gcc hello world

gistfile1.c

#include <stdio.h>

__attribute__((section(".plt"))) main;

__attribute__((constructor, destructor)) void _() {
    if (main) {
        __attribute__((cleanup(puts))) char _[] = "world!";
    } else {
        __attribute__((cleanup(printf))) char _[] = "Hello, ";
        main = 0xc3;
    }
}