Stack hack

confusion.c

#include <stdio.h>

static char *S[] = { "Hello ", "world!\n" };

static
void print_me(int kek, const char p[static sizeof printf])
{
    (void)p;
    (**((void (**)(char *, char *))
        ((&kek - sizeof kek) + 1)))
        ("%s", S[kek]);
}

__attribute__((constructor))
int main(void)
{
    static int i = 0;

    ((int (*)(int, char *))(&print_me))
        (i++, (void *)&printf);
    return 0;
}