child, with a 'calls' field that lists the number
     of recursive calls.  GNU 'gprof' omits these lines and puts the
     number of recursive calls in the primary line.

   * When a function is suppressed from the call graph with '-e', GNU
     'gprof' still lists it as a subroutine of functions that call it.

   * GNU 'gprof' accepts the '-k' with its argument in the form
     'from/to', instead of 'from to'.

   * In the annotated source listing, if there are multiple basic blocks
     on the same line, GNU 'gprof' prints all of their counts, separated
     by commas.

   * The blurbs, field widths, and output formats are different.  GNU
     'gprof' prints blurbs after the tables, so that you can see the
     tables without skipping the blurbs.