GNU gprof: Incompatibilities

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# 8. Incompatibilities with Unix `gprof`

GNU `gprof` and Berkeley Unix `gprof` use the same data file ``gmon.out'`, and provide essentially the same information. But there are a few differences.

- GNU `gprof` uses a new, generalized file format with support for basic-block execution counts and non-realtime histograms. A magic cookie and version number allows `gprof` to easily identify new style files. Old BSD-style files can still be read. See section Profiling Data File Format.

- For a recursive function, Unix `gprof` lists the function as a parent and as a 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.

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