Bug#1097729: qt6-multimedia: ftbfs with GCC-15

To: maintonly@bugs.debian.org
Subject: Bug#1097729: qt6-multimedia: ftbfs with GCC-15
From: Matthias Klose <doko@debian.org>
Date: Mon, 17 Feb 2025 17:48:28 +0000
Message-id: <[🔎] E1tk5EK-009PDb-To@paradis.debian.org>
Reply-to: Matthias Klose <doko@debian.org>, 1097729-maintonly@bugs.debian.org
Package: src:qt6-multimedia
Version: 6.7.2-7
Severity: important
Tags: sid forky
User: debian-gcc@lists.debian.org
Usertags: ftbfs-gcc-15

[This bug is NOT targeted to the upcoming trixie release]

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-15/g++-15, but succeeds to build with gcc-14/g++-14. The
severity of this report will be raised before the forky release.

The full build log can be found at:
http://qa-logs.debian.net/2025/02/16/amd64exp/qt6-multimedia_6.7.2-7_unstable_gccexp.log.gz
The last lines of the build log are at the end of this report.

To build with GCC 15, either set CC=gcc-15 CXX=g++-15 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

GCC 15 now defaults to the C23/C++23 standards, exposing many FTBFS.
Other Common build failures are new warnings resulting in build failures
with -Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-15/porting_to.html

[...]
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/usr/bin/ld: src/multimedia/CMakeFiles/Multimedia.dir/pulseaudio/qpulseaudiodevice.cpp.o (symbol from plugin): in function `QPulseAudioDeviceInfo::QPulseAudioDeviceInfo(char const*, char const*, bool, QAudioDevice::Mode)':
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/usr/bin/ld: src/multimedia/CMakeFiles/Multimedia.dir/pulseaudio/qaudioengine_pulse.cpp.o (symbol from plugin): in function `QPulseAudioEngine::release()':
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/usr/bin/ld: src/multimedia/CMakeFiles/Multimedia.dir/pulseaudio/qpulseaudiosource.cpp.o (symbol from plugin): in function `QPulseAudioSource::format() const':
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/usr/bin/ld: src/multimedia/CMakeFiles/Multimedia.dir/pulseaudio/qpulsehelpers.cpp.o (symbol from plugin): in function `qLcPulseAudioOut()':
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/usr/bin/ld: src/multimedia/CMakeFiles/Multimedia.dir/pulseaudio/qpulseaudiomediadevices.cpp.o (symbol from plugin): in function `QPulseAudioMediaDevices::~QPulseAudioMediaDevices()':
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collect2: error: ld returned 1 exit status
[370/734] /usr/bin/c++ -DQMLVIDEO_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_QMLBUILTINS_LIB -DQT_QMLINTEGRATION_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICK_LIB -Dqmlvideo_EXPORTS -I/build/reproducible-path/qt6-multimedia-6.7.2/obj-x86_64-linux-gnu/examples/multimedia/video/qmlvideo/qmlvideo/qmlvideo_autogen/include -I/build/reproducible-path/qt6-multimedia-6.7.2/examples/multimedia/video/qmlvideo/qmlvideo -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2/QtQml -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6 -isystem /usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2/QtQmlBuiltins -isystem /usr/includ
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[371/734] /usr/bin/c++ -DQMLVIDEO_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_QMLBUILTINS_LIB -DQT_QMLINTEGRATION_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICK_LIB -Dqmlvideo_EXPORTS -I/build/reproducible-path/qt6-multimedia-6.7.2/obj-x86_64-linux-gnu/examples/multimedia/video/qmlvideo/qmlvideo/qmlvideo_autogen/include -I/build/reproducible-path/qt6-multimedia-6.7.2/examples/multimedia/video/qmlvideo/qmlvideo -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2/QtQml -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6 -isystem /usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2/QtQmlBuiltins -isystem /usr/includ
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[372/734] /usr/bin/c++ -DQMLVIDEO_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_QMLBUILTINS_LIB -DQT_QMLINTEGRATION_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICK_LIB -Dqmlvideo_EXPORTS -I/build/reproducible-path/qt6-multimedia-6.7.2/obj-x86_64-linux-gnu/examples/multimedia/video/qmlvideo/qmlvideo/qmlvideo_autogen/include -I/build/reproducible-path/qt6-multimedia-6.7.2/examples/multimedia/video/qmlvideo/qmlvideo -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2/QtQml -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6 -isystem /usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2/QtQmlBuiltins -isystem /usr/includ
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[373/734] /usr/bin/c++ -DQMLVIDEO_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_QMLBUILTINS_LIB -DQT_QMLINTEGRATION_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICK_LIB -Dqmlvideo_EXPORTS -I/build/reproducible-path/qt6-multimedia-6.7.2/obj-x86_64-linux-gnu/examples/multimedia/video/qmlvideo/qmlvideo/qmlvideo_autogen/include -I/build/reproducible-path/qt6-multimedia-6.7.2/examples/multimedia/video/qmlvideo/qmlvideo -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2/QtQml -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6 -isystem /usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2/QtQmlBuiltins -isystem /usr/includ
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 e/qmlvideo_CameraRotate_qml.cpp.o -c /build/reproducible-path/qt6-multimedia-6.7.2/obj-x86_64-linux-gnu/examples/multimedia/video/qmlvideo/qmlvideo/.rcc/qmlcache/qmlvideo_CameraRotate_qml.cpp
[375/734] /usr/bin/c++ -DQMLVIDEO_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_QMLBUILTINS_LIB -DQT_QMLINTEGRATION_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICK_LIB -Dqmlvideo_EXPORTS -I/build/reproducible-path/qt6-multimedia-6.7.2/obj-x86_64-linux-gnu/examples/multimedia/video/qmlvideo/qmlvideo/qmlvideo_autogen/include -I/build/reproducible-path/qt6-multimedia-6.7.2/examples/multimedia/video/qmlvideo/qmlvideo -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml/6.7.2/QtQml -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore/6.7.2/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6/QtCore -isystem /usr/include/x86_64-linux-gnu/qt6 -isystem /usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2 -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlBuiltins/6.7.2/QtQmlBuiltins -isystem /usr/includ
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 e/x86_64-linux-gnu/qt6/QtQmlBuiltins -isystem /usr/include/x86_64-linux-gnu/qt6/QtQml -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlIntegration -isystem /usr/include/x86_64-linux-gnu/qt6/QtNetwork -isystem /usr/include/x86_64-linux-gnu/qt6/QtGui -isystem /usr/include/x86_64-linux-gnu/qt6/QtQuick -isystem /usr/include/x86_64-linux-gnu/qt6/QtQmlModels -isystem /usr/include/x86_64-linux-gnu/qt6/QtOpenGL -g -O2 -ffile-prefix-map=/build/reproducible-path/qt6-multimedia-6.7.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -std=gnu++17 -fPIC -Wall -Wextra -MD -MT examples/multimedia/video/qmlvideo/qmlvideo/CMakeFiles/qmlvideo.dir/.rcc/qmlcache/qmlvideo_Content_qml.cpp.o -MF examples/multimedia/video/qmlvideo/qmlvideo/CMakeFiles/qmlvideo.dir/.rcc/qmlcache/qmlvideo_Content_qml.cpp.o.d -o examples/multimedia/video/qmlvideo/qmlvideo/CMakeFiles/qmlvideo.dir/.rcc/qmlcache/qmlvideo
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ninja: build stopped: subcommand failed.
dh_auto_build: error: cd obj-x86_64-linux-gnu && LC_ALL=C.UTF-8 ninja -j8 -v returned exit code 1
make: *** [debian/rules:21: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
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