Michael wrote...
>Any suggestions from the gcc users out there on how to tackle this problem?

CSEQ has already been mentioned. But as I am not one of the happy owners,
I usually resort to my Pascal/iX compiler's $LISTINTR$ option to generate
an extensive listing of the SYSINTR contents in human readable form. It
helps to understand the parameter list (parm size, alignment, hidden ones)
but the manual work of coding the proper call is still somewhat tedious.
So I typically use c89 for prototyping and only add #ifdef __GNUC__ parts
when I'm pretty sure my code is reasonably final.

Lars.

(ok ok, it's somewhat unfair as I have all the HP compilers at hand ;-)