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:

Download the source code from https://gitlab.freedesktop.org/wayland/wayland and checkout the latest version (in my case, it was 1.23.1)
Build with instructions from README.txt with PREFIX (the path to the library is in your system).
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)
Do sudo ldconfig

I hope it helps.