Bug#1097967: tanglet: ftbfs with GCC-15

[Matthias Klose]

Package: src:tanglet
Version: 1.6.6-1
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/tanglet_1.6.6-1_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

[...]
[ 75%] Building CXX object CMakeFiles/tanglet.dir/src/gzip.cpp.o
[ 78%] Building CXX object CMakeFiles/tanglet.dir/src/clock.cpp.o
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[ 96%] Building CXX object CMakeFiles/tanglet.dir/tanglet_autogen/2SEMU33LXP/qrc_icons.cpp.o
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[ 97%] Building CXX object CMakeFiles/tanglet.dir/tanglet_autogen/2SEMU33LXP/qrc_icon.cpp.o
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[ 98%] Linking CXX executable tanglet
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/usr/bin/ld: CMakeFiles/tanglet.dir/src/board.cpp.o:(.rodata+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/tanglet.dir/tanglet_autogen/mocs_compilation.cpp.o:(.rodata+0x1264): first defined here
/usr/bin/ld: CMakeFiles/tanglet.dir/src/clock.cpp.o:(.rodata+0x20): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/tanglet.dir/tanglet_autogen/mocs_compilation.cpp.o:(.rodata+0x1264): first defined here
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/usr/bin/ld: CMakeFiles/tanglet.dir/src/language_settings.cpp.o:(.rodata+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/tanglet.dir/tanglet_autogen/mocs_compilation.cpp.o:(.rodata+0x1264): first defined here
/usr/bin/ld: CMakeFiles/tanglet.dir/src/locale_dialog.cpp.o:(.rodata+0x0): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/tanglet.dir/tanglet_autogen/mocs_compilation.cpp.o:(.rodata+0x1264): first defined here
/usr/bin/ld: CMakeFiles/tanglet.dir/src/letter.cpp.o:(.rodata+0x20): multiple definition of `QtPrivate::IsFloatType_v<_Float16>'; CMakeFiles/tanglet.dir/tanglet_autogen/mocs_compilation.cpp.o:(.rodata+0x1264): first defined here
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make[3]: *** [CMakeFiles/tanglet.dir/build.make:606: tanglet] Error 1
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