Qt5.7/C++ - Playing with 'auto' keyword and chrono - loop problem?

[jimbo]

Hello,

I've found a way to turn off optimisation for a function.
This seems to work, the time output shows.

#pragma GCC push_options
#pragma GCC optimize ("O0") //capital 0 - zero
void MainWindow::f4(int n, int arr[], int size) {
    int k;
    for (int j = 0; j < n; j++)
    {
        for (int i = 0; i <= size - 1; i++)
        {
            k = arr[i];    //ok
            //qDebug() << k << i << j;
        }
    }
}
#pragma GCC pop_options

#pragma GCC push_options
#pragma GCC optimize ("O0") //capital 0 - zero
void MainWindow::f4(int n, int arr[], int size) {
    int k;
    for (int j = 0; j < n; j++)
    {
        for (int i = 0; i <= size - 1; i++)
        {
            k = arr[i];    //ok
            //qDebug() << k << i << j;
        }
    }
}
#pragma GCC pop_options

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Regards