On Thu, 2009-02-05 at 00:03 +0100, David Waern wrote:

2009/2/4 Ross Paterson :

...

On Wed, Feb 04, 2009 at 10:52:32PM +0000, Dave Tapley wrote:

...

dave@eliza:~$ cabal install haddock Resolving dependencies... cabal: cannot configure haddock-2.4.1. It requires ghc >=6.8.2 && <6.13 There is no available version of ghc that satisfies >=6.8.2 && <6.13 dave@eliza:~$ ghc --version The Glorious Glasgow Haskell Compilation System, version 6.8.2

There is also a library package called ghc.

Which should be installed if you have the compiler. Hmm.

If the package is broken due to missing dependencies then cabal-install ignores it. It's on my TODO list to make it report more clearly the fact that it needed a package that is broken (ie instead of removing the broken packages from the set of installed packages, add a constraint not to use that version and when we get a constraint conflict with we can report a more helpful message). Dave, you can confirm if the ghc package is broken by running ghc-pkg check. Duncan

On Tue, 2009-02-17 at 16:03 +0000, Dave Tapley wrote:

Hey Duncan,

Thanks for the fast reply / sorry about my slow one! The next instalment:

dave@eliza:~$ ghc-pkg check package ghc-6.8.2 has missing dependencies: Cabal-1.2.3.0

Which is interesting, no?

Indeed. It looks like you accidentally unregistered Cabal-1.2.3.0, which breaks dependent packages (ghc-6.8.2). Unfortunately you cannot fix this by re-installing Cabal-1.2.3.0. You cannot guarantee that you'll get the exact same ABI. You either need to re-register the original version (the actual files are almost certainly still installed) or re-install ghc. If you're on debian or gentoo then you're in luck as they both provide a backup of the original package.conf as package.conf.shipped. This will let you re-register the original by: $ ghc-pkg describe Cabal-1.2.3.0 -f package.conf.shipped > pkg $ ghc-pkg register pkg In ghc-6.10 it's be a bit harder to break packages by unregistering their dependencies. ghc-pkg unregister now complains and makes you use --force if you really do want to break dependencies. Duncan

Dave,

2009/2/4 Duncan Coutts :

...

On Thu, 2009-02-05 at 00:03 +0100, David Waern wrote:

...

2009/2/4 Ross Paterson :

...

On Wed, Feb 04, 2009 at 10:52:32PM +0000, Dave Tapley wrote:

...

dave@eliza:~$ cabal install haddock Resolving dependencies... cabal: cannot configure haddock-2.4.1. It requires ghc >=6.8.2 && <6.13 There is no available version of ghc that satisfies >=6.8.2 && <6.13 dave@eliza:~$ ghc --version The Glorious Glasgow Haskell Compilation System, version 6.8.2

There is also a library package called ghc.

Which should be installed if you have the compiler. Hmm.

If the package is broken due to missing dependencies then cabal-install ignores it. It's on my TODO list to make it report more clearly the fact that it needed a package that is broken (ie instead of removing the broken packages from the set of installed packages, add a constraint not to use that version and when we get a constraint conflict with we can report a more helpful message).

Dave, you can confirm if the ghc package is broken by running ghc-pkg check.

Duncan

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