C++ 如何正确链接子目录中的静态库？

我正在尝试链接一个静态库，该库是我使用CMake构建的，并且有一个子目录结构。它看起来像这样（

->

表示一个目录）：

在Root的cmake文件中：

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

project(First)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

add_library(First STATIC Object/object.cpp Object/object.hpp)
add_dependencies(First Second Third)

target_link_libraries( First Second Third)

project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(Main First Second Third)

add_executable(Main main.cpp)
target_link_libraries(Main First Second Third)

在First的cmake文件中：

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

project(First)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

add_library(First STATIC Object/object.cpp Object/object.hpp)
add_dependencies(First Second Third)

target_link_libraries( First Second Third)

project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(Main First Second Third)

add_executable(Main main.cpp)
target_link_libraries(Main First Second Third)

第二和第三是相似的，但第二只依赖于第三，第三根本不依赖任何东西。当我尝试将其与Main的cmake文件链接时，问题出现了：

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

project(First)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

add_library(First STATIC Object/object.cpp Object/object.hpp)
add_dependencies(First Second Third)

target_link_libraries( First Second Third)

project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(Main First Second Third)

add_executable(Main main.cpp)
target_link_libraries(Main First Second Third)

当我从一个构建文件夹运行

cmake..

时，它会很开心，不会抱怨。但是，当我在GUI中点击make或Generate for Windows时，我会收到一个投诉，即

object.hpp:没有这样的文件或目录

。我正在

main.cpp

中包含此内容。很明显，我可以将其更改为

#include

，但我觉得这违背了链接到库中的目的。（也许这是错误的想法）

我也遇到过类似的问题，在类似这样的其他结构中，在像

object.cpp

这样的文件中，我需要执行

#包括“object/object.hpp”

，即使

object.hpp

与

object.cpp

位于同一目录中

---

如何正确地首先将project Main链接到project，这样我就不必

#包含
？还是这是唯一的办法？还是我走错了方向
 对于我来说，我的
CMakeLists.txt
的以下解决方案是可行的。我还认为您只需要在顶级目录中调用一次
add_project

添加额外的依赖项似乎是超级棒，因为CMake fill通过
target\u link\u库
来解决这个问题。我能够运行CMake并构建项目，但除了
main.cpp
之外，我的文件都是空的

这是我的CMakeLists.txt

First/CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

Second/CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

Third/CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

对我来说，我的
CMakeLists.txt
的以下解决方案是可行的。我还认为您只需要在顶级目录中调用一次
add_project

添加额外的依赖项似乎是超级棒，因为CMake fill通过
target\u link\u库
来解决这个问题。我能够运行CMake并构建项目，但除了
main.cpp
之外，我的文件都是空的

这是我的CMakeLists.txt

First/CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

Second/CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

Third/CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

CMakeLists.txt

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)    
add_library(First STATIC Object/object.cpp Object/object.hpp)    
target_link_libraries( First Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Second STATIC secondObject.cpp secondObject.hpp)
target_link_libraries( Second Third)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_library(Third STATIC thirdObject.cpp thirdObject.hpp)

cmake_minimum_required(VERSION 3.0)
project(Main)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

include_directories(First)
include_directories(Second)
include_directories(Third)

add_subdirectory(First)
add_subdirectory(Second)
add_subdirectory(Third)
add_subdirectory(Main)

只需将
target\u include\u目录（第一个公共对象）
添加到
First/CMakeLists
，即可将该路径作为include目录导出到与First链接的其他项目中。只需将
target\u include\u目录（第一个公共对象）
添加到
First/CMakeLists
，将该路径作为包含目录导出到与第一个链接的其他项目。