[Pkg-owncloud-maintainers] Bug#1097458: nextcloud-desktop: ftbfs with GCC-15

[Matthias Klose]

Package: src:nextcloud-desktop
Version: 3.15.2-2
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/nextcloud-desktop_3.15.2-2_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

[...]
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/__/common/plugin.cpp.o -MF CMakeFiles/nextcloud_csync.dir/__/common/plugin.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/__/common/plugin.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/common/plugin.cpp
collect2: error: ld returned 1 exit status
/usr/bin/c++ -fPIC -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fno-operator-names -fno-exceptions -Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security -Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type -Werror=init-self -Werror=undef -Wvla -Wdate-time -Wsuggest-override -Wlogical-op -pedantic -Wzero-as-null-pointer-constant -Wmissing-include-dirs -Wl,--no-undefined -Wl,--fatal-warnings -Wl,--enable-new-dtags -flto=auto -ffat-lto-objects -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnextclouddolphinpluginhelper.so -o ../../bin/libnextclouddolphinpluginhelper.so CMakeFiles/nextclouddolphinpluginhelper.dir/nextclouddolphinpluginhelper_autogen/mocs_compilation.cpp.o CMakeFiles/nextclouddolphinpluginhelper.dir/ownclouddolphinpluginhelper.cpp.o  /usr/lib/x86_64-linux-gnu/libQt6Network.so.6.7.2 /usr/lib/x86_64-linux-gnu/libQt6Core.so.6.7.2
make[4]: *** [shell_integration/dolphin/CMakeFiles/nextclouddolphinpluginhelper.dir/build.make:125: bin/libnextclouddolphinpluginhelper.so] Error 1
make[4]: Leaving directory '/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu'
make[3]: *** [CMakeFiles/Makefile2:3375: shell_integration/dolphin/CMakeFiles/nextclouddolphinpluginhelper.dir/all] Error 2
make[3]: *** Waiting for unfinished jobs....
[  4%] Building CXX object src/csync/CMakeFiles/nextcloud_csync.dir/__/common/syncfilestatus.cpp.o
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/__/common/syncfilestatus.cpp.o -MF CMakeFiles/nextcloud_csync.dir/__/common/syncfilestatus.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/__/common/syncfilestatus.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/common/syncfilestatus.cpp
[  4%] Building CXX object src/csync/CMakeFiles/nextcloud_csync.dir/__/common/utility_unix.cpp.o
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/__/common/utility_unix.cpp.o -MF CMakeFiles/nextcloud_csync.dir/__/common/utility_unix.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/__/common/utility_unix.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/common/utility_unix.cpp
[  4%] Building CXX object src/csync/CMakeFiles/nextcloud_csync.dir/csync.cpp.o
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/csync.cpp.o -MF CMakeFiles/nextcloud_csync.dir/csync.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/csync.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/csync.cpp
[  4%] Building CXX object src/csync/CMakeFiles/nextcloud_csync.dir/csync_exclude.cpp.o
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/csync_exclude.cpp.o -MF CMakeFiles/nextcloud_csync.dir/csync_exclude.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/csync_exclude.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/csync_exclude.cpp
[  4%] Building CXX object src/csync/CMakeFiles/nextcloud_csync.dir/std/c_time.cpp.o
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/std/c_time.cpp.o -MF CMakeFiles/nextcloud_csync.dir/std/c_time.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/std/c_time.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std/c_time.cpp
[  5%] Building CXX object src/csync/CMakeFiles/nextcloud_csync.dir/vio/csync_vio_local_unix.cpp.o
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/c++ -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051200 -DQT_MESSAGELOGCONTEXT -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_URL_CAST_FROM_STRING -DQT_USE_QSTRINGBUILDER -DUNICODE -D_UNICODE -Dnextcloud_csync_EXPORTS -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync/nextcloud_csync_autogen/include -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu -I/build/reproducible-path/nextcloud-desktop-3.15.2/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src -I/build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/std -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/QtConcurrent -g -O2 -ffile-prefix-map=/build/reproducible-path/nextcloud-desktop-3.15.2=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic -fstack-protector-strong -std=gnu++17 -fPIC -fdiagnostics-color=always -MD -MT src/csync/CMakeFiles/nextcloud_csync.dir/vio/csync_vio_local_unix.cpp.o -MF CMakeFiles/nextcloud_csync.dir/vio/csync_vio_local_unix.cpp.o.d -o CMakeFiles/nextcloud_csync.dir/vio/csync_vio_local_unix.cpp.o -c /build/reproducible-path/nextcloud-desktop-3.15.2/src/csync/vio/csync_vio_local_unix.cpp
[  5%] Linking CXX shared library libnextcloud_csync.so
cd /build/reproducible-path/nextcloud-desktop-3.15.2/obj-x86_64-linux-gnu/src/csync && /usr/bin/cmake -E cmake_link_script CMakeFiles/nextcloud_csync.dir/link.txt --verbose=1
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/checksums.cpp.o (symbol from plugin): in function `OCC::lcChecksums()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/checksumcalculator.cpp.o (symbol from plugin): in function `OCC::lcChecksumCalculator()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/filesystembase.cpp.o (symbol from plugin): in function `OCC::lcFileSystem()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/ownsql.cpp.o (symbol from plugin): in function `OCC::lcSql()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/preparedsqlquerymanager.cpp.o (symbol from plugin): in function `OCC::PreparedSqlQuery::PreparedSqlQuery(OCC::SqlQuery*, bool)':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/syncjournaldb.cpp.o (symbol from plugin): in function `OCC::lcDb()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/syncjournalfilerecord.cpp.o (symbol from plugin): in function `OCC::SyncJournalErrorBlacklistRecord::isValid() const':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/utility.cpp.o (symbol from plugin): in function `OCC::lcUtility()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/remotepermissions.cpp.o (symbol from plugin): in function `OCC::lcRemotePermissions()':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/vfs.cpp.o (symbol from plugin): in function `OCC::Vfs::Vfs(QObject*)':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/pinstate.cpp.o (symbol from plugin): in function `OCC::staticMetaObject':
(.text+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/nextcloud_csync.dir/nextcloud_csync_autogen/mocs_compilation.cpp.o (symbol from plugin):(.text+0x0): first defined here
/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/plugin.cpp.o (symbol from plugin): in function `OCC::PluginFactory::~PluginFactory()':
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/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/__/common/syncfilestatus.cpp.o (symbol from plugin): in function `OCC::SyncFileStatus::SyncFileStatus()':
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/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/std/c_time.cpp.o (symbol from plugin): in function `c_utimes(QString const&, timeval const*)':
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/usr/bin/ld: CMakeFiles/nextcloud_csync.dir/vio/csync_vio_local_unix.cpp.o (symbol from plugin): in function `lcCSyncVIOLocal()':
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make[4]: *** [src/csync/CMakeFiles/nextcloud_csync.dir/build.make:402: src/csync/libnextcloud_csync.so.3.15.2] Error 1
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dh_auto_build: error: cd obj-x86_64-linux-gnu && make -j8 "INSTALL=install --strip-program=true" VERBOSE=1 returned exit code 2
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