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Gdb - The GNU Debugger
A powerful command line debugger
- ddd - Data Display Debugger - graphical and very good for complex data structures
- Insight - another graphical frontend
- Emacs has interface
Compile source with -g for debug symbols
While 'gdb' is command line based there are lets of graphical interfaces. In particular 'ddd' is really useful for examining complex data structures.
Gdb is most useful when your code is compiled with the '-g' flag (on gcc) which causes the compiler to add extra information to the executable; saying which bits of code correspond to which lines of source. Note this can get confusing when optimisation is also on.
So compile the example program 'seggy.c' with:
gcc -g seggy.c -o seggy