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Date: Mon, 13 Apr 2026 15:12:32 +0200
From: Emanuele Rocca &lt;ema@debian.org&gt;
To: maintonly@bugs.debian.org
Subject: votca: ftbfs with GCC-16
Message-ID: &lt;adzrwLvlgT871r5x@ariel.home&gt;
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X-Debian-User: ema
Delivered-To: maintonly@bugs.debian.org

Package: src:votca
Version: 2025.1-2
Severity: important
Tags: sid forky ftbfs
User: debian-gcc@lists.debian.org
Usertags: ftbfs-gcc-16

Hi,

votca fails to build in a test rebuild on at least amd64 and arm64 with
gcc-16/g++-16, but builds properly with gcc-15/g++-15. The severity of this
report will be raised before the forky release.

The full build log can be found at:
https://people.debian.org/~ema/gcc-16-rebuilds/output-1/votca_arm64.build.xz

The last lines of the build log are at the end of this report.

To build with GCC 16, either set CC=3Dgcc-16 CXX=3Dg++-16 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=3Dexperimental install g++=20

Common build failures include unused (but set) variables, array subscripts
partly outside array bounds, and new/dropped symbols in Debian symbols file=
s.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-16/porting_to.html

Please only close this issue after double-checking that the package can be
built correctly with GCC 16.

Please do not reassign this bug to another package. If a fix in another pac=
kage
is required, then file a bug for the other package (or clone), and mark this
bug as blocked by the bug in the other package.

[...]


cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/test=
s &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/unit_test_bead.dir/link=
=2Etxt --verbose=3D1
/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
=2E1=3D. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=
=3Dformat-security -mbranch-protection=3Dstandard -Wdate-time -D_FORTIFY_SO=
URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/part_dist.dir/link.d CMakeFiles/par=
t_dist.dir/part_dist/part_dist.cc.o -o part_dist/csg_part_dist  -Wl,-rpath,=
/build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:=
/build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libto=
ols: ../libcsg/libvotca_csg.so.2025 ../../../tools/src/libtools/libvotca_to=
ols.so.2025 /usr/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-g=
nu/libboost_program_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_c=
ontainer.so.1.90.0 /usr/lib/gcc/aarch64-linux-gnu/16/libgomp.so /usr/lib/aa=
rch64-linux-gnu/libpthread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
[ 64%] Built target part_dist
[ 64%] Linking CXX executable partial_rdf/csg_partial_rdf
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/csga=
pps &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/partial_rdf.dir/link.=
txt --verbose=3D1
/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
=2E1=3D. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=
=3Dformat-security -mbranch-protection=3Dstandard -Wdate-time -D_FORTIFY_SO=
URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/unit_test_bead.dir/link.d CMakeFile=
s/unit_test_bead.dir/test_bead.cc.o -o unit_test_bead  -Wl,-rpath,/build/re=
producible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:/build/re=
producible-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libtools ../li=
bcsg/libvotca_csg.so.2025 /usr/lib/aarch64-linux-gnu/libboost_unit_test_fra=
mework.so.1.90.0 ../../../tools/src/libtools/libvotca_tools.so.2025 /usr/li=
b/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-gnu/libboost_program=
_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_container.so.1.90.0 =
/usr/lib/gcc/aarch64-linux-gnu/16/libgomp.so /usr/lib/aarch64-linux-gnu/lib=
pthread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
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[ 64%] Built target unit_test_bead
[ 64%] Linking CXX executable unit_test_lammpsdumpreaderwriter
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/test=
s &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/unit_test_lammpsdumprea=
derwriter.dir/link.txt --verbose=3D1
/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
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=3Dformat-security -mbranch-protection=3Dstandard -Wdate-time -D_FORTIFY_SO=
URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/partial_rdf.dir/link.d CMakeFiles/p=
artial_rdf.dir/partial_rdf/partial_rdf.cc.o CMakeFiles/partial_rdf.dir/part=
ial_rdf/rdf_calculator.cc.o -o partial_rdf/csg_partial_rdf  -Wl,-rpath,/bui=
ld/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:/bui=
ld/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libtools:=
 ../libcsg/libvotca_csg.so.2025 ../../../tools/src/libtools/libvotca_tools.=
so.2025 /usr/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-gnu/l=
ibboost_program_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_conta=
iner.so.1.90.0 /usr/lib/gcc/aarch64-linux-gnu/16/libgomp.so /usr/lib/aarch6=
4-linux-gnu/libpthread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
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[ 64%] Built target partial_rdf
/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
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URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/unit_test_lammpsdumpreaderwriter.di=
r/link.d CMakeFiles/unit_test_lammpsdumpreaderwriter.dir/test_lammpsdumprea=
derwriter.cc.o -o unit_test_lammpsdumpreaderwriter  -Wl,-rpath,/build/repro=
ducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:/build/repro=
ducible-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libtools ../libcs=
g/libvotca_csg.so.2025 /usr/lib/aarch64-linux-gnu/libboost_unit_test_framew=
ork.so.1.90.0 ../../../tools/src/libtools/libvotca_tools.so.2025 /usr/lib/a=
arch64-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-gnu/libboost_program_op=
tions.so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_container.so.1.90.0 /us=
r/lib/gcc/aarch64-linux-gnu/16/libgomp.so /usr/lib/aarch64-linux-gnu/libpth=
read.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
[ 64%] Built target unit_test_lammpsdumpreaderwriter
[ 64%] Linking CXX executable orientcorr/csg_orientcorr
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/csga=
pps &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/orientcorr.dir/link.t=
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[ 64%] Linking CXX executable unit_test_interaction
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/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
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URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/orientcorr.dir/link.d CMakeFiles/or=
ientcorr.dir/orientcorr/orientcorr.cc.o -o orientcorr/csg_orientcorr  -Wl,-=
rpath,/build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/l=
ibcsg:/build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src=
/libtools: ../libcsg/libvotca_csg.so.2025 ../../../tools/src/libtools/libvo=
tca_tools.so.2025 /usr/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch64-l=
inux-gnu/libboost_program_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/libb=
oost_container.so.1.90.0 /usr/lib/gcc/aarch64-linux-gnu/16/libgomp.so /usr/=
lib/aarch64-linux-gnu/libpthread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
[ 64%] Built target orientcorr
/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
=2E1=3D. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=
