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
{
    updateNetworkState();
}
void BitcoinGUI::setNetworkActive(bool networkActive)
{
    updateNetworkState();
}
void BitcoinGUI::updateHeadersSyncProgressLabel()
{
    int64_t headersTipTime = clientModel->getHeaderTipTime();
    int headersTipHeight = clientModel->getHeaderTipHeight();
    int estHeadersLeft = (GetTime() - headersTipTime) / Params().GetConsensus().nPowTargetSpacing;
    if (estHeadersLeft > HEADER_HEIGHT_DELTA_SYNC)
        progressBarLabel->setText(tr("Syncing Headers (%1%)...").arg(QString::number(100.0 / (headersTipHeight+estHeadersLeft)*headersTipHeight, 'f', 1)));
}
void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header)
{
    if (modalOverlay)
    {
        if (header)
            modalOverlay->setKnownBestHeight(count, blockDate);
        else
            modalOverlay->tipUpdate(count, blockDate, nVerificationProgress);
    }
    if (!clientModel)
        return;
    
    statusBar()->clearMessage();
    
    enum BlockSource blockSource = clientModel->getBlockSource();