error : when control gpio on raspberry pi

Son DongSeong

I have a raspberry pi (CM4)
I followed the instructions in the following link to set up on both Raspberry pi and Ubuntu (host pc)
link : https://github.com/MuyePan/CrossCompileQtForRpi

When I created a program called 'helloworld' for Raspberry Pi on my host PC and ran it, it executed successfully.

I want to control gpios on raspberry pi.
so I downloaded wiringPi library and installed it.
link : https://github.com/WiringPi/WiringPi

After I installed it,
there is the library file, libwiringPi.so in /usr/lib on raspberry pi and in ~/rpi-sysroot/usr/lib on host pc
and there is the header file, wiringPi.h in /usr/include on raspberry pi and in ~/rpi-sysroot/usr/include on host pc

I modified the CMakeLists.txt file in Qt Creator as follows.

-------------------------------------------------------------------
cmake_minimum_required(VERSION 3.5)

project(TestGpio VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)

set(PROJECT_SOURCES
    main.cpp
    mainwindow.cpp
    mainwindow.h
    mainwindow.ui
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(TestGpio
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )

# Define target properties for Android with Qt 6 as:
#    set_property(TARGET TestGpio APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
    if(ANDROID)
        add_library(TestGpio SHARED
            ${PROJECT_SOURCES}
        )
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
    else()
        add_executable(TestGpio
            ${PROJECT_SOURCES}
        )
    endif()
endif()

find_library(WIRINGPI_LIB NAMES wiringPi PATHS /usr/lib)

target_link_libraries(TestGpio PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${WIRINGPI_LIB})

# Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1.
# If you are developing for iOS or macOS you should consider setting an
# explicit, fixed bundle identifier manually though.
if(${QT_VERSION} VERSION_LESS 6.1.0)
    set(BUNDLE_ID_OPTION MACOSX_BUNDLE_GUI_IDENTIFIER com.example.TestGpio)
endif()
set_target_properties(TestGpio PROPERTIES
    ${BUNDLE_ID_OPTION}
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

include(GNUInstallDirs)
install(TARGETS TestGpio
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

if(QT_VERSION_MAJOR EQUAL 6)
    qt_finalize_executable(TestGpio)
endif()
-------------------------------------------------------------------

I changed find_library and target_link_libraries as described above.
When I ran the program, the following error occured.

18:30:56: Running steps for project TestGpio...
18:30:56: Starting: "/home/son/Qt/Tools/CMake/bin/cmake" --build /home/son/Documents/TestGpio/build/RPI-Debug --target all install
[0/1 ?/sec] Re-running CMake...
-- Configuring done (0.1s)
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
WIRINGPI_LIB
    linked by target "TestGpio" in directory /home/son/Documents/TestGpio

-- Generating done (0.0s)
CMake Generate step failed.  Build files cannot be regenerated correctly.
FAILED: build.ninja 
/home/son/Qt/Tools/CMake/bin/cmake --regenerate-during-build -S/home/son/Documents/TestGpio -B/home/son/Documents/TestGpio/build/RPI- Debug
ninja: error: rebuilding 'build.ninja': subcommand failed
18:30:56: The process "/home/son/Qt/Tools/CMake/bin/cmake" exited with code 1.
Error while building/deploying project TestGpio (kit: RPI)
When executing step "Build"
18:30:56: Elapsed time: 00:00.

I would appreciate it if you could tell me what the problem is and how I should modify the CMakeLists.txt file.