Debugging QML with Qt creator

Question

I have a Qt (5.8.0) project using QML files. I would like to set breakpoints in the QML file using Qt creator (4.2.1) so I can follow the flow. However I cannot get it to work. I have enabled "Enable QML debugging and profiling" in the qmake build step and "Enable C++" and "Enable QML" in the run step.

The breakpoints in the C++ code are hit, but the QML are ignored. When starting I get the following message:

QDeclarativeDebugServer: Ignoring 
\"-qmljsdebugger=port:42715,block,services:DebugMessages,QmlDebugger,V8Debugger,QmlInspector\". 
Debugging has not been enabled.

When I try to debug QML files in demo projects like "Calendar" with the same kit it does work and breakpoints are hit.

Any ideas?

Answer 1

Did you enable the QML Debugger in your code? I remember putting something like this into my code:

For Qt4:

#include <QtDeclarative/qdeclarativedebug.h>
QDeclarativeDebuggingEnabler qmldbg;

or in case of Qt5:

#include <QQmlDebuggingEnabler>
QQmlDebuggingEnabler enabler;

Also QML debugging needs to be activated in the Execution Settings:

Answer 2

I had to remove a package from my .pro file:

#CONFIG += qtquickcompiler

With this line commented out and confirming my project's build steps: "Enable QML debugging and profiling" was checked, the breakpoints worked.