haskell/cabal — pull request #1277 by 23Skidoo (2013-04-20 00:52:16+00:00)
Title: Add a '-j' flag to the 'build' command.

For now, this only affects add-source dependencies. In the future, it will be used to enable module-level parallelism.

Fixes #1272.

Since we're also calling `maybeInstallAddSourceDeps` in `testAction` and `benchAction`, it probably makes sense to add a `--jobs` argument for them also.