Build error on qt 6.8

Qt embedded developer · 4 Apr 2025, 07:55

when i run qt quick simple example using qt 6.8 i am getting below error:

":-1: error: CMakeFiles/appRectangle.dir/main.cpp.o: undefined reference to symbol '_ZdlPvm@@CXXABI_1.3.9'
:-1: error: /usr/lib64/libstdc++.so.6: error adding symbols: DSO missing from command line
:-1: error: collect2: error: ld returned 1 exit status
:-1: error: [CMakeFiles/appRectangle.dir/build.make:266: appRectangle] Error 1"

Solution: adding stdc++ in below code

target_link_libraries(appRectangle
   PRIVATE Qt6::Quick stdc++
)

why compile out put generate this many lines :

CCACHE_NODISABLE=true
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DEBUGINFOD_URLS=https://debuginfod.fedoraproject.org/ 
DESKTOP_SESSION=gnome
DISPLAY=:0
EDITOR=/usr/bin/nano
EMSDK=/home/ma/WebAssembly/emsdk
EMSDK_NODE=/home/ma/WebAssembly/emsdk/node/16.20.0_64bit/bin/node
EM_CACHE=/home/ma/WebAssembly/emsdk/upstream/emscripten/cache
EM_CONFIG=/home/ma/WebAssembly/emsdk/.emscripten
GDMSESSION=gnome
GDM_LANG=en_US.UTF-8
GIO_LAUNCHED_DESKTOP_FILE=/home/ma/.local/share/applications/org.qt-project.qtcreator.desktop
GIO_LAUNCHED_DESKTOP_FILE_PID=4957
GITHUB_TOKEN=ghp_YDxEGA24MePZ5
GJS_DEBUG_OUTPUT=stderr
GJS_DEBUG_TOPICS=JS ERROR;JS LOG
GNOME_SETUP_DISPLAY=:1
HISTCONTROL=ignoredups
HISTSIZE=1000
HOME=/home/ma
HOSTNAME=fedora
INVOCATION_ID=ea7079b8c6
JFROG_API_KEY=AKCpM
JFROG_USERNAME=ma
JOURNAL_STREAM=8:16781
LANG=en_US.UTF-8
LD_LIBRARY_PATH=/home/ma/Qt6.8.3/6.8.3/gcc_64/lib:/usr/lib::/usr/local/lib
LESSOPEN=||/usr/bin/lesspipe.sh %s
LOCAL_DEV_MACHINE=true
LOGNAME=ma
MAIL=/var/spool/mail/ma
MANAGERPID=2085
MOZ_GMP_PATH=/usr/lib64/mozilla/plugins/gmp-gmpopenh264/system-installed
PATH=/home/ma/WebAssembly/emsdk:/home/ma/WebAssembly/emsdk/upstream/emscripten:/home/ma/WebAssembly/emsdk/node/16.20.0_64bit/bin:/home/ma/.local/bin:/home/ma/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/var/lib/snapd/snap/bin
PWD=/home/ma
QTDIR=/home/ma/Qt6.8.3/6.8.3/gcc_64
QT_IM_MODULE=ibus
QT_QPA_PLATFORM=xcb
SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/2268,unix/unix:/tmp/.ICE-unix/2268
SHELL=/bin/bash
SHLVL=0
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
SYSTEMD_EXEC_PID=2329
USER=ma
USERNAME=ma
WAYLAND_DISPLAY=wayland-0
XAUTHORITY=/run/user/1000/.mutter-Xwaylandauth.C1SZ32
XDG_CURRENT_DESKTOP=GNOME
XDG_DATA_DIRS=/home/ma/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop
XDG_MENU_PREFIX=gnome-
XDG_RUNTIME_DIR=/run/user/1000
XDG_SESSION_CLASS=user
XDG_SESSION_DESKTOP=gnome
XDG_SESSION_TYPE=wayland
XMODIFIERS=@im=ibus
_QTC_LD_LIBRARY_PATH=/home/ma/Qt6.8.3/6.8.3/gcc_64/lib

why in older version it works fine without adding it? what is correct solution for it on linux?

question 2: why cmake modules in qt creator get invisible in latest version qt 6.8?

Axel Spoerl · Q Qt embedded developer 4 Apr 2025, 06:01

I am a bit confused about what your question is.

why compile out put generate this many lines :

That's not a compile output.

why in older version it works fine without adding it?

Which older version? What works fine without adding what?

what is correct solution for it on linux?

The correct solution for what?

question 2: why cmake modules in qt creator get invisible in latest version qt 6.8?

I have already counted three questions before "question 2".
Never mind, CMake modules don't get invisible in 6.8.

If the actual question is:
Where does the undefined reference to symbol ... come from?
=> Probably the compiler isn't compatible with C++ ABI version 1.3.9.
=> But that's just a guess, since we don't know what you are compiling, which compiler you use on which operating system.

Qt embedded developer

@Axel-Spoerl ![alt text]( image url)

what is this ? why it get shown there?

answer of Which older version? What works fine without adding what?:

older version: qt 5.15.2. my below source code works fine with this version. but for qt 6.8.2 version i need to explicitly need to add stdc++ as shown below :

target_link_libraries(appqmlbasic
PRIVATE Qt6::Quick stdc++
)

import QtQuick

Window {
   width: 640
   height: 480
   visible: true
   title: qsTr("Hello World")
}

why i need to add stdc++ that way ?what is right solution for avoiding adding explicitly stdc++ in target link library ?

i am using fedor, so compiler is gcc.

if your answer is : compiler isn't compatible with C++ ABI version 1.3.9

then what is solution to make it compatible on fedora for qt 6.8.2?

Axel Spoerl

@Qt-embedded-developer said in Build error on qt 6.8:

what is this ? why it get shown there?

It's the compile output. It gets shown here, because you have selected tab No. 4 "Compile Output".

You don't have to explicitly link to stdc++.

i am using fedor, so compiler is gcc.

What does

gcc --version

say?

Here is some general documentation about compiling Qt sources, which includes a section about required GCC versions.
Here is a list of libraries /headers needed to compile Qt on Linux.

Fedora isn't officially supported. That doesn't mean you can't build or use it, but there are no official instructions how to break down the list of required libraries / headers to Fedora packages.
There is an old wiki page related to Qt5, which has some instructions for Fedora 30. You could use that as a starting point.

Qt embedded developer

@Axel-Spoerl said in Build error on qt 6.8:

gcc --version

it say:
gcc (GCC) 13.2.1 20240316 (Red Hat 13.2.1-7)
Copyright (C) 2023 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.