darwin_8 variants on Darwin 9 / Mac OS X 10.5 Leopard

[Ryan Schmidt]

So, we have people who had MacPorts installed in Tiger, on which  
MacPorts selected the darwin_8 variant. And then they upgraded to  
Leopard and retained their MacPorts installation. Now they've got  
Leopard, but their installed ports still say darwin_8. Further, when  
they go to upgrade these ports at some later point, MacPorts still  
tries to use the darwin_8 variant. Surely this is bad.

What are users expected to do when upgrading the OS major version?  
Are they expected to throw out their MacPorts install and start over?  
That would be inconvenient. I'm recommending people uninstall all  
ports that have darwin_8 variants and reinstall them. That's  
inconvenient too.

What can we do to improve this situation?