Was there an ABI change for gcc for ia64 between 
"old":	    gcc version 2.9-ia64-000216-final
"new":	    gcc version 2.96-ia64-000717 snap 001117

We are seeing interoperation failures between code compiled with these
two versions, related to structure passing (thankfully, user-space only
for now).

I've got a test case which shows this:

caller (tv1.c)	    callee (blah.c)	result
old		    old	   		OK
old		    new			BAD
new		    old			BAD
new		    new			OK