Project ERROR: Unknown module(s) in QT: waylandclient-private

ybakos

Thank you for all things Qt, and I apologize if this is not the right forum to seek assistance about this issue.

I have Qt 5.8 installed with QtCreator 4.2.1, all of which I installed using the downloadable installer script from the Qt web site. Using Fedora 23.

I have cloned https://github.com/cordlandwehr/fosdem-2017-talk-qtwayland and have opened the demo.pro project in QtCreator. However, the "General Messages" panel displays:

Project ERROR: Unknown module(s) in QT: waylandclient-private
Project ERROR: Unknown module(s) in QT: waylandclient-private
Project ERROR: Unknown module(s) in QT: waylandcompositor-privatea

Would anyone please be able to tell me why I see these messages, and what I need to do in order to squelch them and build the demo project?

SGaist

Hi and welcome to devnet,

You need to first clone and build the module before you can use it with your project.

ybakos

Should I build the QtWayland project with QtCreator? Here's what I've done.

I've cloned the qtwayland repo, and I've opened the project, using qtwayland.pro in QtCreator. Apologies for the error dump here, but I see the following General Messages:

Project ERROR: Could not find feature wayland-client.
[Inexact] Project MESSAGE: perl -w /home/ybakos/Qt/5.8/gcc_64/bin/syncqt.pl -module QtWaylandClient -version 5.9.0 -outdir /home/ybakos/projects/build-qtwayland-Desktop_Qt_5_8_0_GCC_64bit-Debug /home/ybakos/projects/qtwayland
[Inexact] Project MESSAGE: perl -w /home/ybakos/Qt/5.8/gcc_64/bin/syncqt.pl -module QtWaylandCompositor -version 5.9.0 -outdir /home/ybakos/projects/build-qtwayland-Desktop_Qt_5_8_0_GCC_64bit-Debug /home/ybakos/projects/qtwayland
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Could not find feature wayland-egl.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Could not find feature wayland-egl.
[Inexact] Project ERROR: Could not find feature wayland-egl.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.

Are those project errors telling me it can't find certain dependencies?
I currently have wayland built from source and installed in ~/install, for development. Should I install wayland as a package on my system, or should I somehow point my project to ~/install/lib ?

SGaist

You should add something like

qmake "INCLUDEPATH += /path/to/wayland/includes" "LIBS +=-L/path/to/wayland/libraries"

You can add these parameters also in Qt Creator.

ybakos

Thank you @SGaist I appreciate the help. I have modified my qtwayland.pro file, which now contains:

requires(linux:!android)
load(qt_parts)
INCLUDEPATH += /home/ybakos/install/include
LIBS +=-L/home/ybakos/install/lib

But I still see the following General Messages:

[Inexact] Project MESSAGE: perl -w /home/ybakos/Qt/5.8/gcc_64/bin/syncqt.pl -module QtWaylandClient -version 5.9.0 -outdir /home/ybakos/projects/build-qtwayland-Desktop_Qt_5_8_0_GCC_64bit-Debug /home/ybakos/projects/qtwayland
[Inexact] Project MESSAGE: perl -w /home/ybakos/Qt/5.8/gcc_64/bin/syncqt.pl -module QtWaylandCompositor -version 5.9.0 -outdir /home/ybakos/projects/build-qtwayland-Desktop_Qt_5_8_0_GCC_64bit-Debug /home/ybakos/projects/qtwayland
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
Project ERROR: Could not find feature wayland-client.
[Inexact] Project ERROR: Could not find feature wayland-egl.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Could not find feature wayland-egl.
[Inexact] Project ERROR: Could not find feature wayland-egl.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'wayland-client' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.
[Inexact] Project ERROR: Library 'wayland-server' is not defined.
[Inexact] Project ERROR: Library 'xcomposite' is not defined.

My ~/install/include contains the Wayland header files, and my ~/install/lib contains the library files (eg. libwayland-client.so, etc).

I did clear the message pane and re-open the project.

SGaist

Ok, I've missed something, you have the dev branch checked out. There's been a big rework of the build handling.
I'm not yet used to the internal details but I think you need to use something like:

QMAKE_LIBDIR_XCOMPOSITE+=/path/to/xcomposite/libs/
QMAKE_INCDIR_XCOMPOSITE+=/path/to/xcomposite/includes/

in place of the INCLUDEPATH and LIBS variables.

ybakos

Is xcomposite a separate dependency from libxkbcommon? If so, it doesn't seem that the xcomposite dependency is documented anywhere.

ybakos

I've built xcomposite from source and installed in ~/install/lib.

