Setup doesn't know Cabal's version

[Axel Simon]

Good morning,

I'm currently migrating Gtk2hs to use Cabal to build. There is one  
issue that makes it really difficult to build Setup.hs files that work  
with several Cabal versions, namely that the version of Cabal itself  
is not passed to Setup.hs via CPP #defines. Thus, even though I can  
portably pre-process my Setup.hs scripts, I cannot reliably write code  
that works with Cabal 1.6 and 1.8. Am I missing something?

Furthermore, I cannot build an executable that depends on the library  
being built in the same Cabal file. Is that intentional?

Cheers,
Axel.