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 ：

  include（foo）
  

c $ c> foo.cmake ，我想知道 foo.cmake 的路径。

如何做到这一点？

请注意， CMAKE_CURRENT_LIST_DIR 会给出包括 CMakeLists.txt ，而不是包含的 foo.cmake ，因此不是我想要的。当然， foo.cmake 可能包含在几个项目中（也就是由几个 CMakeLists .txt files）。

解决方案

人们报告了CMAKE_CURRENT_LIST_DIR行为表面上看似矛盾的事实。现在我知道了造成混乱的原因：

首先，在我的Linux环境中：

 < code $ cd / path / to / home 
 $ mkdir cmake-test 
 $ cd cmake-test 
 $ mkdir源
 $ mkdir源/子目录
 $ mkdir build 
  

我创建了这两个文件：

  $ cat source / CMakeLists.txt 
 include（子目录/ foo.cmake）
 
 $ cat source / subdirectory / foo.cmake 
消息（CMAKE_CURRENT_LIST_DIR是$ {CMAKE_CURRENT_LIST_DIR}）
  

Robert Dailey：
$ b

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

我添加了一个函数foo.cmake，我从CMakeLists.txt中调用：
$ b $ $ $ $ $ $ $ $ $ $ .. ../source/subdirectory/ foo.cmake
消息（CMAKE_CURRENT_LIST_DIR is $ {CMAKE_CURRENT_LIST_DIR}）
函数（bar）
message（bar（）中的CMAKE_CURRENT_LIST_DIR是$ {CMAKE_CURRENT_LIST_DIR}）
endfunction（）

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

然后：

  $ cmake ../source 
 CMAKE_CURRENT_LIST_DIR是/ path / to / home / cmake-test / source / subdirectory 
 bar（）中的CMAKE_CURRENT_LIST_DIR是/ 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（）时是不相同的。这是根据CMAKE_CURRENT_LIST_DIR的规范。
 
 
 
这是从bar（）中访问foo.cmake目录的一个可能的解决方案：
 
 
  $ cat ../source/subdirectory/foo.cmake 
 set（DIR_OF_FOO_CMAKE $ {CMAKE_CURRENT_LIST_DIR}）
 function（bar）
消息（bar（）中的DIR_OF_FOO_CMAKE是$ {DIR_OF_FOO_CMAKE}）
 endfunction（）
  
 
 
 $ p 
 $ b $ $ $ $ c $ $ $ $ $ $ $ $ $ $ $ $ $ $ $在bar（）中是/ path / to / home / cmake-test / source /子目录
 [...] 
  

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

include(foo)

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

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.

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

解决方案

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

First, in my Linux environment:

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

I create these two files:

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

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

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  
[...]  

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()  

Then:

$ 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  
[...]  

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.

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()  

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  
[...]  

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