如何在 CMake 中正确创建目标之间的依赖关系?

问题描述

我正在尝试使用 CMake 在 C++ 项目与其使用的库之间设置一些简单的依赖关系.

I am trying to use CMake to set up some simple dependencies between a C++ project and the libraries that it uses.

设置如下

• 项目
  • 依赖

  项目本身包含的源文件包含来自 Dependency 的头文件，并且在构建可执行文件时，它需要链接到 Dependency 的静态库.

  Project itself contains source files that include headers from Dependency and when the executable is built it needs to be linked against Dependency's static library.

  到目前为止我可以让它工作，但我必须在ProjectCMakeLists.txt文件中指定Dependency的包含目录> 手动.我希望它被自动拉出，并且我已经探索了使用 find_package() 命令这样做的选项，但成功率有限，并使事情变得更加复杂.

  So far I can get this to work, but I have to specify the include directories of Dependency in the CMakeLists.txt file for Project manually. I want this to be pulled out automatically, and I have explored the option of using the find_package() command to do so with limited success and making things much more complicated.

  我想要做的就是在 Project 之前构建 Dependency 并具有针对库的 Project 链接及其包含目录.有没有简单简洁的方法来实现这一点?

  All I want to do is have Dependency built before Project and have Project link against the library and have its include directories. Is there a simple concise way of achieving this?

  我当前的 CMake 文件:

  My current CMake files:

  项目，文件CMakeLists.txt:

  cmake_minimum_required (VERSION 2.6)
  project (Project)
  include_directories ("${PROJECT_SOURCE_DIR}/Project")
  add_subdirectory (Dependency)
  add_executable (Project main.cpp)
  target_link_libraries (Project Dependency)
  add_dependencies(Project Dependency)
  

  依赖，文件CMakeLists.txt:

  project(Dependency)
  add_library(Dependency SomethingToCompile.cpp)
  target_link_libraries(Dependency)
  

  推荐答案

  从 CMake 2.8.11 开始，您可以使用 target_include_directories.只需在您的 DEPENDENCY 项目中添加此功能并填写您希望在主项目中看到的包含目录即可.CMake 会关心其余的.

  Since CMake 2.8.11 you can use target_include_directories. Just simply add in your DEPENDENCY project this function and fill in include directories you want to see in the main project. CMake will care the rest.

  项目，CMakeLists.txt:

  PROJECT, CMakeLists.txt:

  cmake_minimum_required (VERSION 2.8.11)
  project (Project)
  include_directories (Project)
  add_subdirectory (Dependency)
  add_executable (Project main.cpp)
  target_link_libraries (Project Dependency)
  

  依赖，CMakeLists.txt

  DEPENDENCY, CMakeLists.txt

  project (Dependency)
  add_library (Dependency SomethingToCompile.cpp)
  target_include_directories (Dependency PUBLIC include)
  

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