In retrospect I should have used a different name. Feel free to fix it (and the wiki page).
I've created a ticket with a patch that I think addresses this issue [1]. The patch adds a mechanism that allows packages and programs to be disabled when building with a specific stage of GHC. It also adds a default set of disabled packages when Stage1Only is set. A side effect of this change is that no package adds an RTS dependency when Stage1Only is enabled, so I've also added all_rts to the all target in rts/ghc.mk. I wasn't able to figure out where the dependency on the all_rts target comes from, so if that change doesn't make sense I'm happy to modify the attached patch :) --trevor [1] http://hackage.haskell.org/trac/ghc/ticket/7841