Trying to compile lyx2.4 with g++-12, QT6, cmake

[Scott Kostyshak]

On Sat, Sep 17, 2022 at 01:17:30PM +0200, Kornel Benko wrote:
> 
> I got this error:
> /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.h:123:22: error: ‘virtual bool
> lyx::frontend::GuiApplication::nativeEventFilter(const QByteArray&, void*, long int*)’
> marked ‘override’, but does not override 123 |         virtual bool
> nativeEventFilter(const QByteArray & eventType, void * message, |
> ^~~~~~~~~~~~~~~~~
> 
> 
> Removing the 'override' follows the next error:
> /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.cpp: In function
> ‘lyx::frontend::Application* lyx::createApplication(int&, char**)’:
> /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.cpp:231:84: error: invalid
> new-expression of abstract class type ‘lyx::frontend::GuiApplication’ 231 |
> frontend::GuiApplication * guiApp = new frontend::GuiApplication(argc, argv); |
>                                                                          ^ In file
> included from /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.cpp:15:
> /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.h:55:7: note:   because the
> following virtual functions are pure within ‘lyx::frontend::GuiApplication’: 55 | class
> GuiApplication : public QApplication, public Application |       ^~~~~~~~~~~~~~ In file
> included from /usr/include/x86_64-linux-gnu/qt6/QtCore/QAbstractNativeEventFilter:1, from
> /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.h:24, from
> /usr2/src/lyx/lyx-git/src/frontends/qt/GuiApplication.cpp:15:
> /usr/include/x86_64-linux-gnu/qt6/QtCore/qabstractnativeeventfilter.h:55:18: note:
> ‘virtual bool QAbstractNativeEventFilter::nativeEventFilter(const QByteArray&, void*,
> qintptr*)’ 55 |     virtual bool nativeEventFilter(const QByteArray &eventType, void
> *message, qintptr *result) = 0; |                  ^~~~~~~~~~~~~~~~~
> 
> 
> The error does not show using automake.
> 
> Do we need to set QPA_XCB?

I have no idea. One other question I'm curious about is do we still need
QtCore5Compat? From what I remember that was just supposed to be for the
transition. If we now require something like Qt 6.3 or 6.4 does that
mean we could move away from QtCore5Compat?

Scott
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