[Haskell-cafe] Re: How does cabal determine version ranges in the dependencies?

[Duncan Coutts]

On Mon, 2009-11-23 at 19:38 +0100, dave wrote:
> On Mon, 2009-11-23 at 09:50 -0200, Maurí­cio CA wrote:
> > > I recently started porting cabal-install to Freebsd. When
> >  > I looked at its dependencies on hackage, I noticed HTTP
> >  > (>=4000.0.2 && <4001). However the latest HTTP version on
> >  > hackage is 4000.0.8. That struck me as kinda odd. How can cabal
> >  > tell that it won't be compatible with HTTP version 4001?
> > 
> > If it doesn't break dependencies, it won't be called http 4001,
> > it will be called 4000.0.9 :)
> > 
> > Check:
> > 
> > http://www.haskell.org/haskellwiki/Package_versioning_policy
> 
> I see. Thanks for the link. I wasn't aware of the versioning policy.
> Just to clarify though, wouldn't the next higher major version by 4000.1
> rather than 4001?

The HTTP package has not been following the PVP, but something rather
similar (which is not written down anywhere). It should really move to
following the PVP.

Duncan