cabal: enable multi-threaded builds with GHC 7.8.x or later

#3220
NixOS · Aug 16, 2014 · 817c0e4 · 817c0e4
1 parent 462e067
commit 817c0e4
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/pkgs/build-support/cabal/default.nix b/pkgs/build-support/cabal/default.nix
@@ -210,6 +210,9 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
               ${optionalString (self.enableSharedExecutables && self.stdenv.isDarwin) ''
                 configureFlags+=" --ghc-option=-optl=-Wl,-headerpad_max_install_names"
               ''}
+              ${optionalString (versionOlder "7.8" ghc.version) ''
+                configureFlags+=" --ghc-option=-j$NIX_BUILD_CORES"
+              ''}
 
               echo "configure flags: $extraConfigureFlags $configureFlags"
               ./Setup configure --verbose --prefix="$out" --libdir='$prefix/lib/$compiler' \