[Pkg-kde-extras] Bug#1096918: kcolorpicker: ftbfs with GCC-15

[Matthias Klose]

Package: src:kcolorpicker
Version: 0.3.1-1
Severity: important
Tags: sid forky
User: debian-gcc at 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/kcolorpicker_0.3.1-1_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

[...]
/usr/lib/qt6/libexec/moc -DKIMAGEANNOTATOR_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DkColorPicker_EXPORTS -I/build/reproducible-path/kcolorpicker-0.3.1 -I/build/reproducible-path/kcolorpicker-0.3.1/include -I/build/reproducible-path/kcolorpicker-0.3.1/qt6/include -I/usr/include/x86_64-linux-gnu/qt6/QtWidgets -I/usr/include/x86_64-linux-gnu/qt6 -I/usr/include/x86_64-linux-gnu/qt6/QtCore -I/usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -I/usr/include/x86_64-linux-gnu/qt6/QtGui -I/usr/include -I/usr/include/c++/15 -I/usr/include/x86_64-linux-gnu/c++/15 -I/usr/include/c++/15/backward -I/usr/lib/gcc/x86_64-linux-gnu/15/include -I/usr/local/include -I/usr/include/x86_64-linux-gnu --include /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/moc_predefs.h --output-dep-file -o /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_ColorButton.cpp /build/reproducible-path/kcolorpicker-0.3.1/src/buttons/ColorButton.h
AutoMoc: Generating "SRC:/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_AbstractPopupMenuButton.cpp", because it doesn't exist, from "SRC:/src/buttons/AbstractPopupMenuButton.h"
/usr/lib/qt6/libexec/moc -DKIMAGEANNOTATOR_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DkColorPicker_EXPORTS -I/build/reproducible-path/kcolorpicker-0.3.1 -I/build/reproducible-path/kcolorpicker-0.3.1/include -I/build/reproducible-path/kcolorpicker-0.3.1/qt6/include -I/usr/include/x86_64-linux-gnu/qt6/QtWidgets -I/usr/include/x86_64-linux-gnu/qt6 -I/usr/include/x86_64-linux-gnu/qt6/QtCore -I/usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -I/usr/include/x86_64-linux-gnu/qt6/QtGui -I/usr/include -I/usr/include/c++/15 -I/usr/include/x86_64-linux-gnu/c++/15 -I/usr/include/c++/15/backward -I/usr/lib/gcc/x86_64-linux-gnu/15/include -I/usr/local/include -I/usr/include/x86_64-linux-gnu --include /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/moc_predefs.h --output-dep-file -o /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_AbstractPopupMenuButton.cpp /build/reproducible-path/kcolorpicker-0.3.1/src/buttons/AbstractPopupMenuButton.h
AutoMoc: Reading dependencies from "SRC:/qt6/kColorPicker_autogen/GGUL4PWQWN/moc_KColorPicker.cpp.d"
AutoMoc: Generating "SRC:/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_ColorDialogButton.cpp", because it doesn't exist, from "SRC:/src/buttons/ColorDialogButton.h"
/usr/lib/qt6/libexec/moc -DKIMAGEANNOTATOR_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DkColorPicker_EXPORTS -I/build/reproducible-path/kcolorpicker-0.3.1 -I/build/reproducible-path/kcolorpicker-0.3.1/include -I/build/reproducible-path/kcolorpicker-0.3.1/qt6/include -I/usr/include/x86_64-linux-gnu/qt6/QtWidgets -I/usr/include/x86_64-linux-gnu/qt6 -I/usr/include/x86_64-linux-gnu/qt6/QtCore -I/usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -I/usr/include/x86_64-linux-gnu/qt6/QtGui -I/usr/include -I/usr/include/c++/15 -I/usr/include/x86_64-linux-gnu/c++/15 -I/usr/include/c++/15/backward -I/usr/lib/gcc/x86_64-linux-gnu/15/include -I/usr/local/include -I/usr/include/x86_64-linux-gnu --include /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/moc_predefs.h --output-dep-file -o /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_ColorDialogButton.cpp /build/reproducible-path/kcolorpicker-0.3.1/src/buttons/ColorDialogButton.h
AutoMoc: Reading dependencies from "SRC:/qt6/kColorPicker_autogen/UVLADIE3JM/moc_PopupMenu.cpp.d"
AutoMoc: Reading dependencies from "SRC:/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_ColorButton.cpp.d"
