Module init with section attributes

ModuleInit.cc

#include <iostream>

#define REGISTER_MODULE(module_name) InitializeFunction init_module_##module_name __attribute__((used, section("__DATA,__MODULEINIT"))) = module_name;

typedef void (*InitializeFunction)(void);

void module1(void)
{
    std::cout << "module1 init..." << std::endl;
}

void module2(void)
{
    std::cout << "module2 init..." << std::endl;
}

REGISTER_MODULE(module1);
REGISTER_MODULE(module2);

extern void* __start_MODULEINIT __asm("section$start$__DATA$__MODULEINIT");
extern void* __stop_MODULEINIT  __asm("section$end$__DATA$__MODULEINIT");

void init_all_modules()
{
    size_t count = ((size_t)&__stop_MODULEINIT - (size_t)&__start_MODULEINIT) / sizeof(InitializeFunction);
    InitializeFunction* ptr_module = (InitializeFunction*)&__start_MODULEINIT;
    for (size_t i = 0; i < count; ++i)
    {
        (*ptr_module)();
        ++ptr_module;
    }
}

int main(int argc, char** argv)
{
    (void)argc;
    (void)argv;
    init_all_modules();
    return 0;
}