 @@ let
           else ghc;
         inherit packages hoogle;
       };
-    in if lib.versionAtLeast lib.trivial.release "22.05"
-      then haskellLib.weakCallPackage pkgs nixpkgsHoogle {
-          inherit haskellPackages;
-        } (p: p.packages)
-      else haskellLib.weakCallPackage pkgs nixpkgsHoogle haskellPackages;
+    in haskellLib.weakCallPackage pkgs nixpkgsHoogle {
+      inherit haskellPackages;
+    } (p: p.packages);
 
   # Same as haskellPackages.shellFor in nixpkgs.
   shellFor = haskellLib.weakCallPackage pkgs ./shell-for.nix {

builder/ghc-for-component-wrapper.nix

@@ -20,50 +20,42 @@ let
   ghc = if enableDWARF then defaults.ghc.dwarf else defaults.ghc;
 
   inherit (configFiles) targetPrefix ghcCommand ghcCommandCaps packageCfgDir;
-  libDir         = "$out/${configFiles.libDir}";
-  docDir         = "$out/share/doc/ghc/html";
+  libDir         = "$wrappedGhc/${configFiles.libDir}";
+  docDir         = "$wrappedGhc/share/doc/ghc/html";
   # For musl we can use haddock from the buildGHC
   haddock        = if stdenv.hostPlatform.isLinux && stdenv.targetPlatform.isMusl && !haskellLib.isNativeMusl
     then ghc.buildGHC
     else ghc;
 
-in runCommand "${componentName}-${ghc.name}-env" {
-  preferLocalBuild = true;
-  passthru = {
-    inherit (ghc) version meta;
-    inherit targetPrefix;
-    baseGhc = ghc;
-  };
-} (
-  ''
+  script = ''
     . ${makeWrapper}/nix-support/setup-hook
 
   ''
   # Start with a ghc and remove all of the package directories
   + ''
-    mkdir -p $out/bin
-    ${lndir}/bin/lndir -silent ${ghc} $out
+    mkdir -p $wrappedGhc/bin
+    ${lndir}/bin/lndir -silent $unwrappedGhc $wrappedGhc
     rm -rf ${libDir}/*/
   ''
   # ... but retain the lib/ghc/bin directory. This contains `unlit' and friends.
   + ''
-    ln -s ${ghc}/lib/${ghcCommand}-${ghc.version}/bin ${libDir}
+    ln -s $unwrappedGhc/lib/${ghcCommand}-${ghc.version}/bin ${libDir}
   ''
   # ... and the ghcjs shim's if they are available ...
   + ''
-    if [ -d ${ghc}/lib/${ghcCommand}-${ghc.version}/shims ]; then
-      ln -s ${ghc}/lib/${ghcCommand}-${ghc.version}/shims ${libDir}
+    if [ -d $unwrappedGhc/lib/${ghcCommand}-${ghc.version}/shims ]; then
+      ln -s $unwrappedGhc/lib/${ghcCommand}-${ghc.version}/shims ${libDir}
     fi
   ''
   # ... and node modules ...
   + ''
-    if [ -d ${ghc}/lib/${ghcCommand}-${ghc.version}/ghcjs-node ]; then
-      ln -s ${ghc}/lib/${ghcCommand}-${ghc.version}/ghcjs-node ${libDir}
+    if [ -d $unwrappedGhc/lib/${ghcCommand}-${ghc.version}/ghcjs-node ]; then
+      ln -s $unwrappedGhc/lib/${ghcCommand}-${ghc.version}/ghcjs-node ${libDir}
     fi
   ''
   # Replace the package database with the one from target package config.
   + ''
-    ln -s ${configFiles}/${packageCfgDir} $out/${packageCfgDir}
+    ln -s $configFiles/${packageCfgDir} $wrappedGhc/${packageCfgDir}
 
