#include <stdio.h>

void prt(void) {
    printf("1\n");
}

/*
clang -fPIC -c shared.c
ld -shared shared.o -o shared1.so

change print "1" to "2"

clang -fPIC -c shared.c
ld -shared shared.o -o shared2.so

cp shared1.so shared.so

*/