I made a test build of a monolithic subpackaged build of Haskell Platform 2012.2.0.0.
:
You can test it with the ghc-7.4.1 in F18 rawhide.
A more final build is: http://koji.fedoraproject.org/koji/taskinfo?taskID=4139615 (git scratch build) which actually installs correctly.
I am considering moving to this monolithic package for F18, since it speeds up building HP considerably (there is very little churn of individual HP libraries and packages anyway) and it also makes it a lot easier to test and experiment with Haskell Platform.
Now committed to package git. So if you think this is a bad idea please speak up real soon. :-)
Jens