Public bug reported:

dpkg-buildpackage
-----------------

Command: dpkg-buildpackage --sanitize-env -us -uc -mLaunchpad Build Daemon 
<[email protected]> -B -rfakeroot 
--changes-option=-O../libvirt-python_12.6.0-1_amd64v3.changes 
--buildinfo-option=-O../libvirt-python_12.6.0-1_amd64v3.buildinfo
dpkg-buildpackage: warning: passing -O via --changes-option is not supported; 
please use --changes-file instead
dpkg-buildpackage: warning: passing -O via --buildinfo-option is not supported; 
please use --buildinfo-file instead
dpkg-buildpackage: info: source package libvirt-python
dpkg-buildpackage: info: source version 12.6.0-1
dpkg-buildpackage: info: source distribution unstable
 dpkg-source --before-build .
 debian/rules clean
dh clean --buildsystem=pybuild
   dh_auto_clean -O--buildsystem=pybuild
   dh_autoreconf_clean -O--buildsystem=pybuild
   dh_clean -O--buildsystem=pybuild
 debian/rules binary-arch
dh binary-arch --buildsystem=pybuild
   dh_update_autotools_config -a -O--buildsystem=pybuild
   dh_autoreconf -a -O--buildsystem=pybuild
   dh_auto_configure -a -O--buildsystem=pybuild
   dh_auto_build -a -O--buildsystem=pybuild
I: pybuild plugin_pyproject:142: Building wheel for python3.14 with "build" 
module
I: pybuild base:385: python3.14 -m build --skip-dependency-check --no-isolation 
--wheel --outdir /<<PKGBUILDDIR>>/.pybuild/cpython3_3.14  
* Building wheel...
running bdist_wheel
running build
running build_py
creating build/lib.linux-x86_64-cpython-314
copying build/libvirt.py -> build/lib.linux-x86_64-cpython-314
copying build/libvirt_qemu.py -> build/lib.linux-x86_64-cpython-314
copying build/libvirt_lxc.py -> build/lib.linux-x86_64-cpython-314
copying build/libvirtaio.py -> build/lib.linux-x86_64-cpython-314
running build_ext
Generated 287 wrapper functions
Generated 1 wrapper functions
Generated 1 wrapper functions
building 'libvirtmod' extension
creating build/temp.linux-x86_64-cpython-314/build
building 'libvirtmod_qemu' extension
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
build/libvirt-qemu.c -o 
build/temp.linux-x86_64-cpython-314/build/libvirt-qemu.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
build/libvirt.c -o build/temp.linux-x86_64-cpython-314/build/libvirt.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
building 'libvirtmod_lxc' extension
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
build/libvirt-lxc.c -o build/temp.linux-x86_64-cpython-314/build/libvirt-lxc.o 
-Ibuild -Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
libvirt-lxc-override.c -o 
build/temp.linux-x86_64-cpython-314/libvirt-lxc-override.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
libvirt-qemu-override.c -o 
build/temp.linux-x86_64-cpython-314/libvirt-qemu-override.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
libvirt-utils.c -o build/temp.linux-x86_64-cpython-314/libvirt-utils.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
libvirt-utils.c -o build/temp.linux-x86_64-cpython-314/libvirt-utils.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
typewrappers.c -o build/temp.linux-x86_64-cpython-314/typewrappers.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
typewrappers.c -o build/temp.linux-x86_64-cpython-314/typewrappers.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -shared -Wl,-O1 -Wl,-Bsymbolic-functions 
-Wl,-Bsymbolic-functions 
-Wl,--package-metadata=%7B%22type%22:%22deb%22%2C%22os%22:%22ubuntu%22%2C%22name%22:%22python3.14%22%2C%22version%22:%223.14.6-1%22%2C%22architecture%22:%22amd64%22%2C%22architectureVariant%22:%22amd64v3%22%7D
 -Wl,-z,relro -march=x86-64-v3 -g -fwrapv -O2 -Wl,-Bsymbolic-functions 
-Wl,--package-metadata=%7B%22type%22:%22deb%22%2C%22os%22:%22ubuntu%22%2C%22name%22:%22libvirt-python%22%2C%22version%22:%2212.6.0-1%22%2C%22architecture%22:%22amd64%22%2C%22architectureVariant%22:%22amd64v3%22%7D
 -flto=auto -ffat-lto-objects -Wl,-z,relro -Wl,-z,now -march=x86-64-v3 -g -O2 
-Werror=implicit-function-declaration -fno-omit-frame-pointer 
-mno-omit-leaf-frame-pointer -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto 
-ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 
build/temp.linux-x86_64-cpython-314/build/libvirt-lxc.o 
build/temp.linux-x86_64-cpython-314/libvirt-lxc-override.o 
build/temp.linux-x86_64-cpython-314/libvirt-utils.o 
build/temp.linux-x86_64-cpython-314/typewrappers.o -L/usr/lib/x86_64-linux-gnu 
-lvirt-lxc -lvirt -o 
build/lib.linux-x86_64-cpython-314/libvirtmod_lxc.cpython-314-x86_64-linux-gnu.so
lto1: error: build/temp.linux-x86_64-cpython-314/typewrappers.o: file too short
lto1: fatal error: errors during merging of translation units
compilation terminated.
lto-wrapper: fatal error: /usr/bin/x86_64-linux-gnu-gcc returned 1 exit status
compilation terminated.
