[Haskell-cafe] How to keep cabal and ghci package versions in sync?

[Christopher Done]

On 24 April 2011 22:27, Rogan Creswick <creswick at gmail.com> wrote:

> On Sun, Apr 24, 2011 at 11:13 AM, Gracjan Polak <gracjanpolak at gmail.com>
> wrote:
> > I have a project with a .cabal file listing package dependencies using
> > the usual version constraints ==X.Y.* <Z.W or >=K.J syntax.
> > Standard route cabal configure; cabal build works correctly as it is able
> > to select working set of package versions.
> >
> > I have also a .ghci file. When I run GHCi it uses all latest installed
> packages
> > in the system. This prevents the project from loading.
> >
> > I tried to use 'cabal-dev ghci', but this still selects latest global
> packages.
>
> This should only arise for the base ghc packages, which are tied
> closely enough to ghc that you should probably switch ghc versions if
> you want to work with different versions of those core packages.
>
> If you're installing additional packages globally, my only advice is:
> Beware, there be dragons!  I strongly recommend that you ghc-pkg
> unregister all the non-essential packages from your global package db
> because:
>

I'll second this; I had the same problem and just uninstalled the global
package and went ahead and uninstalled them all, no problems since. All my
projects are under cabal-dev so it's not a problem.
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