Gqrx crashes when built with Qt6, e.g. when selecting demodulator:
0 memcpy () at /usr/src/lib/libc/amd64/string/memmove.S:306
1 0x000000080140edd9 in ?? () from /usr/local/lib/qt6/libQt6Gui.so.6
2 0x0000000801416193 in QRasterPaintEngine::drawImage(QPointF const&, QImage const&) () from /usr/local/lib/qt6/libQt6Gui.so.6
3 0x00000000003569ba in ?? ()
4 0x0000000800b3c555 in QWidget::event(QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
5 0x0000000800bcf37b in QFrame::event(QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
6 0x0000000800ae943a in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
7 0x0000000800aea526 in QApplication::notify(QObject*, QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
8 0x0000000801cd3d43 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/local/lib/qt6/libQt6Core.so.6
9 0x0000000800b2d681 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
10 0x0000000800b4d3ae in QWidgetRepaintManager::paintAndFlush() () from /usr/local/lib/qt6/libQt6Widgets.so.6
11 0x0000000800b4d820 in QWidgetRepaintManager::sync() () from /usr/local/lib/qt6/libQt6Widgets.so.6
12 0x0000000800b3c784 in QWidget::event(QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
13 0x0000000800c76a69 in QMainWindow::event(QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
14 0x0000000800ae943a in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
15 0x0000000800aea526 in QApplication::notify(QObject*, QEvent*) () from /usr/local/lib/qt6/libQt6Widgets.so.6
16 0x0000000801cd3d43 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/local/lib/qt6/libQt6Core.so.6
17 0x0000000801cd4e16 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/local/lib/qt6/libQt6Core.so.6
18 0x0000000801f47578 in ?? () from /usr/local/lib/qt6/libQt6Core.so.6
19 0x00000008034a7034 in g_main_context_dispatch () from /usr/local/lib/libglib-2.0.so.0
20 0x00000008034a7373 in ?? () from /usr/local/lib/libglib-2.0.so.0
21 0x00000008034a7418 in g_main_context_iteration () from /usr/local/lib/libglib-2.0.so.0
22 0x0000000801f46f89 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/local/lib/qt6/libQt6Core.so.6
23 0x0000000801cdd407 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/local/lib/qt6/libQt6Core.so.6
24 0x0000000801cd4491 in QCoreApplication::exec() () from /usr/local/lib/qt6/libQt6Core.so.6
This patch avoids Qt6 detection. We will switch to Qt6 later, following
comms/gnuradio dependency (that still depends on Qt5).
PR: 272543
Reported by: trasz
ef05a49890