QString destructor crash

bkka

I am new to Qt, and immediately I am experiencing the strange issue that simply calling the QString destructor will crash my program. Here is the most minimal example:

#include <iostream>
#include <QString>

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

    std::cout << "before" << std::endl;
    QString* str = new QString("hallo");
    delete str;
    std::cout << "after" << std::endl;

    return 0;
}

The second print statement is never reached. Appearently the issue lies more specifically with the detructor of QArrayDataPointer. The call stack looks like this:

I am using Qt 6.8.2 on Windows.
I'm at a loss here. Is something wrong with my installation? Thanks in advance for your help

Christian Ehrlicher

Don't mix debug and release libraries. You most likely compile your app in debug mode but link against release Qt dlls.

bkka

@Christian-Ehrlicher

Pardon me, but how do I make sure to compile in release? If I set CMAKE_BUILD_TYPE to Release, the issue stays the same

JonB

@bkka
While you await a better answer, I would start by looking at (a) the actual compilation and linker statements executed during the build and (b) the actual DLLs picked up at runtime.

bkka

It turns out I was simply using a different MinGW version than the one Qt was compiled with, for anyone wondering. Anyway, thanks for the replies.