You ask, more than ever people cross-compilation Qt5.15 version?
My arm compiler - Linux - gnueabihf - g + + 4.9, the compiled version 5.5, 5, 10 were compiled,
But want to build something wrong with 5.15

The from/home/uu/temp/qt - everywhere - SRC - 5.15.2/qtbase/qmake/main CPP: 30:
/home/uu/temp/qt - everywhere - SRC - 5.15.2/qtbase/include/QtCore/../../SRC/corelib/kernel/qmetatype. H: In instantiation of 'QtMetaTypePrivate: : QSequentialIterableImpl: : QSequentialIterableImpl (const T *) [with T=QList< QVariant>] ':
/home/uu/temp/qt - everywhere - SRC - 5.15.2/qtbase/include/QtCore/../../SRC/corelib/kernel/qvariant. H: 772-139: the required from here
/home/uu/temp/qt - everywhere - SRC - 5.15.2/qtbase/include/QtCore/../../SRC/corelib/kernel/qmetatype. H: 1160:135: error: ambiguous class template instantiation for 'struct QtMetaTypePrivate: : ContainerCapabilitiesImpl Void> '
, _iteratorCapabilities (ContainerAPI : : IteratorCapabilities | (1 & lt; <4) | (ContainerCapabilitiesImpl : : ContainerCapabilities & lt; <(4 + 3)))
One executive configure this error
Don't know if bosses have cross compiled more than 5.15?