Main Program
============
Most languages allow the main program to have any name. The
`N_MAIN' stab type tells the debugger the name that is used in this
program. Only the string field is significant; it is the name of a
function which is the main program. Most C compilers do not use this
stab (they expect the debugger to assume that the name is `main'), but
some C compilers emit an `N_MAIN' stab for the `main' function. I'm
not sure how XCOFF handles this.