How to use QML caching?

[Ibrahim]

Hi; I have heard QML caching. I wonder, is this available on Qt Community Edition? I wrote these into .pro file:

QT += quick
CONFIG += c++11 qmlcache

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += main.cpp

RESOURCES += qml.qrc

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

TARGETPATH = MyCompany/Test
QML_FILES = main.qml Page1.qml Page1Form.ui.qml qmldir
load(qml_plugin)

But I get this error:

Project ERROR: Project has no top-level .qmake.conf file.
Error while parsing file /home/username/QtApp/QtApp.pro. Giving up.
Project ERROR: Must set TARGETPATH (QML import name)
Error while parsing file /home/username/QtApp/QtApp.pro. Giving up.
Project ERROR: Project has no top-level .qmake.conf file.
Error while parsing file /home/username/QtApp/QtApp.pro. Giving up.
Project ERROR: Project has no top-level .qmake.conf file.
Error while parsing file /home/username/QtApp/QtApp.pro. Giving up.

How can I use QML caching? Thanks.

[jpnurmi]

You cannot load qml_plugin (nor qml_module) to an application project.

http://doc.qt.io/qt-5/qtquick-deployment.html#limitations

Currently this feature has some limitations:

• Only QML and JavaScript documents that are part of a QML module can be compiled ahead of time.

You need to split the components you want to be cached out of the main app to a separate QML plugin or module. If you create a QML plugin (QQmlExtensionPlugin), load qml_plugin. If you create a QML module without a C++ plugin (.qmldir + .qml/.js only), load qml_module.