The gcc compiler by protects the stack if the option stack-protector is on.

This option can be turned on by using the option:

        gcc -fstack-protector prog.c -o prog
     

The compiler is typically installed with this option being the default.

It can be turned off by using the option:

        -fno-stack-protector

Example:
        gcc -fno-stack-protector prog.c -o prog