Problem with Static Qt

AhmedAlshawi

Hi. I have built a static version of Qt which compiles and runs just fine. However, when I execute a particular function, I get this error message:

QWidget: Must construct a QApplication before a QWidget

This is quite strange because it does not occur when I compile and run the function using the dynamically linked build - only the static. Also, I am pretty sure that I have not made a widget before calling QApplication. I call the QApp right at the start and this error occurs in a function much later on in my code.

Any initial ideas? The only difference between the two is that I add

CONFIG += static

when doing the static build.

Cheers

SGaist

Hi,

Do you have any static QWidget around in your code ?

Christian Ehrlicher

I would run it in the debugger and set a breakpoint on the output. Then simply look at the backtrace to see where it comes from.

AhmedAlshawi

@SGaist
What is a static QWidget?

The error occurs when I run a function that takes some data, produces a chart using qtcharts and using qwt charts then returns a QPixmap.

SGaist

A static variable of the type QWidget.

But as @Christian-Ehrlicher, run your application through the debugger.