CMake子目录依赖 [英] CMake subdirectories dependency

问题描述

我是CMake的新手。事实上，我通过Kdevelop4 widh C ++尝试。

我有为每个我创建的命名空间创建子目录的习惯，即使所有的源必须编译和链接转换为单个可执行文件。好吧，当我在kdevelop下创建一个目录，它用一个add_subdirectory命令更新CMakeLists.txt，并在它下面创建一个新的CMakeLists.txt，但单独不会将其下的源码添加到编译列表。

我有根CMakeLists.txt如下：

 
 
项目（gear2d）
 
 add_executable（gear2d object.cc main.cc）
 
 add_subdirectory（component）
 

在组件/我有我想要编译和链接的来源，以产生gear2d可执行文件。

CMake常见问题有这个条目，但如果这是答案，我宁愿留在纯makefile。

有办法吗？

<添加一个子目录不能指定CMake进入目录，并在那里寻找另一个CMakeLists.txt。您仍然需要使用 add_library target_link_libraries 将其链接到您的可执行文件。类似如下：

在子文件夹CMakeLists.txt

  set（component_SOURCES ...）＃为此处的组件添加源文件
＃可以使用文件glob（取消注释下一行）
＃file（GLOB component_SOURCES * .cpp）
 
 add_library（component $ {component_SOURCES}）
  

Top-dir CMakeLists.txt

  project（gear2d）
 add_subdirectory（component）
 add_executable（gear2d object.cc main.cc）
 target_link_libraries（gear2d component）
  

I am very new to CMake. In fact, I am trying it through Kdevelop4 widh C++.

I have the habit of creating subdirs for every namespace I create, even if all the sources must be compiled and linked into a single executable. Well, when i create a directory under kdevelop, it updates CMakeLists.txt with a add_subdirectory command and creates a new CMakeLists.txt under it, but that alone does not add the sources under it to the compilation list.

I have the root CMakeLists.txt as follows:

project(gear2d)

add_executable(gear2d object.cc main.cc)

add_subdirectory(component)

Under component/ I have the sources I want to be compiled and linked to produce the gear2d executables. How can I accomplish that?

CMake FAQ have this entry but if thats the answer I'd rather stay with plain Makefiles.

Is there a way of doing this?

解决方案

Adding a subdirectory does not do much more than specify to CMake that it should enter the directory and look for another CMakeLists.txt there. You still need to create a library with the source files with add_library and link it to your executable with target_link_libraries. Something like the following:

In the subdir CMakeLists.txt

set( component_SOURCES ... ) # Add the source-files for the component here
# Optionally you can use file glob (uncomment the next line)
# file( GLOB component_SOURCES *.cpp )below

add_library( component ${component_SOURCES} )

Top-dir CMakeLists.txt

project( gear2d )
add_subdirectory( component )
add_executable( gear2d object.cc main.cc )
target_link_libraries( gear2d component )

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