Run `src/qt/bitcoin-qt --disablewallet=1`. 
Quitting after any amount of time will result in `Segmentation fault: 11`

0.14.0 branch at 861cb0c83db0571c2863f6b6276314e115c266ee , osx 10.12.3, Qt5.8
{
    if (nProgress == 0)
    {
        progressDialog = new QProgressDialog(title, "", 0, 100);
        progressDialog->setWindowModality(Qt::ApplicationModal);
        progressDialog->setMinimumDuration(0);
        progressDialog->setCancelButton(0);
        progressDialog->setAutoClose(false);
        progressDialog->setValue(0);
    }
    else if (nProgress == 100)
    {
        if (progressDialog)
        {
            progressDialog->close();
            progressDialog->deleteLater();
        }
    }
    else if (progressDialog)
        progressDialog->setValue(nProgress);
}
void BitcoinGUI::setTrayIconVisible(bool fHideTrayIcon)