[Interest] QDateTime::toString() fails when used in exit handler

[Bernhard Lindner]

Hi!

I tried to log `std::exit` calls in my GCC10 compiled Qt 5.14.2 application 
under KDE Neon
18.04. This fails when turning a `QDateTime` object into a string. It can be 
reproduced
with the following snippet:

    void exitHandler() noexcept
    {
       QString b = QDateTime::currentDateTime().toString();
    }
    
    int main(int pArgc, char* pArgv[]) noexcept
    {
       std::atexit(&exitHandler);
       QString a = QDateTime::currentDateTime().toString();
       std::exit(1);
    
       return 0;
    }

Variable `a` contains the expected date/time while variable `b` is empty. When 
using UTC
time, `b` is " GMT". I am not aware of any related restrictions of 
exit-handlers.

Can someone tell me what is going wrong here?

-- 
Best Regards,
Bernhard Lindner

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