如何修复创建使用私有include\u目录的库的cmake配置

我正在学习如何编写“现代”cmake配置，并试图创建一个库与可执行文件的链接。我的测试项目结构如下所示：

.
|-- foo
|   |-- src
|   |   |-- foo.cpp
|   |   `-- foo_impl.cpp
|   |-- include
|   |   `-- foo
|   |       `-- foo.h
|   |-- internal
|   |   `-- foo_impl.h
|   `-- CMakeLists.txt
|-- src
|   `-- main.cpp
`-- CMakeLists.txt

./CMakeLists.txt是

cmake_minimum_required(VERSION 3.12)

project(test_cmake LANGUAGES CXX)

add_subdirectory(foo)
add_executable(test_executable
  src/main.cpp
  )

target_include_directories(test_executable
  PRIVATE
    include
    foo
  )

cmake_minimum_required(VERSION 3.12)

add_library(foo
  src/foo_impl.cpp
  src/foo.cpp
  )

target_include_directories(foo
  PUBLIC
    include
  PRIVATE
    ${CMAKE_CURRENT_SOURCE_DIR}
  )

/foo/CMakeLists.txt是

cmake_minimum_required(VERSION 3.12)

project(test_cmake LANGUAGES CXX)

add_subdirectory(foo)
add_executable(test_executable
  src/main.cpp
  )

target_include_directories(test_executable
  PRIVATE
    include
    foo
  )

cmake_minimum_required(VERSION 3.12)

add_library(foo
  src/foo_impl.cpp
  src/foo.cpp
  )

target_include_directories(foo
  PUBLIC
    include
  PRIVATE
    ${CMAKE_CURRENT_SOURCE_DIR}
  )

此配置的理由是测试cmake是否向库foo的客户端公开“foo/internal”文件夹

与库foo链接有困难

无法在客户端代码中使用#include“foo/foo.h”

---

我的配置有错误吗？

您的cmake中有一个类型/错误

在CMakeLists.txt中，您可以执行以下操作：

target_include_directories(test_executable

这将添加include目录。您需要链接到

foo

项目：

target_link_libraries(test_executable
    PRIVATE foo)

---

您的cmake中有一个类型/错误

在CMakeLists.txt中，您可以执行以下操作：

target_include_directories(test_executable

这将添加include目录。您需要链接到

foo

项目：

target_link_libraries(test_executable
    PRIVATE foo)