GDB

• Compile your program with -g to add debugging symbols -ggdb adds even more symbols
• Starting gdb and emacs gud-gdb mode
  • on command line: gdb <program name>
  • In emacs: M-x gud-gdb
  • In emacs 22 or older: M-x gdb
  • M-x gdb works on later version of emacs, too, but it has changed in ways that I don't understand, while M-x gud-gdb invokes the old, pre-emacs 23 behavior.

GDB Commands

• run
  • Runs the program
• backtrace (bt)
  • prints the stack trace (all stack frames)
• up
  • Move up the stack (toward main())
• down
  • Moves down (away from main())
• break
  • Set a breakpoint
  • takes a function name, a line number, or a file:line number, or an address
• (s)tep
  • Step into a function call
• (n)ext
  • step over a function call
• print
  • print a variable
  • 'set print pretty' gives nicer output
• list
  • list code around the current line
  • Not particularly useful in emacs, but necessary in the shell.
• (c)ontinue
  • Continue execution
• clear
  • delete a breakpoint
• delete
  • delete all breakpoints