I am indeed on the dev branch of qtwayland. I've pulled the latest HEAD.

My qtwayland.pro contains:

requires(linux:!android)
load(qt_parts)
INCLUDEPATH += /home/ybakos/install/include
LIBS +=-L/home/ybakos/install/lib
QMAKE_INCDIR_XCOMPOSITE+=/home/ybakos/install/include
QMAKE_LIBDIR_XCOMPOSITE+=/home/ybakos/install/lib

Yet I still see the same errors in the General Messages panel.

I also get the same results when commenting out INCLUDEPATH and LIBS and just using the QMAKE* config vars.

I also get the same results when using the 5.8 branch.

I've now also tried building qtwayland without using QtCreator. The output of just qmake (no additional options passed) is:

Info: creating cache file /home/ybakos/projects/qtwayland/.qmake.cache

Running configuration tests...
Checking for Wayland client library... yes
Checking for Wayland cursor library... yes
Checking for wayland-scanner... yes
Checking for DRM EGL Server... yes
Checking for libhybris EGL Server... no
Checking for Wayland EGL library... yes
Checking for XComposite... yes
Checking for GLX... yes
Checking for wayland-server... yes
Done running configuration tests.

Configure summary:

Qt Wayland Drivers:
  EGL .................................... yes
  Rasberry Pi ............................ no
  XComposite EGL ......................... yes
  XComposite GLX ......................... yes
  DRM EGL ................................ yes
  libhybris EGL .......................... no
Qt Wayland Client ........................ yes
Qt Wayland Compositor .................... yes

However, running make results in a linker error: http://pastebin.com/3bL8c7Jy

Thank you for any tips, @SGaist .

SGaist

Do you have the dev package from libxkbcommon installed ? If so which version ?

ybakos

Thank you again, @SGaist . I installed libxcbcommon from source, which is installed in the same place as my wayland libs and includes. I am going to install the package, try rebuilding and report back.

ybakos

All right. I have now installed the libxkbcommon-devel package, version 0.6.1.

$ rpm -q libxkbcommon-devel
libxkbcommon-devel-0.6.1-1.fc23.x86_64

I also pulled the latest xkbcommon, built and reinstalled in ~/install/lib.

When rebuilding qtwayland, I see the same error.

The contents of my ~/install/lib are listed in a pastebin here.

Thanks again, @SGaist .

SGaist

Did you check in the build log that you are using your own build of libxkbcommon ?

ybakos

@SGaist I haven't found a reference to libxkbcommon anywhere in the log produced by make. I've pasted the entire results of make here.

Am I looking in the wrong place?

Alex S.

I'm seeing similar problems with using Wayland compositor and then in my attempts to build the QtWayland module (Qt 5.8). It would be good if some comprehensive instructions (incl. dependencies) could be provided.

ybakos

qwaylandxkb.cpp only includes

#include <xkbcommon/xkbcommon-keysyms.h>

Yet xkb_keysym_to_utf32 is defined in xkbcommon/xkbcommon.h.

But even if I include that header in qwaylandxkb.cpp, I still get the same error.

Grrrr!

I do notice that in my config.cache there is no mention of xkbcommon, unlike the other dependencies.

ybakos

Ah, but qwaylandxkb.cpp does include qwaylandxkb.h, which in turn includes xkbcommon/xkbcommon.h.

I've perhaps noticed another clue. During a make clean I see the error:

Project ERROR: Library 'xkbcommon_evdev' is not defined.

I've also found the possibly relevant bugs:

ybakos

I've filed a new bug report:
https://bugreports.qt.io/browse/QTBUG-58839

SGaist

Thanks for sharing your findings and the link !

ybakos

But isn't there something I can do to fix this? (Is it a build config?)

I'm open to suggestions.

In the mean time, I'm going to set up a dev env on Fedora 25 and see if I get the same error.

ybakos

Same environment configuration on Fedora 25, and the same build error occurs.
Is there some detail regarding the config/make of libxkbcommon that is missing?