CMake + Qt6: Unable to Find <QNetworkAccessManager> header

[IPlayGenji6]

I'm encountering an unusual issue with a CMake + Qt6 project. In my CMakeLists.txt, I have configured Qt6 Network like this:

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS
    Core
    Gui
    Widgets
    SerialPort
    PrintSupport
    Network
    OpenGL
    OpenGLWidgets
    LinguistTools
)

set(SRC
    main.cpp
    controller/controller.cpp
    controller/product.cpp
    controller/serialportmanager.cpp
    core/eventhub.cpp
    core/observer.cpp
    views/configview.cpp
    views/dataview.cpp
    views/firmwareupgradeview.cpp
    views/mainwindow.cpp
    views/viewbasewidget.cpp
    views/serialportview.cpp

    global.h
    controller/controller.h
    controller/product.h
    controller/serialportmanager.h
    core/eventhub.h
    core/observer.h
    views/configview.h
    views/dataview.h
    views/firmwareupgradeview.h
    views/mainwindow.h
    views/viewbasewidget.h
    views/serialportview.h

    views/configview.ui
    views/dataview.ui
    views/firmwareupgradeview.ui
    views/mainwindow.ui
    views/serialportview.ui
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(${CMAKE_PROJECT_NAME}
        MANUAL_FINALIZATION
        "${SRC}"
        "${CMAKE_SOURCE_DIR}/resource/res.qrc"
        views/tempins.h views/tempins.cpp views/tempins.ui
    )
endif()

target_link_libraries(${CMAKE_PROJECT_NAME} PRIVATE
    Qt${QT_VERSION_MAJOR}::Core
    Qt${QT_VERSION_MAJOR}::Widgets
    Qt${QT_VERSION_MAJOR}::Gui
    Qt${QT_VERSION_MAJOR}::SerialPort
    Qt${QT_VERSION_MAJOR}::PrintSupport
    Qt${QT_VERSION_MAJOR}::Network
    Qt${QT_VERSION_MAJOR}::OpenGL
    Qt${QT_VERSION_MAJOR}::OpenGLWidgets
    widgets
)

I tried #include <QNetworkAccessManager> in controller.cpp, but it fails to find the header file. However, when I include it in other source files, like firmwareupgradeview.cpp, it works fine, I only know controller.cpp is having this issue. I've already tried cleaning and rebuilding the project, as well as checking the include paths, but nothing has resolved the problem.

[Pl45m4]

@IPlayGenji6 said in CMake + Qt6: Unable to Find <QNetworkAccessManager> header:

only controller.cpp is having this issue

Try product.cpp as well, if this also doesn't work, it's most likely because of your directory structure.
Is controller/ in your include path?

[IPlayGenji6]

@Pl45m4
I tried, it didn't work. this is my directory structure:

D:\QT-PROJECTS\PROJECT1\SRC
│  CMakeLists.txt
│  global.h
│  main.cpp
│
├─controller
│      controller.cpp
│      controller.h
│      product.cpp
│      product.h
│      serialportmanager.cpp
│      serialportmanager.h
│      turntable.cpp
│      turntable.h
│
├─core
│      eventhub.cpp
│      eventhub.h
│      observer.cpp
│      observer.h
│
├─views
│      calibrationview.cpp
│      calibrationview.h
│      calibrationview.ui
│      configview.cpp
│      configview.h
│      configview.ui
│      dataview.cpp
│      dataview.h
│      dataview.ui
│      firmwareupgradeview.cpp
│      firmwareupgradeview.h
│      firmwareupgradeview.ui
│      mainwindow.cpp
│      mainwindow.h
│      mainwindow.ui
│      serialportview.cpp
│      serialportview.h
│      serialportview.ui
│      tempins.cpp
│      tempins.h
│      tempins.ui
│      turntableview.cpp
│      turntableview.h
│      turntableview.ui
│      viewbasewidget.cpp
│      viewbasewidget.h
│      viewbasewidget.ui

and cmake

set(INC
    "${CMAKE_CURRENT_SOURCE_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}/controller"
    "${CMAKE_CURRENT_SOURCE_DIR}/core"
    "${CMAKE_CURRENT_SOURCE_DIR}/views"
)

target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
    "${CMAKE_SOURCE_DIR}/include"
    "${INC}"
)

[IPlayGenji6]

@Pl45m4
I used #include <QtNetwork/QNetworkAccessManager> in controller.cpp and resolved the issue, but I didn't need to add the path QtNetwork/ in firmwareupgradeview.cpp. why that is?

[JonB]

@IPlayGenji6
Have a look carefully at the actual compiler statements generated for these two source files during build. So far as I know include paths are not passed by setting environment variables so you should see a difference in the -I... options, else it would be inexplicable/something deeper.

This assumes " it fails to find the header file" is an actual error generated during compilation? If it's only while editing inside Creator then it's from the Code Model only, and that sometimes gets stuff wrong for unknown reasons.