[QTBUG-101306] enum-enum warning in qxcbwindow.cpp is genuiune - Qt Bug Tracker

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Details

Type: Bug
Status: Closed
Priority: P2: Important
Resolution: Done
Affects Version/s: 6.3.0 Beta2
Fix Version/s: 5.15.9, 6.2.5, 6.3.0 Beta3, 6.4.0 Beta1
Component/s: QPA: X11/XCB
Labels:
None

Commits:
cfc2e267a4 (qt/qtbase/dev) cfc2e267a4 (qt/tqtc-qtbase/dev) 42c242f5fc (qt/qtbase/6.2) 42c242f5fc (qt/tqtc-qtbase/6.2) dd974c68ee (qt/qtbase/6.3) dd974c68ee (qt/tqtc-qtbase/6.3) de28284547 (qt/tqtc-qtbase/5.15) dd974c68ee (qt/tqtc-qtbase/6.3.0)

Description

C++20 deprecated arithmetic between enums. QFlags<> overrides that with its operators, but not for enums of different types.

This leads to a deprecation warning in qxcbwindow.cpp:

src/plugins/platforms/xcb/qxcbwindow.cpp:1597:53: warning: bitwise operation between different enumeration types ('Qt::WindowType' and 'QNativeInterface::Private::QXcbWindow::WindowType') is deprecated [-Wdeprecated-enum-enum-conversion]
    if ((flags & Qt::FramelessWindowHint) && !(type & WindowType::KdeOverride)) {
                                               ~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~

This appears to be a genuine bug, because 0x4000 (QXcbWindow::WindowType::KdeOverride) is WindowMinimizeButtonHint in decltype(type) = Qt::WindowType.

Unfortunately, it's not obvious to me how to fix it.