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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.