[Haskell-cafe] gui libs? no thanks, i'm just browsing.. ;-)

[Claus Reinke]

>That is all true.  ABI compatibility would be nice. But I don't see how 
>to combine with GHC's other goals.  Notably, we frequently add new 
>information to interface files, and it would be a major constraint not to 
>be able to do so.

that is the bit i never quite understood: if newer formats just add 
information, that should be no problem. the problem, presumably,
comes when newer ghcs can no longer manage without that extra
information. 

so, if ghc was truly upgraded (add things, improve things) instead 
of modified (add some, take away some), then it should be able to 
work with "old" compiled libs at least as well as its previous version 
would have. just that it could do even better if it was allowed to 
recompile the old lib itself..

what am i missing?
claus