OK, somebody sent a hint that it might make sense to take the -O3 out of the make flags. Done.
Result: I can now get through this command: hget -v http://plan9.bell-labs.com/plan9/download/plan9.iso.bz2>/tmp/iso.bz2 |[2]aux/statusbar plan9.iso without an explosion. We'll see. I'm always ready to suspect gcc since it has been a cause of so much trouble in the past :-) ron