cmake Qt5 failes with "module QtQuick is not installed'

Question

I have tried a simple Qt Qml example and I am not able to build it. I already googled and found a dozen similar problems, but none of the recommendations helped me. My code looks like this:

main.cpp

#include <QtGui/QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char* argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine(QUrl("qrc:main.qml"));
    if (engine.rootObjects().isEmpty())
        return -1;
    return app.exec();
}

main.qml

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow
{
    visible: true
    width: 640
    height: 480
    title: qsTr("Minimal Qml")
}

qml.qrc

<RCC>
    <qresource prefix="/">
        <file>main.qml</file>
    </qresource>
</RCC>

and my CMakeLists.txt

find_package(Qt5 COMPONENTS Widgets Qml Quick REQUIRED)

qt5_add_resources(QT_RESOURCES qml.qrc)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)
set(PROJECT "qmltest")
project(${PROJECT})

add_executable(${PROJECT} main.cpp  ${QT_RESOURCES})

target_link_libraries(${PROJECT}
    Qt5::WinMain
    Qt5::Core
    Qt5::Qml
    Qt5::Quick
)

I used windeployqt to get all librarys into the right place. The programm starts on my Windows machine but the console output ends with:

QQmlApplicationEngine failed to load component
qrc:main.qml:2:1: module "QtQuick.Controls" is not installed
qrc:main.qml:1:1: module "QtQuick" is not installed
qrc:main.qml:2:1: module "QtQuick.Controls" is not installed
qrc:main.qml:1:1: module "QtQuick" is not installed

Path to the app after deploying it:

<DIR>   bearer
            qgenericbearerd.dll
<DIR>   iconengines
            qsvgicond.dll
<DIR>   imageformats
            qgifd.dll
            qicnsd.dll
            qicod.dll
            qjpegd.dll
            qsvgd.dll
            qtgad.dll
            qtiffd.dll
            qwbmpd.dll
            qwebpd.dll
<DIR>   platforminputcontexts
            qtvirtualkeyboardplugind.dll
<DIR>   platforms
            qwindowsd.dll
<DIR>   qmltooling
            qmldbg_debuggerd.dll
            qmldbg_inspectord.dll
            qmldbg_locald.dll
            qmldbg_messagesd.dll
            qmldbg_natived.dll
            qmldbg_nativedebuggerd.dll
            qmldbg_previewd.dll
            qmldbg_profilerd.dll
            qmldbg_quickprofilerd.dll
            qmldbg_serverd.dll
            qmldbg_tcpd.dll
<DIR>   scenegraph
            qsgd3d12backendd.dll
<DIR>   styles
            qwindowsvistastyled.dll
<DIR>   translations
            ...
<DIR>   virtualkeyboard
            qtvirtualkeyboard_hanguld.dll
            qtvirtualkeyboard_openwnnd.dll
            qtvirtualkeyboard_pinyind.dll
            qtvirtualkeyboard_tcimed.dll
            qtvirtualkeyboard_thaid.dll
        concrt140d.dll
        d3dcompiler_47.dll
        libEGLd.dll
        libGLESv2d.dll
        msvcp140d.dll
        msvcp140d_atomic_wait.dll
        msvcp140d_codecvt_ids.dll
        msvcp140_1d.dll
        msvcp140_2d.dll
        qmltest.exe
        qmltest.ilk
        qmltest.pdb
        Qt5Cored.dll
        Qt5Guid.dll
        Qt5Networkd.dll
        Qt5Qmld.dll
        Qt5Quickd.dll
        Qt5Svgd.dll
        Qt5Widgetsd.dll
        vccorlib140d.dll
        vcruntime140d.dll

I'm using Qt 5.15 open source. I built it and installed it on WIndows7. Any ideas? Thank you!

Answer 1

For one of our Windows app, we deploy over 1700 files. The directory structure looks roughly like this:

<DIR> MyQtApp_Bin_Dir
          MyQtApp.exe
          COPY C:\Qt\Qt5.15.6\5.15.6\msvc2019_64\bin\*.dll
          COPY C:\Qt\Qt5.15.6\5.15.6\msvc2019_64\resources\*.*
          COPY C:\Qt\Qt5.15.6\5.15.6\msvc2019_64\plugins\*
          COPY VISUALSTUDIO_REDISTRIBUTABLES_HERE

<DIR> MyQtApp_Bin_Dir\qml
          COPY C:\Qt\Qt5.15.6\5.15.6\msvc2019_64\qml\*

In the directory dump that you posted, the qml folder appears to be absent. The content directly controls the import statements that you are having issue with.