Problems with packages on a netbsd-6 sparc

[Chris Ross <cross+netbsd%distal.com@localhost>]

  So, I have an old sparc20 I was getting running, and I built a April 29 
netbsd-6 for it, and it seemed to boot and run just fine.  I had a few watchdog 
reset problems, but running without mixing processor speeds seems to have fixed 
that.

  Right now I'm running it with a pair of 125Mhz Hypersparcs.  And, it's 
working fine.  But, I noticed that one of the early packages I built, sudo, 
received a bus error as soon as it was run.

  Going back to pkgsrc, and building again, I saw it behave the same way.  So I 
built it again after modifying the makefile replacing "-O2" with "-g", and it 
suddenly works.  At least, as root, I was able to "sudo date" and see:

# ./sudo date
sudo: unknown login class: daemon
Tue May  1 12:30:59 EDT 2012
# 

  So, I built it again, with -O2 and saw what I'd seen before:

# ./sudo date
Bus error 
# 

  Does anyone have any idea what the issue is here?  Compiler bug?  Thanks...  
I'll do some more testing with different optimization levels, but the problem 
clearly exists...

        - Chris