2002-11-15  Klee Dienes  <kdienes@apple.com>

         * buildsym.h (pop_context): Check for stack underflow.
         * dbxread.c (process_one_symbol): Complain and stop processing
         that symbol if we are already at the top of the context stack 
for
         a function-end N_FUN (this would imply an umatched RBRAC).  
Ditto
         when processing N_RBRAC.