gcc warn when pointers not checked non-null before de-referencing.

[Jonny Grant]

Hello

This isn't real code, just an example to show.

I've tried with:  -Wall -Wextra -O2  and some other warnings, but couldn't get this to generate a warning that *g was possibly de-referenced. May I ask, does GCC have a way to get warnings when pointers are not checked?
I had a look but -Wnull-dereference didn't help.

#include <stdlib.h>

#include <cstddef>
void f(int * g)
{
    *g = 1;

    if(NULL == g)
    {
        exit(1);
    }
}

Best regards Jonny