如何判断头文件是从哪里包含的? [英] How to tell where a header file is included from?

问题描述

我如何知道 g++ 在哪里能够找到包含文件?基本上如果我

How can I tell where g++ was able to find an include file? Basically if I

#include <foo.h>

g++ 将扫描搜索路径，使用任何包含选项来添加或更改路径.但是，归根结底，有没有办法告诉我 g++ 选择编译的 foo.h 的绝对路径?如果在无数搜索路径中存在多个 foo.h，则尤其相关.

g++ will scan the search path, using any include options to add or alter the path. But, at the end of days, is there a way I can tell the absolute path of foo.h that g++ chose to compile? Especially relevant if there is more than one foo.h in the myriad of search paths.

缺少一种实现方式...有没有办法让 g++ 告诉我在包含默认值和所有包含选项后它的最终搜索路径是什么?

Short of a way of accomplishing that... is there a way to get g++ to tell me what its final search path is after including defaults and all include options?

推荐答案

这将给出列出包含文件绝对路径的 make 依赖项:

This will give make dependencies which list absolute paths of include files:

gcc  -M showtime.c

如果您不希望系统包含(即#include )，请使用:

If you don't want the system includes (i.e. #include <something.h>) then use:

gcc  -MM showtime.c

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