Clang constructor and destructor attributes

attribute.c

// clang attribute.c -o attribute
#include <stdio.h>
int main(int argc, char *argv[]) {
    printf("Hello World!\n");
    return 0;
}

__attribute__((constructor)) static void beforeFunction()
{
    printf("beforeFunction\n");
}

__attribute__((destructor)) static void afterFunction()
{
	printf("afterFunction\n");
}

__attribute__((constructor(101))) static   void before1()
{
    
    printf("before1\n");
}

__attribute__((constructor(102))) static   void before2()
{
    
    printf("before2\n");
}

__attribute__((constructor(102))) static   void before3()
{
    
    printf("before3\n");
}

__attribute__((destructor(101))) static void after1()
{
	printf("after1\n");
}

__attribute__((destructor(102))) static void after2()
{
	printf("after2\n");
}

__attribute__((destructor(103))) static void after3()
{
	printf("after3\n");
}