如注释中所述， target_include_directories 提供目录的路径，而不是文件的路径。

As stated in the comments, target_include_directories should be given a path to a directory, not to a file.

此外，如果要创建依赖关系 lib1 上的 lib2 ，您应该通过 target_link_libraries 进行操作：依赖关系不仅与包含目录有关，而且与编译选项，定义，目标属性有关……

Moreover, if you want to create a dependency for lib2 on lib1, you should do it through target_link_libraries: a dependency is not only about include directories, but also about compile options, definitions, target properties...

t arget_sources 不适用于接口库。通过此答案，您可以使用不带命令的自定义目标，而无需使用命令将源与目标关联，而不会影响构建过程（对于msvc，QtCreator和其他基于GUI的工具，这使得可通过IDE来访问源； AFAIK对其他构建工具无用）。

target_sources doesn't work with interface libraries. From this answer, You can use a custom target without commands to associate the sources to a target without impacting the build process (for msvc, QtCreator and other GUI-based tools, this makes the sources accessible through the IDE; AFAIK it's useless for other build tools).

您的cmake可能如下所示：

Your cmake may look like this:

add_library(lib1 INTERFACE)
target_sources(lib1 INTERFACE lib1.h)

target_include_directories(lib1 INTERFACE
    "${PROJECT_SOURCE_DIR}/lib1"
)

add_library(lib2 INTERFACE)
if(MSVC)
    add_custom_target(lib2.headers SOURCES lib2.h)
endif()

target_include_directories(lib2 INTERFACE
    "${PROJECT_SOURCE_DIR}/lib2"
)

target_link_libraries(lib2 INTERFACE lib1)

add_executable(project main.cc)
target_link_libraries(project lib2)

高级提示：您可以指定在 target_include_directories 中为构建树和安装树指定一个不同的目录（请参见文档）：

Advanced tip: you can specify a different directory in target_include_directories for the build tree and the install tree (see documentation):

target_include_directories(lib1 INTERFACE
    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/lib1>
    $<INSTALL_INTERFACE:${YOUR_INSTALL_DIR}/lib1>
)