为什么我的 INCLUDE_DIRECTORIES 和 INTERFACE_INCLUDE_DIRECTORIES 属性在 Cmake 中为空？

Question

target_include_directories在此代码中，我在属性 INCLUDE_DIRECTORIES 和 INTERFACE_INCLUDE_DIRECTORIES 中添加字符串“${PROJECT_BINARY_DIR}”。但是，当我运行 Cmake 时，我发现命令中message这两个属性为空。

cmake_minimum_required(VERSION 3.10)

# set the project name and version
project(Tutorial VERSION 1.0)

# specify the C++ standard
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

# configure a header file to pass some of the CMake settings
# to the source code
configure_file(TutorialConfig.h.in TutorialConfig.h)

# add the executable
add_executable(Tutorial tutorial.cxx)

# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
target_include_directories(Tutorial
                            PUBLIC "${PROJECT_BINARY_DIR}"
                           )

get_property(inc_dirs DIRECTORY PROPERTY INCLUDE_DIRECTORIES)
message("INCLUDE_DIRECTORIES = ${inc_dirs}")

get_property(interface_inc_dirs DIRECTORY PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
message("INTERFACE_INCLUDE_DIRECTORIES = ${interface_inc_dirs}")

有人知道为什么吗？

谢谢！

Answer 1

您正在获取DIRECTORY属性。您需要TARGET可执行目标的属性。

target_include_directories基于TARGET。

get_target_property(inc_dirs Tutorial INCLUDE_DIRECTORIES)
message("INCLUDE_DIRECTORIES = ${inc_dirs}")

get_target_property(interface_inc_dirs Tutorial INTERFACE_INCLUDE_DIRECTORIES)
message("INTERFACE_INCLUDE_DIRECTORIES = ${interface_inc_dirs}")