There is an ABI break in Qt 5.10 pre-alpha. It's caused by this commit: 4de40514066e7e31fe02c87afaf0863d6928391f
Here's a fix for it: https://codereview.qt-project.org/#/c/202511/
However, the ultimate question is why it wasn't caught in the BIC tests...
|For Gerrit Dashboard: QTBUG-62516|
|202511,3||Fix an ABI break caused by too-aggressive deprecation||dev||qt/qtbase||Status: MERGED||+2||0|