CMake include_directories和add_subdirectory之间的区别? [英] CMake Difference between include_directories and add_subdirectory?

问题描述

我正在学习CMake来构建C ++代码，并努力遵循以下概念.在我的根目录下，我有一些cpp文件和CMakeLists.txt，它们在gen-cpp目录中成功生成了节俭代码.我的根目录CMakeLists.txt包含:

I'm learning CMake for building C++ code, and struggling with the following concept. On my root level directory I have some cpp files and a CMakeLists.txt that succesfully generates some thrift code in a gen-cpp directory. My root level CMakeLists.txt contains :

include_directories("root路径"/gen-cpp).(以及相关的节俭自动生成和包含.

include_directories("path-to-root"/gen-cpp). (along with the relevant thrift auto-generating and includes.

一切都可以编译，但是对于引用gen-cpp目录中定义的类的未定义符号，我得到了运行时动态库链接错误.当我将目录中的文件移动到根级别时，它运行良好.我想念什么?(我还调整了根级别cpp目录中的#include，使其指向"root路径"/gen-cpp).

Everything compiles ok but I get run time dynamic library linked errors for undefined symbol referencing a class defined in the gen-cpp directory. When I move the files in the directory to the root level, it runs fine. what am I missing? (I had also adjusted the #include in the root level cpp directorie s to point to "path-to-root"/gen-cpp).

这是对使用include_directory的误解，我应该在其中使用add_subdirectory.如果是后者，gen-cpp中的代码是否需要自己的CMakeLists.txt?当该目录的内容为根级别时，为什么不需要此附加文件?

Is this a misunderstanding of using include_directory, where I should be using add_subdirectory. If the latter, would the code in gen-cpp needs its own CMakeLists.txt? Why is this additional file not needed, when the contents of said directory are root level?

推荐答案

include_directories()用于添加标头搜索路径( -I 标志)和 add_subdirectory()在这种情况下不会有任何区别.

The include_directories() is used for adding headers search paths (-I flag) and add_subdirectory() will make no difference in this case.

我想，您需要在 add_executable()或 add_library()调用中列出gen-cpp文件夹中的* .cpp文件，您希望这些符号在会.

I suppose, you need to list *.cpp files from gen-cpp folder in add_executable() or add_library() calls, in which you wish these symbols to be.

或者，您可以将所有节俭的源代码编译到库中，并将其与您的代码链接.

Alternatively, you can compile all thrift sources into the library and link it with your code.

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