“please check gdb is codesigned” – macOS Sierra

Running GDB on macOS Sierra failed with the error below:
Starting program: /Users/gaurabb/Desktop/Coding-Projects/CLang/a.out
Unable to find Mach task port for process-id 68306: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))
Steps I followed to address this (based on references at the end):
Step 1: Codesign GDB following steps
Step 1.1
MAC-Err-1
Step 1.2
MAC-Err-2
Step 1.3
MAC-Err-4
Step 1.4
MAC-Err-4
Step 1.5
MAC-Err-6
Step 1.6
MAC-Err-6
Step 2: 
    Step 2.1: Create a file named .gdbinit in the /Users/<username>
    Step 2.2: Add the following to the file:  set startup-with-shell off
                    This disables use of a shell that GDB uses to start the program in Unix based systems
Step 3: Open a terminal and run:
 sudo killall taskgated
taskgated is a system daemon that implements a policy for the task_for_pid system service.  When the kernel is asked for the task port of a process, and preliminary access control checks pass, it invokes this daemon (via launchd) to make the decision.
Step 4: In the terminal, run:
 codesign -f -s "gdb-cert" /usr/local/bin/gdb 
These steps  should address the error.

References: