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This tool can be used to display which functions are called in a complex program. Public Domain license with the extra stipulation that the author is not held liable for any results of this software's usage. Usage: gcc -O0 -g -finstrument-functions my_code.c trace.c ./a.out 2>&1 > log grep "funcall" log > log2 #strip your program's actual output ruby pflog.rb log2 | c++filt -n | sort -u | less #show unique functions WARNING: this is a quick hack -- use at your own risk!