这招对我很管用:

set(SOURCE main.cpp)
add_executable(${PROJECT_NAME} ${SOURCE})

# target_include_directories must be added AFTER add_executable
target_include_directories(${PROJECT_NAME} PUBLIC ${INTERNAL_INCLUDES})

如果与其他创建Makefile的方法(例如make或qmake)相比，CMake更像是一种脚本语言。它不像Python那样酷，但仍然很酷。

如果在各种开源项目中寻找人们如何包含目录，就没有“适当的方法”这样的东西。但是有两种方法。

Crude include_directories will append a directory to the current project and all other descendant projects which you will append via a series of add_subdirectory commands. Sometimes people say that such approach is legacy. A more elegant way is with target_include_directories. It allows to append a directory for a specific project/target without (maybe) unnecessary inheritance or clashing of various include directories. Also allow to perform even a subtle configuration and append one of the following markers for this command.

PRIVATE -仅用于此指定的构建目标

PUBLIC -用于指定目标和与此项目相关的目标

INTERFACE——仅用于与当前项目链接的目标

PS:

这两个命令都允许将目录标记为SYSTEM，以提示指定的目录是否包含警告与您无关。 类似的答案是其他成对的命令target_compile_definitions/add_definitions, target_compile_options/CMAKE_C_FLAGS

我使用的是CLion，我的项目结构如下:

--main.cpp
--Class.cpp
--Class.h
--CMakeLists.txt

修改前的CMakeLists.txt:

add_executable(ProjectName main.cpp)

修改后的CMakeLists.txt:

add_executable(ProjectName main.cpp Class.cpp Class.h)

通过这样做，程序编译成功。

你有两个选择。

旧:

include_directories(${PATH_TO_DIRECTORY})

而新的

target_include_directories(executable-name PRIVATE ${PATH_TO_DIRECTORY})

要使用target_include_directories，您需要定义可执行文件- add_executable(executable-name sourcefiles)。

所以你的代码应该是这样的

add_executable(executable-name sourcefiles)
target_include_directories(executable-name PRIVATE ${PATH_TO_DIRECTORY})

你可以在这里阅读更多内容https://cmake.org/cmake/help/latest/command/target_include_directories.html

不要忘记包含${CMAKE_CURRENT_LIST_DIR}。 这就是给我带来麻烦的原因。

示例应该是这样的:

target_include_directories(projectname
    PUBLIC "${CMAKE_CURRENT_LIST_DIR}/include"                          
)

PUBLIC用于您想要包含在父项目中的依赖项。 对于那些你不喜欢的人来说是私密的。

这招对我很管用:

set(SOURCE main.cpp)
add_executable(${PROJECT_NAME} ${SOURCE})

# target_include_directories must be added AFTER add_executable
target_include_directories(${PROJECT_NAME} PUBLIC ${INTERNAL_INCLUDES})