This was already discussed on moobunny.
AROS and MorphOS do not rely on horrible and giant compiler patches breaking the SystemV ABI and such.
Our diffs are much smaller (or even non-existant...) and can be applied in no time.
On this matter, no need to coordinate anything except if you want to lose your time or look cool to some range of people...

Edit:
And to be sure Michael Merkel understands why such coordination is not really required... there is no patch to apply to get a working MorphOS compiler. Just grab GCC source, configure&make and you get a working MorphOS compiler :-)
This is not the case for os4, AFAIK. So they have a reason to have several people maintaining their heavy patches... But do not generalise.

[ Edited by Henes on 2006/4/6 18:57 ]