Linux——gdb debugging and makefile

1.gdb debugging

basic instruction

-g	Compile the executable file with this parameter to get the debug table
gdb ./a.out	Execute the debug file a.out
b  20	Set a breakpoint on line 20
run/r	run the program
n/next	Execute the next instruction (passes over the function)
s/step	Execute the next instruction (will enter the function)
p/print  i	Check the value of the variable i
continue	Continue to execute follow-up commands after power-off
quit	Exit gdb debugging

other instructions

run	Find where the segmentation fault occurs
finish	end the current function call
set args	Set the main function command line parameters
run string 1	Set the main function command line parameters
info b	View breakpoint information table
ptype	View variable type
bt	List the stack frames of the current program that are alive
frame	Switch stack frames according to the stack frame number
display	Set tracking variables
undisplay	Unset the tracking variable. number of tracked variables used

2.makefile