remove old packages after successful update

[bos]

(Imported from Trac #442, reported by guest on 2009-01-05)

After a successful cabal update command, the old version of the package could be removed. (It required to rebuild/reinstall all the dependent packages as well. It is reported in #441 ticket.)

I do not think it should be a default behavior, but make it possible would be really nice. :)

[bos]

(Imported comment by @dcoutts on 2009-01-05)

Currently we never uninstall packages. See #234.

Perhaps the best user interface would be some sort of clean / collect command to uninstall old versions of packages that are no longer needed (like nix). This would involve tracking the packages that the user deliberately installed, see #199. It's a bit tricky since we do not know all libs that are wanted by the user, in particular it's difficult to figure out if the user wants multiple versions of a package installed (unless multiple versions are required by other things they do want installed).

[tibbe]

Closing as there's been no activity in years.

We're cleaning up the bug tracker to make it useful again and are thus closing bugs that haven't seen any activity in a long time. Please re-open (or file a new bug) if the problem reappears.