最近在开发一个组件，但是这个东西是以dll的形式发布的界面库，所以在开发的时候就需要上层调用。
如果你是很懂CMake的话，ui_xx.h的文件目录在
$
下
然后除了有关这个ui_xx.h，还有一些别的可以简单聊聊的
在使用CMake进行开发的时候，一般可以有一个上下级的关系，或者一般情况下上下级工程会摆在同一个文件夹下，对于我这个项目来说，View_Equalizer是Demo_View_Equalizer的依赖
在CMake中，如果工程之间有依赖，一般代表了几件事：
那我们一步步拆解地来看
可以直接在父工程中添加
add_subdirectory(./View_Equalizer)
的方式来添加子工程，这样的话View_Equalizer就会优先于当前工程进行编译了
这是因为，如果父工程如果不能引用到子工程的所有头文件的话，很有可能会出现无法编译的情况，即子工程引用了头文件，但是父工程则无法直接引用到所有的头文件，这样父工程的编译就会报错。
为了解决这个问题，我们需要在子工程中添加target_include_directories，以在作为子工程的时候向上传递包含列表
示例如下：
target_include_directories(View_Equalizer PUBLIC
${CMAKE_CURRENT_SOURCE_DIR}/math
${CMAKE_CURRENT_SOURCE_DIR}/QCustomPlot
${CMAKE_CURRENT_SOURCE_DIR}/includes
${CMAKE_CURRENT_SOURCE_DIR}/Views
${CMAKE_CURRENT_SOURCE_DIR}/View_Items
${CMAKE_CURRENT_BINARY_DIR})
需要注意的是，这里target_include_directories传递的是路径，而不是具体的文件，如果传递具体文件的话，上层仍然是找不到的，这里需要注意。
注：关于之前提到的找不到文件ui_xx.h的问题，这个其实就是没有写
target_include_directories(View_Equalizer PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
所有的ui_xx.h文件都会存放在${CMAKE_CURRENT_BINARY_DIR}下，所以将这个目录传递给上层，就不会出现找不到 ui_xx.h的情况了。
这个很好理解了，在父工程的CMakeLists.txt中添上这么一句话就行了
target_link_libraries(Demo_View_Equalizer PRIVATE View_Equalizer)
首先，当你在使用CMake编写Qt的时候，这三个属性是必不可少的
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
如果你想要添加ui或者qrc文件，同样的，需要将ui文件添加到add_library的名下，我这里是通过列表的形式插入所有需要的文件
set(HEADER_FILES
./includes/DataClass.h
./includes/View_Equalizer_global.h
./includes/math_functions.h
./includes/Center.h
./Views/view_equalizer.h
./View_Items/ViewItem_ControlPoint.h
./View_Items/PointWidget.h
)
set(SOURCE_FILES
./src/DataClass.cpp
./src/Center.cpp
./QCustomPlot/qcustomplot.cpp
./Views/view_equalizer.cpp
./View_Items/ViewItem_ControlPoint.cpp
./View_Items/PointWidget.cpp
)
set(UI_FILES
./View_Items/PointWidget.ui
)
add_library(View_Equalizer SHARED ${HEADER_FILES} ${SOURCE_FILES} ${UI_FILES} ${QRC_SOURCES})
当然了，既然是qt的库，对于ui文件和qrc文件，则需要加入以下两个命令：
qt5_add_resources(QRC_SOURCES ${RESOURCE_FILES})
qt5_wrap_ui(${UI_FILES})
子模块完整的CMakeLists.txt放在下面：
cmake_minimum_required(VERSION 3.5)
project(View_Equalizer LANGUAGES CXX)
#(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
find_package(Qt5 COMPONENTS Widgets PrintSupport REQUIRED)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/includes)
set(RESOURCE_FILES
./Resource/Resource.qrc
)
qt5_add_resources(QRC_SOURCES ${RESOURCE_FILES})
set(HEADER_FILES
./includes/DataClass.h
./includes/View_Equalizer_global.h
./includes/math_functions.h
./includes/Center.h
./Views/view_equalizer.h
./View_Items/ViewItem_ControlPoint.h
./View_Items/PointWidget.h
)
set(SOURCE_FILES
./src/DataClass.cpp
./src/Center.cpp
./QCustomPlot/qcustomplot.cpp
./Views/view_equalizer.cpp
./View_Items/ViewItem_ControlPoint.cpp
./View_Items/PointWidget.cpp
)
set(UI_FILES
./View_Items/PointWidget.ui
)
# 假设生成的头文件被放置在当前构建目录下的对应子目录中
qt5_wrap_ui(${UI_FILES})
add_library(View_Equalizer SHARED ${HEADER_FILES} ${SOURCE_FILES} ${UI_FILES} ${QRC_SOURCES})
target_include_directories(View_Equalizer PUBLIC
${CMAKE_CURRENT_SOURCE_DIR}/math
${CMAKE_CURRENT_SOURCE_DIR}/QCustomPlot
${CMAKE_CURRENT_SOURCE_DIR}/includes
${CMAKE_CURRENT_SOURCE_DIR}/Views
${CMAKE_CURRENT_SOURCE_DIR}/View_Items
${CMAKE_CURRENT_BINARY_DIR})
target_link_libraries(View_Equalizer PRIVATE Qt5::Widgets Qt5::PrintSupport)
target_compile_definitions(View_Equalizer PRIVATE VIEW_EQUALIZER_LIBRARY)
我这里是写了一下编译后的事件，可以参考一下
cmake_minimum_required(VERSION 3.5)
project(Demo_View_Equalizer LANGUAGES CXX)
add_subdirectory(./View_Equalizer)
add_subdirectory(./QtHid)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# QtCreator supports the following variables for Android, which are identical to qmake Android variables.
