Qt 6.5.1 Program execution

[rienna]

Installing Qt 6.5.1 for Desktop - the execution of x-Debug shows following
message

QML debugging is enabled. Only use this in a safe environment.
/qt/qml_t/TDT-Debug/TDT: symbol lookup error: /opt/qt/6.5.1/gcc_64/lib/libQt6WaylandClient.so.6: undefined symbol: wl_proxy_marshal_flags
14:38:50: /qt/qml_t/TDT-Debug/TDT exited with code 127

who can help ?

[JoeCFD]

@rienna do the following:
ldd /opt/qt/6.5.1/gcc_64/lib/libQt6WaylandClient.so.6
to check which wayland lib or its dependency is missing. Show your results here.

[rienna]

linux-vdso.so.1 (0x00007ffc8effd000)
libwayland-client.so.0 => /usr/lib64/libwayland-client.so.0 (0x00007fabea91d000)
libwayland-cursor.so.0 => /usr/lib64/libwayland-cursor.so.0 (0x00007fabea914000)
libQt6Gui.so.6 => /opt/Qt/6.5.1/gcc_64/lib/libQt6Gui.so.6 (0x00007fabe9f50000)
libGL.so.1 => /usr/lib64/libGL.so.1 (0x00007fabe9cc5000)
libQt6Core.so.6 => /opt/Qt/6.5.1/gcc_64/lib/libQt6Core.so.6 (0x00007fabe9639000)
libxkbcommon.so.0 => /usr/lib64/libxkbcommon.so.0 (0x00007fabe93f5000)
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007fabe8fd2000)
libm.so.6 => /lib64/libm.so.6 (0x00007fabe8e87000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fabe8c68000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fabe8c44000)
libc.so.6 => /lib64/libc.so.6 (0x00007fabe8a4f000)
libffi.so.7 => /usr/lib64/libffi.so.7 (0x00007fabe8843000)
libEGL.so.1 => /usr/lib64/libEGL.so.1 (0x00007fabe8630000)
libfontconfig.so.1 => /usr/lib64/libfontconfig.so.1 (0x00007fabe83eb000)
libX11.so.6 => /usr/lib64/libX11.so.6 (0x00007fabe80aa000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fabe80a5000)
libglib-2.0.so.0 => /usr/lib64/libglib-2.0.so.0 (0x00007fabe7f70000)
libQt6DBus.so.6 => /opt/Qt/6.5.1/gcc_64/lib/libQt6DBus.so.6 (0x00007fabe7ea8000)
libz.so.1 => /lib64/libz.so.1 (0x00007fabe7c91000)
libfreetype.so.6 => /usr/lib64/libfreetype.so.6 (0x00007fabe79d3000)
libgthread-2.0.so.0 => /usr/lib64/libgthread-2.0.so.0 (0x00007fabe79d0000)
libGLX.so.0 => /usr/lib64/libGLX.so.0 (0x00007fabe779f000)
libGLdispatch.so.0 => /usr/lib64/libGLdispatch.so.0 (0x00007fabe74e9000)
libicui18n.so.56 => /opt/Qt/6.5.1/gcc_64/lib/libicui18n.so.56 (0x00007fabe704e000)
libicuuc.so.56 => /opt/Qt/6.5.1/gcc_64/lib/libicuuc.so.56 (0x00007fabe6c96000)
libicudata.so.56 => /opt/Qt/6.5.1/gcc_64/lib/libicudata.so.56 (0x00007fabe52b3000)
librt.so.1 => /lib64/librt.so.1 (0x00007fabe52a9000)
/lib64/ld-linux-x86-64.so.2 (0x00007fabeaa42000)
libexpat.so.1 => /usr/lib64/libexpat.so.1 (0x00007fabe506a000)
libuuid.so.1 => /usr/lib64/libuuid.so.1 (0x00007fabe505f000)
libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x00007fabe4e36000)
libpcre.so.1 => /usr/lib64/libpcre.so.1 (0x00007fabe4bad000)
libdbus-1.so.3 => /usr/lib64/libdbus-1.so.3 (0x00007fabe495b000)
libbz2.so.1 => /usr/lib64/libbz2.so.1 (0x00007fabe473e000)
libpng16.so.16 => /usr/lib64/libpng16.so.16 (0x00007fabe44fb000)
libXau.so.6 => /usr/lib64/libXau.so.6 (0x00007fabe42f5000)
libsystemd.so.0 => /usr/lib64/libsystemd.so.0 (0x00007fabe4212000)
liblzma.so.5 => /usr/lib64/liblzma.so.5 (0x00007fabe3fd8000)
libzstd.so.1 => /usr/lib64/libzstd.so.1 (0x00007fabe3ea7000)
liblz4.so.1 => /usr/lib64/liblz4.so.1 (0x00007fabe3c86000)
libcap.so.2 => /usr/lib64/libcap.so.2 (0x00007fabe3a7a000)
libgcrypt.so.20 => /usr/lib64/libgcrypt.so.20 (0x00007fabe393c000)

  is there something missing ?

thanks

[JoeCFD]

@rienna no missing lib. The problem might be libwayland* version is too old that they do not include wl_proxy_marshal_flags. You may need to upgrade them.

===some people suggested:
You can reinstall the wayland package to fix the listed errors
https://bbs.archlinux.org/viewtopic.php?id=272846

[hayato_8810]

Hi, I encountered the same problem.

@rienna
Did you solve the problem?
If you clould do, please let me know how to do that.

@JoeCFD
I reinstalled "libwayland-client0" and "libwayland-cursor0", but the problem still exist.
Is there something wrong?

[hayato_8810]

I left reults of this issue , the problem is fundamentally caused by the version of wayland as @JoeCFD mentionned.
In my case, Ubuntu 20.04 and Qt 6.5.1 LTS was installed.
The function "wl_proxy_marshal_flags" is defined in /src/wayland-client-core.h from Wayland ver.1.20, but the Ubuntu package does not support it. The supported version is 1.18 officially.
https://ubuntu.pkgs.org/20.04/ubuntu-main-amd64/libwayland-client0_1.18.0-1_amd64.deb.html

I tried to install new version wayland manually, but unsupported version of meson was required as well.
https://gitlab.freedesktop.org/wayland/wayland/-/tree/main

I have no other way to update Ubuntu to 22.04 and did that.

[Okko Willeboordse]

Please refer to https://bugreports.qt.io/browse/QTBUG-114635

[Vlad.P.]

I caught the same problem with my Ubuntu 20.04 and Qt 6.7.1. I fixed it. You need to get the latest libwayland and build it.

I hope the next instructions helps you:

1. Download the source code from https://gitlab.freedesktop.org/wayland/wayland and checkout the latest version (in my case, it was 1.23.1)
2. Build with instructions from README.txt with PREFIX (the path to the library is in your system).
3. Create /etc/ld.so.conf.d/wayland.conf and put in it the path to your new wayland libs (in my case: /opt/wayland/lib64)
4. Do sudo ldconfig

I hope it helps.