AutoMoc: Reading dependencies from "SRC:/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_AbstractPopupMenuButton.cpp.d"
AutoMoc: Reading dependencies from "SRC:/qt6/kColorPicker_autogen/RGSDMPBIEV/moc_ColorDialogButton.cpp.d"
AutoMoc: Generating MOC compilation "SRC:/qt6/kColorPicker_autogen/mocs_compilation.cpp"
AutoMoc: Merging MOC dependencies into "SRC:/qt6/kColorPicker_autogen/deps"
AutoGen: Writing the parse cache file "SRC:/qt6/CMakeFiles/kColorPicker_autogen.dir/ParseCache.txt"
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AutoRcc: Generating "SRC:/qt6/kColorPicker_autogen/2SEMU33LXP/qrc_kColorPicker_icons.cpp", because it doesn't exist, from "SRC:/icons/kColorPicker_icons.qrc"
/usr/lib/qt6/libexec/rcc -name kColorPicker_icons -o /build/reproducible-path/kcolorpicker-0.3.1/qt6/kColorPicker_autogen/2SEMU33LXP/qrc_kColorPicker_icons.cpp /build/reproducible-path/kcolorpicker-0.3.1/icons/kColorPicker_icons.qrc
AutoRcc: Writing settings file "SRC:/qt6/CMakeFiles/kColorPicker_autogen.dir/AutoRcc_kColorPicker_icons_2SEMU33LXP_Used.txt"
cd /build/reproducible-path/kcolorpicker-0.3.1/qt6 && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /build/reproducible-path/kcolorpicker-0.3.1 /build/reproducible-path/kcolorpicker-0.3.1 /build/reproducible-path/kcolorpicker-0.3.1/qt6 /build/reproducible-path/kcolorpicker-0.3.1/qt6 /build/reproducible-path/kcolorpicker-0.3.1/qt6/CMakeFiles/kColorPicker.dir/DependInfo.cmake "--color="
Dependencies file "kColorPicker_autogen/deps" is newer than depends file "/build/reproducible-path/kcolorpicker-0.3.1/qt6/CMakeFiles/kColorPicker.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target kColorPicker
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/usr/bin/ld: CMakeFiles/kColorPicker.dir/src/common/ScaledSizeProvider.cpp.o:(.rodata+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/kColorPicker.dir/kColorPicker_autogen/mocs_compilation.cpp.o:(.rodata+0x54c): first defined here
collect2: error: ld returned 1 exit status
/usr/bin/c++ -fPIC -g -O2 -ffile-prefix-map=/build/reproducible-path/kcolorpicker-0.3.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,--dependency-file=CMakeFiles/kColorPicker.dir/link.d -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libkColorPicker-Qt6.so.0 -o lib/libkColorPicker-Qt6.so.0.3.1 CMakeFiles/kColorPicker.dir/kColorPicker_autogen/mocs_compilation.cpp.o CMakeFiles/kColorPicker.dir/src/KColorPicker.cpp.o CMakeFiles/kColorPicker.dir/src/PopupMenu.cpp.o CMakeFiles/kColorPicker.dir/src/IconCreator.cpp.o CMakeFiles/kColorPicker.dir/src/buttons/AbstractPopupMenuButton.cpp.o CMakeFiles/kColorPicker.dir/src/buttons/ColorButton.cpp.o CMakeFiles/kColorPicker.dir/src/buttons/ColorDialogButton.cpp.o CMakeFiles/kColorPicker.dir/src/common/ScaledSizeProvider.cpp.o CMakeFiles/kColorPicker.dir/kColorPicker_autogen/2SEMU33LXP/qrc_kColorPicker_icons.cpp.o  /usr/lib/x86_64-linux-gnu/libQt6Widgets.so.6.7.2 /usr/lib/x86_64-linux-gnu/libQt6Gui.so.6.7.2 /usr/lib/x86_64-linux-gnu/libGLX.so /usr/lib/x86_64-linux-gnu/libOpenGL.so /usr/lib/x86_64-linux-gnu/libQt6Core.so.6.7.2
make[4]: *** [CMakeFiles/kColorPicker.dir/build.make:251: lib/libkColorPicker-Qt6.so.0.3.1] Error 1
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make[3]: *** [CMakeFiles/Makefile2:141: CMakeFiles/kColorPicker.dir/all] Error 2
make[3]: Leaving directory '/build/reproducible-path/kcolorpicker-0.3.1/qt6'
make[2]: *** [Makefile:139: all] Error 2
make[2]: Leaving directory '/build/reproducible-path/kcolorpicker-0.3.1/qt6'
dh_auto_build: error: cd qt6 && make -j8 "INSTALL=install --strip-program=true" VERBOSE=1 returned exit code 2
make[1]: *** [debian/rules:24: override_dh_auto_build] Error 25
make[1]: Leaving directory '/build/reproducible-path/kcolorpicker-0.3.1'
make: *** [debian/rules:16: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2