# Check http://doc.qt.io/qt-5/deployment-android.html for more information.
# They need to be set before the find_package(Qt5 ...) call.
#if(ANDROID)
# set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
# if (ANDROID_ABI STREQUAL "armeabi-v7a")
# set(ANDROID_EXTRA_LIBS
# ${CMAKE_CURRENT_SOURCE_DIR}/path/to/libcrypto.so
# ${CMAKE_CURRENT_SOURCE_DIR}/path/to/libssl.so)
# endif()
#endif()
find_package(Qt5 COMPONENTS Widgets REQUIRED)
if(ANDROID)
add_library(Demo_View_Equalizer SHARED
main.cpp
mainwindow.cpp
mainwindow.h
mainwindow.ui
)
else()
add_executable(Demo_View_Equalizer
main.cpp
mainwindow.cpp
mainwindow.h
mainwindow.ui
)
endif()
target_link_libraries(Demo_View_Equalizer PRIVATE Qt5::Widgets)
target_link_libraries(Demo_View_Equalizer PRIVATE View_Equalizer)
# 假设View_Equalizer模块的可执行文件或库在构建后将位于对应的Debug或Release目录下
# 并且想在Demo_View_Equalizer模块构建完成后将其复制到对应的Demo_View_Equalizer的Debug或Release目录
# 获取当前构建类型，默认为Debug，如果未设置CMAKE_BUILD_TYPE
if(NOT DEFINED CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Debug)
endif()
# 根据构建类型设置A模块的输出目录路径
set(A_OUTPUT_DIR "${CMAKE_BINARY_DIR}/${CMAKE_BUILD_TYPE}")
# 假设View_Equalizer模块的输出文件名（需要根据实际情况替换）
set(B_OUTPUT_NAME "View_Equalizer.dll") # 假设的输出文件名
# 设置View_Equalizer模块的输出文件路径
set(B_OUTPUT_FILE "${CMAKE_BINARY_DIR}/View_Equalizer/${CMAKE_BUILD_TYPE}/${B_OUTPUT_NAME}")
# 目标文件在Demo_View_Equalizer模块的输出目录下的路径
set(B_OUTPUT_DESTINATION "${A_OUTPUT_DIR}/${B_OUTPUT_NAME}")
message(STATUS "B_OUTPUT_FILE : ${B_OUTPUT_FILE}")
message(STATUS "B_OUTPUT_DESTINATION : ${B_OUTPUT_DESTINATION}")
message(STATUS "command : ${CMAKE_COMMAND} -E copy ${B_OUTPUT_FILE} ${B_OUTPUT_DESTINATION}")
# 添加一个自定义目标，以确保复制操作被执行
add_custom_target(AllBuild ALL
DEPENDS ${B_OUTPUT_DESTINATION}
)
# 添加一个自定义命令来执行复制操作
add_custom_command(
OUTPUT ${B_OUTPUT_DESTINATION}
COMMAND ${CMAKE_COMMAND} -E copy ${B_OUTPUT_FILE} ${B_OUTPUT_DESTINATION}
DEPENDS ${B_OUTPUT_FILE}
COMMENT "Copying View_Equalizer output to Demo_View_Equalizer/${CMAKE_BUILD_TYPE} directory"
VERBATIM
)
# 确保我们的自定义目标在Demo_View_Equalizer之后构建
add_dependencies(AllBuild Demo_View_Equalizer)