macOS DYLD

file.c

#include <stdio.h>

__attribute__((constructor))
static void initializer1() {
    printf("[%s] [%s]\n", __FILE__, __FUNCTION__);
}

__attribute__((constructor))
static void initializer2() {
    printf("[%s] [%s]\n", __FILE__, __FUNCTION__);
}

__attribute__((constructor))
static void initializer3() {
    printf("[%s] [%s]\n", __FILE__, __FUNCTION__);
}

__attribute__((destructor))
static void finalizer1() {
    printf("[%s] [%s]\n", __FILE__, __FUNCTION__);
}

__attribute__((destructor))
static void finalizer2() {
    printf("[%s] [%s]\n", __FILE__, __FUNCTION__);
}

__attribute__((destructor))
static void finalizer3() {
    printf("[%s] [%s]\n", __FILE__, __FUNCTION__);
}

Output

$ gcc -dynamiclib -o test.dyld file.c
$ gcc trial.c
$ ./a.out
[file.c] [initializer1]
[file.c] [initializer2]
[file.c] [initializer3]
[trial.c] [main] Finished loading. Now quitting.
[file.c] [finalizer3]
[file.c] [finalizer2]
[file.c] [finalizer1]

trial.c

#include <stdio.h>
#include <dlfcn.h>

int main(int argc, char** argv) {
    void *lib = dlopen("./test.dyld", RTLD_LAZY);

    printf("[%s] [%s] Finished loading. Now quitting.\n", __FILE__, __FUNCTION__);

    return 0;

}