gdb trick: automatically display local variables when stops

Add the following to ~/.gdbinit

define toggle-local
  if $toggle_hook_enabled == 0
    set $toggle_hook_enabled = 1
    define hook-stop
      info local
      printf "---------------------\n"
    end
    printf "display-local enabled.\n"
  else
    set $toggle_hook_enabled = 0
    define hook-stop
    end
    printf "display-local disabled.\n"
  end
end

set $toggle_hook_enabled = 0

Usage

When in gdb session, use "toggle-local" to toggle it.

Why not always turn it on? If there are too many local variables, gdb would use pagination to show all the infomation, sometimes it's kind of annoying to press an addition Enter.