在 CMake 中，如何找到包含文件的目录? [英] In CMake, how can I find the directory of an included file?

问题描述

假设我的项目的 CMakeLists.txt 包含 foo.cmake:

Suppose my project's CMakeLists.txt includes foo.cmake:

include(foo)

在foo.cmake中，我想知道foo.cmake的路径.
我该怎么做?

In foo.cmake, i want to know the path of foo.cmake.
How can I do that?

请注意，CMAKE_CURRENT_LIST_DIR 给出了包含 CMakeLists.txt 的目录，而不是包含的 foo.cmake 的目录，因此不是我想要什么.

Note that CMAKE_CURRENT_LIST_DIR gives the directory of the including CMakeLists.txt, not that of the included foo.cmake, and is thus not what I want.

当然，foo.cmake 可能包含在多个项目中(即，包含在多个 CMakeLists.txt 文件中).

Of course, foo.cmake might be included by several projects (i.e., by several CMakeLists.txt files).

推荐答案

人们已经报告了关于 CMAKE_CURRENT_LIST_DIR 行为的看似矛盾的事实.现在我知道混乱的原因了:

People have reported seemingly contradictory facts about how CMAKE_CURRENT_LIST_DIR behaves. Now I know the reason for the confusion:

首先，在我的 Linux 环境中:

First, in my Linux environment:

$ cd /path/to/home  
$ mkdir cmake-test  
$ cd cmake-test  
$ mkdir source  
$ mkdir source/subdirectory  
$ mkdir build  

我创建了这两个文件:

$ cat source/CMakeLists.txt  
include(subdirectory/foo.cmake)  

$ cat source/subdirectory/foo.cmake  
message("CMAKE_CURRENT_LIST_DIR is ${CMAKE_CURRENT_LIST_DIR}")  

CMake 的工作原理由 Fraser 和 Robert Dailey 报告:

CMake works as reported by Fraser and Robert Dailey:

$ cd build  
$ cmake ../source  
CMAKE_CURRENT_LIST_DIR is /path/to/home/cmake-test/source/subdirectory  
[...]  

但是，我向 foo.cmake 添加了一个函数，该函数是从 CMakeLists.txt 调用的:

However, I add a function to foo.cmake, which I call from CMakeLists.txt:

$ cat ../source/subdirectory/foo.cmake  
message("CMAKE_CURRENT_LIST_DIR is ${CMAKE_CURRENT_LIST_DIR}")  
function(bar)  
    message("CMAKE_CURRENT_LIST_DIR in bar() is ${CMAKE_CURRENT_LIST_DIR}")  
endfunction()  

$ cat ../source/CMakeLists.txt  
include(subdirectory/foo.cmake)  
bar()  

那么:

$ cmake ../source  
CMAKE_CURRENT_LIST_DIR is /path/to/home/cmake-test/source/subdirectory  
CMAKE_CURRENT_LIST_DIR in bar() is /path/to/home/cmake-test/source  
[...]  

因此，foo.cmake 中 CMAKE_CURRENT_LIST_DIR 的值在包含 foo.cmake 和调用 bar() 时并不相同.这是根据 CMAKE_CURRENT_LIST_DIR 的规范.

So, the value of CMAKE_CURRENT_LIST_DIR in foo.cmake is not the same at the time foo.cmake is included and when bar() is called. This is according to the specification of CMAKE_CURRENT_LIST_DIR.

这是从 bar() 中访问 foo.cmake 目录的一种可能的解决方案:

Here is one possible solution for accessing the directory of foo.cmake from within bar():

$ cat ../source/subdirectory/foo.cmake  
set(DIR_OF_FOO_CMAKE ${CMAKE_CURRENT_LIST_DIR})  
function(bar)  
    message("DIR_OF_FOO_CMAKE in bar() is ${DIR_OF_FOO_CMAKE}")  
endfunction()  

之后我得到了我正在寻找的行为:

after which I get the behavior I was looking for:

$ cmake ../source  
DIR_OF_FOO_CMAKE in bar() is /path/to/home/cmake-test/source/subdirectory  
[...]  

这篇关于在 CMake 中，如何找到包含文件的目录?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！