[Interest] QApplication was not created in the main() thread.

[Thiago Macieira]

On Saturday, 1 July 2023 06:37:20 PDT Yauheni Pervenenka via Interest wrote:
> Hi, Konstantin, thanks for your reply, I have attached stack when QObject
> created first time, the problem is that UB is already exists in Qt,

No, it doesn't.

> Q_CONSTRUCTOR_FUNCTION(initialize) and QBasicAtomicPointer<QThread>
> QCoreApplicationPrivate::theMainThread =
> Q_BASIC_ATOMIC_INITIALIZER(nullptr);
> should be called in next order, first should be initialized theMainThread
> and after should be called Q_CONSTRUCTOR_FUNCTION(initialize) but it is not
> guaranteed by standard, https://en.cppreference.com/w/cpp/language/siof

Nope. The QBasicAtomicPointer is initialised at static time, meaning it is 
initialised *before* any code runs. It's guaranteed by the standard.

Your diagnosis is incorrect.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Cloud Software Architect - Intel DCAI Cloud Engineering
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