[Interest] Need help to configure qt6 under Windows 10

[Kai Köhne]

Hi Liang,

Searching for ‘CMake error’ shows up

Configuring 'qtgraphicaleffects'
CMake Error at qtbase/cmake/QtPluginHelpers.cmake:69 (add_library):
  add_library cannot create target "qtgraphicaleffectsplugin" because another
   target with the same name already exists.  The existing target is a module
   library created in source directory
   "E:/qt5/qt5compat/src/imports/graphicaleffects5".  See documentation for
   policy CMP0002 for more details.
Call Stack (most recent call first):
  E:/qt6-build/qtbase/lib/cmake/Qt6Qml/Qt6QmlBuildInternals.cmake:81 (qt_internal_add_plugin)
   qtgraphicaleffects/src/effects/CMakeLists.txt:7 (qt_internal_add_qml_module)

qgraphicaleffects is not part of qt 6 (see also https://doc-snapshots.qt.io/qt6-dev/whatsnew60.html#removed-modules-in-qt-6-0 ). I assume you’ve been cloning from git? Please make sure to only clone submodules that are part of the respective release. This is easiest done by  a) Cloning qt5.git b) checking out the right branch/tag , and c) only then running perl init-repository.

Regards

Kai



Von: Liang Jian <jianliang79 at gmail.com>
Gesendet: Mittwoch, 3. März 2021 11:17
An: Kai Köhne <Kai.Koehne at qt.io>
Cc: Macieira, Thiago <thiago.macieira at intel.com>; Interest <interest at qt-project.org>
Betreff: Re: [Interest] Need help to configure qt6 under Windows 10

    Hi Kai, I have attached the configure log which is generated with the following command:

..\qt5\configure.bat -prefix ..\qt6-win64 -developer-build -opengl desktop -D QT_NO_BUILD_TESTS=ON -D QT_NO_MAKE_EXAMPLES=ON -skip qt3d -skip qtwebengine > configure.log 2>&1

    I hope that will help you to find the issue, thanks.

On Wed, Mar 3, 2021 at 5:38 PM Kai Köhne <Kai.Koehne at qt.io<mailto:Kai.Koehne at qt.io>> wrote:


> Von: Interest <interest-bounces at qt-project.org<mailto:interest-bounces at qt-project.org>> Im Auftrag von Liang Jian
> Gesendet: Mittwoch, 3. März 2021 09:43
> An: Macieira, Thiago <thiago.macieira at intel.com<mailto:thiago.macieira at intel.com>>
> Cc: Interest <interest at qt-project.org<mailto:interest at qt-project.org>>
> Betreff: Re: [Interest] Need help to configure qt6 under Windows 10
>
>    Thank you for the suggestion. Since all the documentations I have read so far tell me to build qt6 with configure first, such
> as https://wiki.qt.io/Building_Qt_6_from_Git , I have no idea how to configure and build qt6 using CMake directly since qt
> build  system is so complex. Do you know is there any documentation on the web to teach one how to configure and build qt6 > with  CMake directly? Thanks.

I think this is a red herring. configure (which has a nicer command line, and therefore still is the officially recommended way, see https://doc.qt.io/qt-5/configure-options.html) just calls cmake, and the used cmake arguments are printed on the very first line.

Can you paste the full output of the configure tool? You can redirect the output to a file:

  ..\qt5\configure.bat -prefix ..\qt6-win64 -developer-build -opengl >configure.log 2>&1

Regards

Kai

On Wed, Mar 3, 2021 at 3:32 AM Thiago Macieira <mailto:thiago.macieira at intel.com<mailto:thiago.macieira at intel.com>> wrote:
On Tuesday, 2 March 2021 01:26:45 PST Liang Jian wrote:
> Hi everyone, I have a problem configuring qt6 under Windows 10, msvc 2019.
> My building environment is as follows:
>     1) I use the latest qt 6.1 branch from git
>     2) I have msvc 2019 installed under a windows 10 x64 machine
>     3) I have installed cmake 3.19.6 and copied the latest ninja.exe to
> cmake installation path (which is C:\Program Files\CMake\bin) and I am sure
> when I build qt6 from source cmake used is the one installed by me instead
> of the one installed with msvc

Ninja isn't mandatory, but a good idea.

>     4) I have installed Active perl 5.4.2/Active python 2.7.2
>
>     I build qt6 with the following commands:
> >     mkdir qt6-build
> >     cd qt6-build
> >     ..\qt5\configure.bat -prefix ..\qt6-win64 -developer-build -opengl

Don't use the configure scripts any more. Please use CMake directly.

>     I just can't figure out where the error comes from. I have no clue how
> I can solve this configuration error.
>     CMakeOutput.log and CMakeError.log have been attached.
>     Any suggestion is welcome! Thanks

The CMake logs aren't useful if the problem isn't compiling something. Please
paste the entire output from CMake.

We may need a run with --trace-expand to find out the decisions it made.

I spent over one hour to get past the "cmake" step yesterday on macOS. I have
not started on Windows. Will probably do that in June.

--
Thiago Macieira - thiago.macieira (AT) http://intel.com
  Software Architect - Intel DPG Cloud Engineering

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