[LyX/master] Allow compiling with Qt6

[Yu Jin]

Am Di., 16. März 2021 um 22:30 Uhr schrieb Yu Jin <yu_jin at lyx.org>:

> Am Di., 16. März 2021 um 19:04 Uhr schrieb Kornel Benko <kornel at lyx.org>:
>
>> Am Tue, 16 Mar 2021 18:21:19 +0100
>> schrieb Yu Jin <yu_jin at lyx.org>:
>>
>> > Am Di., 16. März 2021 um 16:36 Uhr schrieb Kornel Benko <kornel at lyx.org
>> >:
>> >
>> > > Am Tue, 16 Mar 2021 16:32:49 +0100
>> > > schrieb Yu Jin <yu_jin at lyx.org>:
>> > >
>> > > > Just seen this one and wanted to try it out obviously :)
>> > > > But it doesn't work for me on Windows. Using CMake GUI I notice
>> that the
>> > > > dropdown menu LYX_USE_QT does not contain QT6, just QT5, QT4 and
>> AUTO as
>> > > > before. When I choose AUTO it fails with:
>> > > >
>> > > > CMake Error at development/cmake/modules/FindQt4.cmake:568
>> (message):
>> > > >   Could NOT find QtCore.  Check
>> > > >   C:/lyx/masterbuild64Qt6/CMakeFiles/CMakeError.log for more
>> details.
>> > > > Call Stack (most recent call first):
>> > > >   CMakeLists.txt:804 (find_package)
>> > > >
>> > > > It does find some QT6 stuff correctly though, like QT_PLUGINS_DIR,
>> but
>> > > not
>> > > > everything, like QtCore.
>> > >
>> > > I have a patch ready, but cannot test.
>> > >
>> >
>> > Care to share it? I can test.
>>
>> Attached.
>>
>
> Still seems to be missing something. When I try to configure the same way
> as with Qt5 (navigate to the Qt dir at CMAKE_PREFIX_PATH), it fails with
> this error:
>
> CMake Error at CMakeLists.txt:786 (find_package):
>   Could not find a package configuration file provided by "Qt6Core" with
> any
>   of the following names:
>
>     Qt6CoreConfig.cmake
>     qt6core-config.cmake
>
>   Add the installation prefix of "Qt6Core" to CMAKE_PREFIX_PATH or set
>   "Qt6Core_DIR" to a directory containing one of the above files.  If
>   "Qt6Core" provides a separate development package or SDK, be sure it has
>   been installed.
>
> Then I choose Qt6Core_DIR manually and then it fails again with basically
> the same error but this time it's Qt6CoreToolsConfig.cmake. Also setting
> that one manually fails with Qt6WidgetsConfig.cmake, (did not try past that
> one).
>
> Oh wait, that was my fault, chosen wrong folder .... now it configures ok,
will try to compile..
-- 
    Eugene
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