Insecure random generation in cryptographic code

static QByteArray _q_PKCS12_salt()
{
    QByteArray salt;
    salt.resize(8);
    for (int i = 0; i < salt.size(); ++i)
        salt[i] = (qrand() & 0xff);
    return salt;
}

static QByteArray _q_PKCS12_salt()
{
    // Note that QRandomGenerator::system() is usually cryptographically safe.
    const quint64 salt = QRandomGenerator::system()->generate64();
    return QByteArray{reinterpret_cast<const char*>(&salt), sizeof(salt)};
}