   ''
   # Set the GHC_PLUGINS environment variable according to the plugins for the component.
@@ -77,9 +69,9 @@ in runCommand "${componentName}-${ghc.name}-env" {
     GHC_PLUGINS="["
     LIST_PREFIX=""
     ${builtins.concatStringsSep "\n" (map (plugin: ''
-      id=$(${ghc}/bin/ghc-pkg --package-db ${plugin.library}/package.conf.d field ${plugin.library.package.identifier.name} id --simple-output)
-      lib_dir=$(${ghc}/bin/ghc-pkg --package-db ${plugin.library}/package.conf.d field ${plugin.library.package.identifier.name} dynamic-library-dirs --simple-output)
-      lib_base=$(${ghc}/bin/ghc-pkg --package-db ${plugin.library}/package.conf.d field ${plugin.library.package.identifier.name} hs-libraries --simple-output)
+      id=$($unwrappedGhc/bin/ghc-pkg --package-db ${plugin.library}/package.conf.d field ${plugin.library.package.identifier.name} id --simple-output)
+      lib_dir=$($unwrappedGhc/bin/ghc-pkg --package-db ${plugin.library}/package.conf.d field ${plugin.library.package.identifier.name} dynamic-library-dirs --simple-output)
+      lib_base=$($unwrappedGhc/bin/ghc-pkg --package-db ${plugin.library}/package.conf.d field ${plugin.library.package.identifier.name} hs-libraries --simple-output)
       lib="$(echo ''${lib_dir}/lib''${lib_base}*)"
       GHC_PLUGINS="''${GHC_PLUGINS}''${LIST_PREFIX}(\"''${lib}\",\"''${id}\",\"${plugin.moduleName}\",["
       LIST_PREFIX=""
@@ -103,25 +95,25 @@ in runCommand "${componentName}-${ghc.name}-env" {
   # The NIX_ variables are used by the patched Paths_ghc module.
   + ''
     for prg in ${ghcCommand} ${ghcCommand}i ${ghcCommand}-${ghc.version} ${ghcCommand}i-${ghc.version}; do
-      if [[ -x "${ghc}/bin/$prg" ]]; then
-        rm -f $out/bin/$prg
-        makeWrapper ${ghc}/bin/$prg $out/bin/$prg                           \
+      if [[ -x "$unwrappedGhc/bin/$prg" ]]; then
+        rm -f $wrappedGhc/bin/$prg
+        makeWrapper $unwrappedGhc/bin/$prg $wrappedGhc/bin/$prg                           \
           --add-flags '"-B$NIX_${ghcCommandCaps}_LIBDIR"'                   \
-          --set "NIX_${ghcCommandCaps}"        "$out/bin/${ghcCommand}"     \
-          --set "NIX_${ghcCommandCaps}PKG"     "$out/bin/${ghcCommand}-pkg" \
+          --set "NIX_${ghcCommandCaps}"        "$wrappedGhc/bin/${ghcCommand}"     \
+          --set "NIX_${ghcCommandCaps}PKG"     "$wrappedGhc/bin/${ghcCommand}-pkg" \
           --set "NIX_${ghcCommandCaps}_DOCDIR" "${docDir}"                  \
           --set "GHC_PLUGINS"                  "$GHC_PLUGINS"               \
           --set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
       fi
     done
 
     for prg in "${targetPrefix}runghc" "${targetPrefix}runhaskell"; do
-      if [[ -x "${ghc}/bin/$prg" ]]; then
-        rm -f $out/bin/$prg
-        makeWrapper ${ghc}/bin/$prg $out/bin/$prg                           \
-          --add-flags "-f $out/bin/${ghcCommand}"                           \
-          --set "NIX_${ghcCommandCaps}"        "$out/bin/${ghcCommand}"     \
-          --set "NIX_${ghcCommandCaps}PKG"     "$out/bin/${ghcCommand}-pkg" \
+      if [[ -x "$unwrappedGhc/bin/$prg" ]]; then
+        rm -f $wrappedGhc/bin/$prg
+        makeWrapper $unwrappedGhc/bin/$prg $wrappedGhc/bin/$prg                           \
+          --add-flags "-f $wrappedGhc/bin/${ghcCommand}"                           \
+          --set "NIX_${ghcCommandCaps}"        "$wrappedGhc/bin/${ghcCommand}"     \
+          --set "NIX_${ghcCommandCaps}PKG"     "$wrappedGhc/bin/${ghcCommand}-pkg" \
           --set "NIX_${ghcCommandCaps}_DOCDIR" "${docDir}"                  \
           --set "GHC_PLUGINS"                  "$GHC_PLUGINS"               \
           --set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
@@ -132,8 +124,8 @@ in runCommand "${componentName}-${ghc.name}-env" {
   # Wrap haddock, if the base GHC provides it.
   + ''
     if [[ -x "${haddock}/bin/haddock" ]]; then
-      rm -f $out/bin/haddock
-      makeWrapper ${haddock}/bin/haddock $out/bin/haddock    \
+      rm -f $wrappedGhc/bin/haddock
+      makeWrapper ${haddock}/bin/haddock $wrappedGhc/bin/haddock    \
         --add-flags '"-B$NIX_${ghcCommandCaps}_LIBDIR"'  \
         --set "NIX_${ghcCommandCaps}_LIBDIR" "${libDir}"
     fi
@@ -143,12 +135,31 @@ in runCommand "${componentName}-${ghc.name}-env" {
   # --global-package-db flag.
   + ''
     for prg in ${ghcCommand}-pkg ${ghcCommand}-pkg-${ghc.version}; do
-      if [[ -x "${ghc}/bin/$prg" ]]; then
-        rm -f $out/bin/$prg
-        makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "--global-package-db=$out/${packageCfgDir}"
+      if [[ -x "$unwrappedGhc/bin/$prg" ]]; then
+        rm -f $wrappedGhc/bin/$prg
+        makeWrapper $unwrappedGhc/bin/$prg $wrappedGhc/bin/$prg --add-flags "--global-package-db=$wrappedGhc/${packageCfgDir}"
       fi
     done
 
