C++ g++ __static_initialization_and_destruction_0(int, int) - 它是什么
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g++ __static_initialization_and_destruction_0(int, int) - what is it
提问by osgx
After compiling of c++ file (with global static object) I get in nmoutput this function:
编译 c++ 文件（带有全局静态对象）后，我得到了nm这个函数的输出：
00000000 t _Z41__static_initialization_and_destruction_0ii
__static_initialization_and_destruction_0(int, int) /* after c++filt */
What is it? It will call __cxa_atexit()
它是什么？它会调用__cxa_atexit()
Can I disable generation of this function (and calling a __cxa_atexit()) and put all constructor and destructor calls to .ctorsand .dtorssections?
我可以禁用此函数的生成（并调用 a __cxa_atexit()）并将所有构造函数和析构函数调用放到.ctors和.dtors部分吗？
采纳答案by Xepo
This doc file seems to tell ya all you'd wanna know about those functions: http://www.nsnam.org/docs/linker-problems.doc
这个文档文件似乎告诉你所有你想知道的关于这些功能的信息：http: //www.nsnam.org/docs/linker-problems.doc
From what I can grok, gcc creates a __static_initialization_and_destruction_0for every translation unit that needs static constructors to be called. Then it places __do_global_ctors_auxinto the .ctorssection, which then calls __static_initialization_and_destruction_0on each translation unit.
据我所知，gcc__static_initialization_and_destruction_0为每个需要调用静态构造函数的翻译单元创建了一个。然后它__do_global_ctors_aux放入.ctors部分，然后调用__static_initialization_and_destruction_0每个翻译单元。
The issue seems to be a lot more complex than that though; gcc has to deal with individual object files in an archive, and I think this is how they keep the linker from optimizing out those calls.
不过，这个问题似乎要复杂得多；gcc 必须处理存档中的单个目标文件，我认为这就是它们防止链接器优化这些调用的方式。