=3Dformat-security -mbranch-protection=3Dstandard -Wdate-time -D_FORTIFY_SO=
URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/unit_test_interaction.dir/link.d CM=
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action  -Wl,-rpath,/build/reproducible-path/votca-2025.1/obj-aarch64-linux-=
gnu/csg/src/libcsg:/build/reproducible-path/votca-2025.1/obj-aarch64-linux-=
gnu/tools/src/libtools ../libcsg/libvotca_csg.so.2025 /usr/lib/aarch64-linu=
x-gnu/libboost_unit_test_framework.so.1.90.0 ../../../tools/src/libtools/li=
bvotca_tools.so.2025 /usr/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch6=
4-linux-gnu/libboost_program_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/l=
ibboost_container.so.1.90.0 /usr/lib/gcc/aarch64-linux-gnu/16/libgomp.so /u=
sr/lib/aarch64-linux-gnu/libpthread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
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[ 64%] Built target unit_test_interaction
[ 66%] Linking CXX executable unit_test_beadmotif_algorithms
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/test=
s &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/unit_test_beadmotif_alg=
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[ 66%] Linking CXX executable csg_density
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/tool=
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t --verbose=3D1
/usr/bin/c++ -g -O2 -ffile-prefix-map=3D/build/reproducible-path/votca-2025=
=2E1=3D. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=
=3Dformat-security -mbranch-protection=3Dstandard -Wdate-time -D_FORTIFY_SO=
URCE=3D2 -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wl,-z,relro -Wl,-z=
,now -Wl,--dependency-file=3DCMakeFiles/unit_test_beadmotif_algorithms.dir/=
link.d CMakeFiles/unit_test_beadmotif_algorithms.dir/test_beadmotif_algorit=
hms.cc.o -o unit_test_beadmotif_algorithms  -Wl,-rpath,/build/reproducible-=
path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:/build/reproducible-=
path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libtools ../libcsg/libvot=
ca_csg.so.2025 /usr/lib/aarch64-linux-gnu/libboost_unit_test_framework.so.1=
=2E90.0 ../../../tools/src/libtools/libvotca_tools.so.2025 /usr/lib/aarch64=
-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-gnu/libboost_program_options.=
so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_container.so.1.90.0 /usr/lib/=
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sg_density.dir/csg_density.cc.o -o csg_density  -Wl,-rpath,/build/reproduci=
ble-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:/build/reproduci=
ble-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libtools: ../libcsg/l=
ibvotca_csg.so.2025 ../../../tools/src/libtools/libvotca_tools.so.2025 /usr=
/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-gnu/libboost_prog=
ram_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_container.so.1.90=
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[ 66%] Linking CXX executable csg_stat
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ools/src/libtools: ../libcsg/libvotca_csg.so.2025 ../../../tools/src/libtoo=
ls/libvotca_tools.so.2025 /usr/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/a=
arch64-linux-gnu/libboost_program_options.so.1.90.0 /usr/lib/aarch64-linux-=
gnu/libboost_container.so.1.90.0 /usr/lib/gcc/aarch64-linux-gnu/16/libgomp.=
so /usr/lib/aarch64-linux-gnu/libpthread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
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[ 66%] Linking CXX executable csg_reupdate
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ducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/libcsg:/build/repro=
ducible-path/votca-2025.1/obj-aarch64-linux-gnu/tools/src/libtools: ../libc=
sg/libvotca_csg.so.2025 ../../../tools/src/libtools/libvotca_tools.so.2025 =
/usr/lib/aarch64-linux-gnu/libfftw3.so /usr/lib/aarch64-linux-gnu/libboost_=
program_options.so.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_container.so.=
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make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
[ 66%] Built target csg_imc_solve
[ 66%] Linking CXX executable csg_fmatch
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/csg/src/tool=
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usr/lib/gcc/aarch64-linux-gnu/16/libgomp.so /usr/lib/aarch64-linux-gnu/libp=
thread.a
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
[ 66%] Built target csg_fmatch
[ 66%] Linking CXX shared library libvotca_xtp.so
cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/xtp/src/libx=
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ch64-linux-gnu/tools/src/libtools:/usr/lib/aarch64-linux-gnu/hdf5/serial: .=
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x-gnu/libxc.a /usr/lib/aarch64-linux-gnu/libint2.so.2.0.4 /usr/lib/aarch64-=
linux-gnu/libecpint.a /usr/lib/aarch64-linux-gnu/libboost_program_options.s=
o.1.90.0 /usr/lib/aarch64-linux-gnu/libboost_timer.so.1.90.0 /usr/lib/aarch=
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cd /build/reproducible-path/votca-2025.1/obj-aarch64-linux-gnu/xtp/src/libx=
tp &amp;&amp; /usr/bin/cmake -E cmake_symlink_library libvotca_xtp.so.2025 libvotca=
_xtp.so.2025 libvotca_xtp.so
make[4]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
[ 66%] Built target votca_xtp
make[3]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
make[2]: *** [Makefile:149: all] Error 2
make[2]: Leaving directory '/build/reproducible-path/votca-2025.1/obj-aarch=
64-linux-gnu'
dh_auto_build: error: cd obj-aarch64-linux-gnu &amp;&amp; make -j128 INSTALL=3D&quot;ins=
tall --strip-program=3Dtrue&quot; VERBOSE=3D1 returned exit code 2
make[1]: *** [debian/rules:31: override_dh_auto_build-indep] Error 25
make[1]: Leaving directory '/build/reproducible-path/votca-2025.1'
make: *** [debian/rules:50: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit s=
tatus 2
]