Master head compile error - The process "C:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2

Hi
I keep getting compile error when trying to compile master head in windows 64bit .

The process “C:\Qt\Tools\QtCreator\bin\jom.exe” exited with code 2.
Error while building/deploying project qgroundcontrol (kit: Desktop Qt 5.12.6 MSVC2017 64bit)
When executing step "Make"

Stable_V4.0 compiles just fine
Any one else getting this ?
Any idea what can be the problem?

tail of compile log below

Qt\5.12.6\msvc2017_64\include\QtTest -IC:\Qt\5.12.6\msvc2017_64\include\QtCore -Imoc -I/include -IC:\Qt\5.12.6\msvc2017_64\mkspecs\win32-msvc -Foobj\ @C:\Users\ROIEGE~1\AppData\Local\Temp\RCToParamDialogController.obj.14848.49578.jom
RCToParamDialogController.cc
Generating Code…
Generating Code…
QGCImageProvider.cc
Generating Code…
Generating Code…
ScreenToolsController.cc
QmlObjectListModel.cc
Generating Code…
Generating Code…
16:19:39: The process “C:\Qt\Tools\QtCreator\bin\jom.exe” exited with code 2.
Error while building/deploying project qgroundcontrol (kit: Desktop Qt 5.12.6 MSVC2017 64bit)
When executing step “Make”

Found the problem
Warnings in the following files:
\src\MissionManager\SimpleMissionItem.cc
\src\VideoManager\VideoManager.cc

By default “warning as error” flag is set
Done some tweaking in the files till it will be officially resolved in master