We're using 5.15.2. Had same problems with 5.12.3.

@Kofr We have on AMD Ryzen 7 with 8 Cores (16 Hyperthreads) at work and the compilation speed is impressive. We use the system to build Yocto Linux images.

Hi to all
As of Qt 5.11 there is a static function in QSysInfo class:
QByteArray QSysInfo::machineUniqueId()
https://doc.qt.io/qt-5/qsysinfo.html#machineUniqueId