On Tue, Nov 8, 2011 at 4:30 PM, Giovanni Tirloni wrote:

...

3) How to install it into a separate location so it would not ruin my current platform?

 You can install it under a different username.

You can also use a sandboxed build tool like cabal-dev or virthualenv -- both of which are on hackage. (While the HP provides a great way to install Haskell, and it defines a set of mature packages, it is not necessary for development -- cabal install doesn't pay any special attention to HP packages, for example.). Having the HP installed is convenient, particularly if you run ghci a lot, but all you need is ghc, cabal-install, and a connection to hackage. --Rogan

On Wed, Nov 9, 2011 at 8:26 AM, dokondr wrote:

On Wed, Nov 9, 2011 at 3:48 AM, Rogan Creswick wrote:

...

On Tue, Nov 8, 2011 at 4:30 PM, Giovanni Tirloni wrote:

...

...

3) How to install it into a separate location so it would not ruin my current platform?

You can install it under a different username.

Haskell Platform (HP) is installed for *all* users in one location at OSX: /Library/Frameworks/GHC.framework/Versions/ total 8 drwxrwxr-x 4 root admin 136 21 feb 2011 . drwxrwxr-x 5 root admin 170 21 feb 2011 .. drwxrwxr-x 4 root admin 136 11 jun 2010 612 lrwxr-xr-x 1 user staff 3 21 фев 2011 Current -> 612

1) How different username will help here?

I meant install new packages through cabal under a different username. The cabal repo should be localized unless you specify --global Please see Rogan's suggestions.

2) Is there any way to see what packages HP includes without actually installing it? Some online document listing HP packages?

http://hackage.haskell.org/platform/contents.html http://lambda.haskell.org/hp-tmp/docs/2011.2.0.0/start.html -- Giovanni

On 11-11-09 06:37 AM, dokondr wrote:

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?

Every GHC version ignores libs built by other GHC versions. In short see ~/.ghc In long see my http://www.vex.net/~trebla/haskell/sicp.xhtml ~/.cabal is hardly the whole story or the major story. More people need to learn that.