c const

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#ifdef SEGFAULT
char * const s = "str";
#endif

void segfault(char **p)
{
    *p = "hello";
}

int main(void)
{
#ifndef SEGFAULT
    char * const s = "str";
#endif
    segfault((char **)&s);
    printf("%s\n", s);
    return 0;
}