Stop haskell from generating $out/lib.

Nix cc logic relies on passing /lib for each dependency as a library
search path.  This makes little sense for haskell packages, as their
libs are nested deeply in the /lib tree.  Also GHC will generate the
right library serach paths on its own from the package database
entries.

The larger issue though is that with one search path entry for each
library, and a similar one generated by GHC for each dependency
will eventually overflow the command line argument limits.

As such we do *not* put haskell libraries into $out anymore.

pkgs/development/haskell-modules/generic-builder.nix

@@ -131,12 +131,12 @@ let
   buildFlagsString = optionalString (buildFlags != []) (" " + concatStringsSep " " buildFlags);
 
   defaultConfigureFlags = [
-    "--verbose" "--prefix=$out" "--libdir=\\$prefix/lib/\\$compiler" "--libsubdir=\\$pkgid"
+    "--verbose" "--prefix=$out" "--libdir=\\$prefix/\\$compiler" "--libsubdir=\\$pkgid"
     (optionalString enableSeparateDataOutput "--datadir=$data/share/${ghc.name}")
     (optionalString enableSeparateDocOutput "--docdir=${docdir "$doc"}")
     "--with-gcc=$CC" # Clang won't work without that extra information.
     "--package-db=$packageConfDir"
-    (optionalString (enableSharedExecutables && stdenv.isLinux) "--ghc-option=-optl=-Wl,-rpath=$out/lib/${ghc.name}/${pname}-${version}")
+    (optionalString (enableSharedExecutables && stdenv.isLinux) "--ghc-option=-optl=-Wl,-rpath=$out/${ghc.name}/${pname}-${version}")
     (optionalString (enableSharedExecutables && stdenv.isDarwin) "--ghc-option=-optl=-Wl,-headerpad_max_install_names")
     (optionalString enableParallelBuilding "--ghc-option=-j$NIX_BUILD_CORES")
     (optionalString useCpphs "--with-cpphs=${cpphs}/bin/cpphs --ghc-options=-cpp --ghc-options=-pgmP${cpphs}/bin/cpphs --ghc-options=-optP--cpp")
@@ -251,7 +251,7 @@ stdenv.mkDerivation ({
 
   setupCompilerEnvironmentPhase =
   (optionalString doVerbose ''
-    set -x
+    # set -x
   '') + ''
     runHook preSetupCompilerEnvironment
 
@@ -271,9 +271,9 @@ stdenv.mkDerivation ({
     for p in "''${pkgsHostHost[@]}" "''${pkgsHostTarget[@]}"; do
       ${optionalString doVerbose ''
         echo $p
-        echo $p/lib/${ghc.name}/package.conf.d
-    ''}if [ -d "$p/lib/${ghc.name}/package.conf.d" ]; then
-        cp -f "$p/lib/${ghc.name}/package.conf.d/"*.conf $packageConfDir/
+        echo $p/${ghc.name}/package.conf.d
+    ''}if [ -d "$p/${ghc.name}/package.conf.d" ]; then
+        cp -f "$p/${ghc.name}/package.conf.d/"*.conf $packageConfDir/
         continue
       fi
       if [ -d "$p/include" ]; then
@@ -348,7 +348,7 @@ stdenv.mkDerivation ({
 
   buildPhase = ''
     runHook preBuild
-    ${setupCommand} build ${buildTarget}${crossCabalFlagsString}${buildFlagsString}${optionalString doVerbose " -v3"}
+    ${setupCommand} build ${buildTarget}${crossCabalFlagsString}${buildFlagsString}${optionalString doVerbose ""}
     runHook postBuild
   '';
 
@@ -373,7 +373,7 @@ stdenv.mkDerivation ({
 
     ${if !hasActiveLibrary then "${setupCommand} install" else ''
       ${setupCommand} copy
-      local packageConfDir="$out/lib/${ghc.name}/package.conf.d"
+      local packageConfDir="$out/${ghc.name}/package.conf.d"
       local packageConfFile="$packageConfDir/${pname}-${version}.conf"
       mkdir -p "$packageConfDir"
       ${setupCommand} register --gen-pkg-config=$packageConfFile
@@ -398,7 +398,7 @@ stdenv.mkDerivation ({
     ${optionalString doCoverage "mkdir -p $out/share && cp -r dist/hpc $out/share"}
     ${optionalString (enableSharedExecutables && isExecutable && !isGhcjs && stdenv.isDarwin && stdenv.lib.versionOlder ghc.version "7.10") ''
       for exe in "$out/bin/"* ; do
-        install_name_tool -add_rpath "$out/lib/ghc-${ghc.version}/${pname}-${version}" "$exe"
+        install_name_tool -add_rpath "$out/ghc-${ghc.version}/${pname}-${version}" "$exe"
       done
     ''}
 
@@ -479,4 +479,5 @@ stdenv.mkDerivation ({
 // optionalAttrs (dontStrip)            { inherit dontStrip; }
 // optionalAttrs (hardeningDisable != []) { inherit hardeningDisable; }
 // optionalAttrs (buildPlatform.libc == "glibc"){ LOCALE_ARCHIVE = "${glibcLocales}/lib/locale/locale-archive"; }
+ // optionalAttrs doVerbose { NIX_DEBUG = 1; }
 )