您需要使用CMake目标及其属性：

You need to make use of the CMake targets and their properties:

MainProj / CMakeLists.txt：

MainProj/CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project(MainProj)

# Add sub-directories
add_subdirectory(ProjLib)
add_subdirectory(ProjExec)

b $ b

ProjLib / CMakeLists.txt

ProjLib/CMakeLists.txt

add_library(ProjLib SHARED src/proj_lib.cc)
target_include_directories(ProjLib PUBLIC ${CMAKE_CURRENT_LIST_DIR}/include)

ProjExec / CMakeLists.txt

ProjExec/CMakeLists.txt

add_executable(ProjExec src/proj_exec.cc)
target_include_directories(ProjExec PRIVATE ${CMAKE_CURRENT_LIST_DIR}/include)
target_link_libraries(ProjExec ProjLib)

target_link_libraries 目标，其依赖项的PUBLIC和INTERFACE包括目录将被适当地使用。

target_link_libraries makes sure that when building a target, its dependencies' PUBLIC and INTERFACE include directories will be used appropriately.