     ${postInstall}
-  ''
-)
+  '';
+
+  drv = runCommand "${componentName}-${ghc.name}-env" {
+  preferLocalBuild = true;
+  passthru = {
+    inherit script targetPrefix;
+    inherit (ghc) version meta;
+  };
+  propagatedBuildInputs = configFiles.libDeps;
+  nativeBuildInputs = [ghc];
+} (''
+    mkdir -p $out/configFiles
+    configFiles=$out/configFiles
+    ${configFiles.script}
+    wrappedGhc=$out
+    ${script}
+'');
+in {
+  inherit script drv targetPrefix;
+  baseGhc = ghc;
+}

builder/haddock-builder.nix

@@ -47,7 +47,7 @@ let
   finalConfigureFlags = lib.concatStringsSep " " (
     [ "--prefix=${componentDrv}"
       "${haskellLib.componentTarget componentId}"
-      "$(cat ${docsConfigFiles}/configure-flags)"
+      "$(cat $configFiles/configure-flags)"
     ]
     ++ commonConfigureFlags
     ++ lib.optional doHaddock' " --docdir=${docdir "$doc"}");
@@ -63,28 +63,33 @@ let
     name = fullName;
 
     passthru = {
-      configFiles = docsConfigFiles;
-
       # The directory containing the haddock documentation.
-      haddockDir = if doHaddock' then "${docdir drv.doc}/html" else null;
+      haddockDir = lib.const (if doHaddock' then "${docdir drv.doc}/html" else null);
     };
 
     # `out` contains the `package.conf.d` files used for building the
     # haddock files.
     # `doc` contains just the haddock output files.
-    outputs = ["out"]
+    outputs = ["out" "configFiles" "ghc"]
     ++ lib.optional doHaddock' "doc";
 
-    propagatedBuildInputs = builtins.concatLists pkgconfig;
+    propagatedBuildInputs =
+         builtins.concatLists pkgconfig
+      ++ configFiles.libDeps;
 
-    buildInputs = component.libs
-      ++ map (d: d.components.library.haddock or d) component.depends;
+    buildInputs = component.libs;
 
     nativeBuildInputs =
-      [ shellWrappers buildPackages.removeReferencesTo ]
+      [ ghc buildPackages.removeReferencesTo ]
       ++ componentDrv.executableToolDepends;
 
     configurePhase = ''
+      mkdir -p $configFiles
+      mkdir -p $ghc
+      wrappedGhc=$ghc
+      ${docsConfigFiles.script}
+      ${shellWrappers.script}
+      PATH=$wrappedGhc/bin:$PATH
       runHook preConfigure
       echo Configure flags:
       printf "%q " ${finalConfigureFlags}
@@ -145,7 +150,7 @@ let
           # working hyper links.
           pkg=$(basename "$i")
           sed -e "s|haddock-interfaces:.*|haddock-interfaces: $docdir/html/${componentId.cname}.haddock|" -e "s|haddock-html:.*|haddock-html: $docdir/html/|" "$i" > "$pkg"
-          ${ghc.targetPrefix}ghc-pkg -v0 --package-db ${docsConfigFiles}/${configFiles.packageCfgDir} -f $out/package.conf.d register "$pkg"
+          ${ghc.targetPrefix}ghc-pkg -v0 --package-db $configFiles/${configFiles.packageCfgDir} -f $out/package.conf.d register "$pkg"
         done
 
         ln -s ${componentDrv}/exactDep $out/exactDep