Why GDB jumps unpredictably between lines and prints variables as “”?

Question

Can anyone explain this behavior of gdb?

900         memset(&new_ckpt_info,\'\\0\',sizeof(CKPT_INFO));
(gdb)
**903         prev_offset   = cp_node->of         


        

Answer 1

You pretty much can't set the value of found. Debugging optimized programs is rarely worth the trouble, the compiler can rearrange the code in ways that it'll in no way correspond to the source code (other than producing the same result), thus confusing debuggers to no end.