ghc-pkg stack overflow when mutually dependent packages installed

[greenrd]

I erroneously added mutual dependencies between two packages I was working on. When I installed them both, both Cabal and ghc-pkg started behaving strangely:

- Setup.hs configure would run, but very slowly
- Setup.hs build would stack overflow
- ghc-pkg list would stack overflow

I realised that there was a mutual dependency, and manually edited package.conf to unregister one of them. This fixed the problem.

[igloo]

Thanks for the report! We should take a look at what is going on.

[simonmar]

See also #1882. It looks like GHC itself croaks when there are cyclic dependencies in the package database too.

[simonmar]

Fixed, to merge:

Wed Jan 23 16:06:35 GMT 2008  Simon Marlow <simonmar@microsoft.com>
  * FIX #1750: throw out mutually recursive groups of packages

Wed Jan 23 16:07:03 GMT 2008  Simon Marlow <simonmar@microsoft.com>
  * FIX #1750: in isBrokenPackage, don't loop if the deps are recursive

Wed Jan 23 16:31:45 GMT 2008  Simon Marlow <simonmar@microsoft.com>
  * Show CmdLineError exceptions as "<command line>: ..."

[igloo]

All 3 merged.