将所有框架链接为可选 [英] Linking all frameworks as optional

问题描述

我阅读了此文档文章关于库和框架链接，下面的部分引起了我的注意:

I read this documentation article about library and framework linking and the section below drew my attention:

...仅在需要时才会加载可选框架.如果将不需要的大型库指定为Optional，则应用程序的初始加载会更快.

... an Optional framework will be loaded only if needed. The initial load of the application will be faster if a large library that is never needed is designated as Optional.

所以我问为什么不将所有框架都设置为 Optional ，如果它们在必要时会加载?缺点是什么?

So I'm asking why wouldn't I set all frameworks as Optional, if they will load when necessary? What would be the drawback?

推荐答案

使用可选库需要其他代码，因为它利用了

Using optional libraries requires additional code as it makes use of weak linking:

if (MyWeakLinkedFunction != NULL)
{
    result = MyWeakLinkedFunction();
}

这使得使用该库有些痛苦；我宁愿知道该符号在程序加载时可用，如果不是，则O/S可以告诉用户.

That makes using the library something of a pain; I would rather know that the symbols are available when the program loads, and if they are not the O/S can deal with telling the user.

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