C program getting too big...

I've got a problem with my C compiler... I'm running an Altos 586 with
Xenix 3.0, using the standard "cc" command. My problem is, when a certain
program I have gets too big, when I run it, sometime during the run I
get the following message:
 memory fault - core dumped
  
  I've seen that message many times before, and it has always been the
result of a coding error, but this time the only thing that seems to
be causing it is that the program is too big. HELP!