MacOSX support

[Andreas Tobler]

Boehm, Hans wrote:
> I haven't yet imported the MacOSX fix into my tree, though I plan to do so soon.
> 
> I'm hoping to have a bit of time to look at this again starting on Tuesday.
> 
> If the gcc3.3 release is still on schedule, I agree that doing a full import would be risky.  We should definitely do it for the trunk, though perhaps after the official 6.2 GC release.
> 
> Should I try to extract and check in the dl_iterate_phdr() fix separately?  That's still somewhat risky, since the fix affects several files.  But it fixes a serious bug in the 3.3 libgcj, which I would really like to see fixed.  (Or is there a plan to change dl_iterate_phdr to avoid the lock?)  If we go this route, it would be nice if someone could check the MacOSX fix in separately as well.
> 

If you can feed me with the dl_iterate_phdr() fix for the gcc-3.3-boehm 
version I could test and later if it works and everyone agrees I could 
take this to apply.

Andreas