ANNOUNCE: GHC 6.10.2 Release Candidate 1

[Don Stewart]

We must have the gtk2hs team invovled in this discussion. They were
using an undocumented feature. It may be trivial to fix.

--Don

jnf:
> 
> Hello Simon,
> I've put a request about the issue on the gtk2hs users mailing list:
> 
> > I've tried a gtk2hs app on ghc 6.10.2 release candidate.
> > It crashes frequently and Simon (as you can read down here) assumes it
> > is gtk2hs problem.
> > My question is:
> >        Is this problem known to gtk2hs developers?
> >        Is it really a gtk2hs problem?
> >        How difficult is it to fix the problem?
> >        When will we have a patch to use gtk2hs with 6.10.2, 
> >                is it already in the repo?      
> 
> However, I'm a little surprised that a little version upgrade from 6.10.1 to
> 6.10.2 may break all gui apps based on gtk2hs. May it be that many more apps
> are affected because of this change? What's about wxhaskell e.g.? Well,
> maybe we have only few Haskell applications around, but usually I
> wouldn't expect such a dramatic effect from such a moderate upgrade. Is this
> fix so important to introduce it now? What does it help when it was never
> officially supported if it causes such troubles?
> 
> Jürgen  
>  
> 
> 
> Simon Marlow-7 wrote:
> > 
> > jutaro wrote:
> >> I've installed a GUI application based on gtk2hs.
> >>         
> >> It frequently crashes with the error: 
> >> leksah: error: a C finalizer called back into Haskell.
> >> use Foreign.Concurrent.newForeignPtr for Haskell finalizers.
> >> 
> >> This error did never occur with the 6.10 released version. It was
> >> verified
> >> that this happens on different machines. I've no idea how to isolate this
> >> bug.
> > 
> > This will need to be fixed in gtk2hs.  Previously GHC allowed finalizers
> > to 
> > call back into Haskell, but this was never officially supported.  Now it
> > is 
> > officially unsupported, because finalizers created via
> > Foreign.mkForeignPtr 
> > are run directly by the garbage collector.
> > 
> > See
> > 
> >   http://hackage.haskell.org/trac/ghc/ticket/1364
> > 
> > Cheers,
> > 	Simon
> > _______________________________________________
> > Glasgow-haskell-users mailing list
> > Glasgow-haskell-users at haskell.org
> > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
> > 
> > 
> 
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