> There was some email on port-powerpc or port-macppc (check the 
> archives) that clearly pointed to an ABI issue -- confusion about 
> pass-by-value and pass-by-reference.  Someone even had a test program 
> for it.
> 
>          -- Jason R. Thorpe <thorpej@wasabisystems.com>

Bummer.  I was a bit quick.  Was this the bit about whether a struct
(at least the first 8 words) is passed in registers?  I believe there
was an issue that SYSV passed the first 8 words in registers, while
AIX passed the whole struct in memory by reference.

BTW, I forgot to say, thanks for pitching in, Matt.

-Mike