On Wed, Nov 9, 2011 at 3:37 AM, dokondr
In case I upgrade to the latest Haskell Platform, what will happen to packages already installed in my ~/.cabal folder? Some of these are quite old and most probably will be incompatible with GHC 7 Does upgrade process remove old and create anew ~/.cabal folder?
The compiled packages are stored in a directory that is specific to the version of GHC that was used to build them, so you don't need to worry about that. Indeed, you can switch between GHCs (eg: by tweaking your $PATH, or using a tool like virthualenv) as much as you want and they won't interfere with most packages. (There may be issues with respect to /executables/ but that /should/ also be OK. Executables and cabal are a whole different problem, but most of the time things work out.) --Rogan