Fwd: qt6, autoconf and lyx: help wanted

[Cor Blom]

Hi,

Below the answer on my request for help.

osc build is what I have used throughout and what is used to build the 
packages for openSUSE. Adding qt6-gui-private-devel does solve the error 
and the package now builds fine.

Configure should probably fail if that library is not found.

Thanks,

Cor

-------- Doorgestuurd bericht --------
Onderwerp: Re: qt6, autoconf and lyx: help wanted
Datum: Sat, 26 Aug 2023 13:51:52 +0200
Van: Fabian Vogt <fvogt at suse.de>
Aan: factory at lists.opensuse.org
CC: Cor Blom <cornelisbb at gmail.com>

Moin,

Am Samstag, 26. August 2023, 11:00:58 CEST schrieb Cor Blom:
> Hi all,
> 
> I have a problem compiling lyx against qt6, both locally on my machine 
> and in the buildservice. You can find the project here:
> 
> https://build.opensuse.org/package/show/home:cornelisbb:lyx-unstable/lyx-qt6

I tried to build it locally with the same ./configure and it worked fine,
only in an osc build it failed. My hypothesis was that it somehow relied on
more devel packages implicitly, maybe private headers. I patched 
config/qt.m4
to not delete the test.pro file and the error became obvious:

abuild at fabians-envy:/tmp/tmp.StnZiPAtl6> qmake6 test.pro
Project ERROR: Unknown module(s) in QT: gui-private

This is because of:

qtHaveModule(gui)               {QT += gui gui-private} else {MISSING += 
gui}

Does LyX really need gui-private? If not, just remove the "gui-private" part
here. If it does, use

qtHaveModule(gui-private)       {QT += gui-private} else {MISSING += 
gui-private}

and add BuildRequires: qt6-gui-private-devel

There's another bug FWICT:

[   16s] checking for QtGui/qtgui-config.h... yes
[   16s] checking for QtGui/private/qtgui-config_p.h... no
[   16s] checking whether Qt uses the X Window system... no

but

~> grep -R QT_FEATURE_xcb /usr/include/qt6
/usr/include/qt6/QtGui/qtgui-config.h:#define QT_FEATURE_xcb 1

Cheers,
Fabian

> I have asked the lyx devs for help, but they are baffled. It seems that 
> qt6 on openSUSE behaves unexpected. It works find with cmake, though. 
> (Yes, lyx supports both.)
> 
> In the end I was asked to execute "qmake6 test.pro" (test.pro was a file 
> they provided). It should provide a Makefile, but it did not. Nothing 
> happened.
> 
> Can someone provide some insight here? Are there programs in qt6 in OBS 
> that use autoconf, so that I have something to compare? It seems there 
> is something wrong with autoconf.
> 
> The specific error is that files in the subdirectories of 
> /usr/include/qt6 cannot be found. If I link the files into 
> /usr/include/qt6 itself, they are found. Nothing strange is found in the 
> config phase. Only during compilation. The error message is:
> 
> [   38s]   GEN      moc_Validator.cpp
> [   38s] make  all-am
> [   38s] make[6]: Entering directory 
> '/home/abuild/rpmbuild/BUILD/lyx-qt6-2.4.1692654261.fe74c24da9/src/frontends/qt'
> [   38s]   CXX      ButtonPolicy.o
> [   38s]   CXX      Dialog.o
> [   38s]   CXX      DialogFactory.o
> [   38s]   CXX      Action.o
> [   38s] In file included from FindAndReplace.h:15,
> [   38s]                  from DialogFactory.cpp:14:
> [   38s] DockView.h:17:10: fatal error: QDockWidget: No such file or 
> directory
> [   38s]    17 | #include <QDockWidget>
> [   38s]       |          ^~~~~~~~~~~~~
> [   38s] In file included from Dialog.cpp:15:
> [   38s] GuiView.h:22:10: fatal error: QMainWindow: No such file or 
> directory
> [   38s]    22 | #include <QMainWindow>
> [   38s]       |          ^~~~~~~~~~~~~
> [   38s] compilation terminated.
> 
> Any help would be much appreciated.
> 
> Thanks,
> 
> Cor
>