Cabal install broken with GHC 6.10.1.* HEAD

Duncan Coutts duncan.coutts at
Mon Mar 2 07:37:36 EST 2009

On Mon, 2009-03-02 at 11:13 +0000, Neil Mitchell wrote:
> Hi Duncan,
> I'm afraid I had to roll back the GHC version - its my work computer
> and not being able to work on it turned out to be an issue...
> >> This causes cabal install to break, as it implicitly adds
> >> base == which nothing has so nothing installs.
> >
> > There's something else going on. cabal-install does know about the base
> > package but does not have any hard coded versions. The only constraint
> > it places on base is that the dependency solver must pick an installed
> > version of base (ie and not try to install from sources off hackage).
> Hmm, weird. It was giving constraints such as base-any && ==,
> which I assumed had come from hardcoding inside cabal. Given that
> isn't the issue, my problem was probably elsewhere.
> >> Could a new version of cabal install be released that fixes this?
> >
> > We'll need more details to work out what the problem is. Could you
> > describe the symptoms in more detail. See also if ghc-pkg check reports
> > anything.
> The computer I was working on had many different versions of GHC on,
> each with different libraries. It's entirely possible something got
> confusing and used the wrong ghc-pkg/ghc combination

Cabal checks that the version of ghc and ghc-pkg match up exactly.

> or some other mess happened. I'd regard this as a hisen-bug, and if I
> get a chance next week I'll do the same things again and see if the
> same things happen.

Ok. I'm sure you'll let me know if you find anything.


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