RE: problems building ghc 6.4.1_pre using 6.4 with multiple cabalversions installed

Quite right this is a problem, and it looks like something we should fix
before 6.4.1.  I'll give it some thought.

Cheers,
        Simon

On 24 August 2005 14:42, Duncan Coutts wrote:

> With our current 6.4.1 snapshot 20050819, we have problems building
> when we've got more than over version of cabal registered.
> 
> That is we build it using ghc 6.4 and we have cabal-1.0 and
> cabal-1.1.2 installed. Then it complains that multiple packages match
> "-package cabal".
> 
> It also has problems when no version of cabal is registered.
> 
> There is no problem building with ghc 6.2.2 with no cabal installed.
> 
> I think it would be much more reliable if ghc did not rely on the
> version of cabal installed and registered with ghc 6.4. Since it has
> to work without cabal anyway (for the 6.2.2 case), wouldn't it be
> possible to make it ignore any installed version of cabal even when
> building with ghc 6.4?
> 
> At the moment, it looks like we're going to have problems on gentoo
> upgrading users from ghc 6.4 to 6.4.1. Our current idea is to
> unregister the Cabal-1.0 package that ghc 6.4 comes with and use a
> later version (Cabal-1.1.2 at the moment) however it's not clear that
> ghc will cope with using the later version. We need to install the
> later version anyway for other reasons (version 1.0 has bugs and
> lacks some features we need for reasonable packaging) and ghc 6.4
> does not cope very well with having multiple versions of a package
> installed (this is improved in 6.4.1), hence the rationale for
> unregistering the 1.0 version entirely.