内联目标文件中的函数 [英] Inlining functions from object files

问题描述

我要内联的一些功能，而我没有code。他们在目标文件present。有没有办法用gcc做呢？

I want to inline some functions of which I don't have the code. They are present in an object file. Is there a way to do it with gcc?

在换句话说，我希望在联我自己的code文件，包含这些函数的目标文件来执行这些功能的内联。

In other words, I want to perform inlining of those functions while linking my own code files with the object file that contain those functions.

推荐答案

4.5版本开始，GCC支持-flto开关使链接时优化（LTO）。 LTO可以从单独的对象文件内联函数。

Starting with version 4.5, GCC supports the -flto switch which enables Link Time Optimization (LTO). LTO can inline functions from separate object files.

有一个陷阱，但。由于的 -flto 的工作方式，它会只使用对象文件中使用开关编译的。据我了解，GCC通过将源$ C ​​$ C的中间形式到目标文件实现LTO - 如果这中间code是不是对象文件，该对象文件中的code赢了'T是'内联'。

There's a catch though. Because of the way that -flto works, it'll only be of use for object files that were compiled using that switch. As I understand it, GCC implements LTO by placing a intermediate form of the source code into the object file - if that intermediate code isn't in the object file, the code in that object file won't be 'inlined'.

请参阅Can链接器内联函数？的一些其他细节。

See Can the linker inline functions? for some additional details.

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