If gprof was compiled with debugging enabled,
the `-d' option triggers debugging output
(to stdout) which can be helpful in understanding its operation.
The debugging number specified is interpreted as a sum of the following
options:
2 - Topological sort
Monitor depth-first numbering of symbols during call graph analysis
4 - Cycles
Shows symbols as they are identified as cycle heads
16 - Tallying
As the call graph arcs are read, show each arc and how
the total calls to each function are tallied
32 - Call graph arc sorting
Details sorting individual parents/children within each call graph entry
64 - Reading histogram and call graph records
Shows address ranges of histograms as they are read, and each
call graph arc
128 - Symbol table
Reading, classifying, and sorting the symbol table from the object file.
For line-by-line profiling (`-l' option), also shows line numbers
being assigned to memory addresses.
256 - Static call graph
Trace operation of `-c' option
512 - Symbol table and arc table lookups
Detail operation of lookup routines
1024 - Call graph propagation
Shows how function times are propagated along the call graph
2048 - Basic-blocks
Shows basic-block records as they are read from profile data
(only meaningful with `-l' option)
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