virtualDestructor
ftp://ftp.de.debian.org/debian/pool/main/q/qt6-charts/qt6-charts_6.8.2.orig.tar.xz
head qtcharts-everywhere-src-6.8.2/src/chartsqml2/declarativexyseries_p.h:27:6: warning:inconclusive: Class 'DeclarativeXySeries' which has virtual members does not have a virtual destructor. [virtualDestructor]