/usr/bin/x86_64-linux-gnu-ld.bfd: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
x86_64-linux-gnu-gcc -shared -Wl,-O1 -Wl,-Bsymbolic-functions 
-Wl,-Bsymbolic-functions 
-Wl,--package-metadata=%7B%22type%22:%22deb%22%2C%22os%22:%22ubuntu%22%2C%22name%22:%22python3.14%22%2C%22version%22:%223.14.6-1%22%2C%22architecture%22:%22amd64%22%2C%22architectureVariant%22:%22amd64v3%22%7D
 -Wl,-z,relro -march=x86-64-v3 -g -fwrapv -O2 -Wl,-Bsymbolic-functions 
-Wl,--package-metadata=%7B%22type%22:%22deb%22%2C%22os%22:%22ubuntu%22%2C%22name%22:%22libvirt-python%22%2C%22version%22:%2212.6.0-1%22%2C%22architecture%22:%22amd64%22%2C%22architectureVariant%22:%22amd64v3%22%7D
 -flto=auto -ffat-lto-objects -Wl,-z,relro -Wl,-z,now -march=x86-64-v3 -g -O2 
-Werror=implicit-function-declaration -fno-omit-frame-pointer 
-mno-omit-leaf-frame-pointer -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto 
-ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 
build/temp.linux-x86_64-cpython-314/build/libvirt-qemu.o 
build/temp.linux-x86_64-cpython-314/libvirt-qemu-override.o 
build/temp.linux-x86_64-cpython-314/libvirt-utils.o 
build/temp.linux-x86_64-cpython-314/typewrappers.o -L/usr/lib/x86_64-linux-gnu 
-lvirt-qemu -lvirt -o 
build/lib.linux-x86_64-cpython-314/libvirtmod_qemu.cpython-314-x86_64-linux-gnu.so
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
libvirt-override.c -o build/temp.linux-x86_64-cpython-314/libvirt-override.o 
-Ibuild -Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
libvirt-utils.c -o build/temp.linux-x86_64-cpython-314/libvirt-utils.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects 
-fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 -fPIC -I. -I/usr/include/python3.14 -c 
typewrappers.c -o build/temp.linux-x86_64-cpython-314/typewrappers.o -Ibuild 
-Wp,-DPy_LIMITED_API=0x03060000
x86_64-linux-gnu-gcc -shared -Wl,-O1 -Wl,-Bsymbolic-functions 
-Wl,-Bsymbolic-functions 
-Wl,--package-metadata=%7B%22type%22:%22deb%22%2C%22os%22:%22ubuntu%22%2C%22name%22:%22python3.14%22%2C%22version%22:%223.14.6-1%22%2C%22architecture%22:%22amd64%22%2C%22architectureVariant%22:%22amd64v3%22%7D
 -Wl,-z,relro -march=x86-64-v3 -g -fwrapv -O2 -Wl,-Bsymbolic-functions 
-Wl,--package-metadata=%7B%22type%22:%22deb%22%2C%22os%22:%22ubuntu%22%2C%22name%22:%22libvirt-python%22%2C%22version%22:%2212.6.0-1%22%2C%22architecture%22:%22amd64%22%2C%22architectureVariant%22:%22amd64v3%22%7D
 -flto=auto -ffat-lto-objects -Wl,-z,relro -Wl,-z,now -march=x86-64-v3 -g -O2 
-Werror=implicit-function-declaration -fno-omit-frame-pointer 
-mno-omit-leaf-frame-pointer -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto 
-ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat 
-Werror=format-security -fcf-protection -march=x86-64-v3 
-fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/libvirt-python-12.6.0-1 
-Wdate-time -D_FORTIFY_SOURCE=3 
build/temp.linux-x86_64-cpython-314/build/libvirt.o 
build/temp.linux-x86_64-cpython-314/libvirt-override.o 
build/temp.linux-x86_64-cpython-314/libvirt-utils.o 
build/temp.linux-x86_64-cpython-314/typewrappers.o -L/usr/lib/x86_64-linux-gnu 
-lvirt -o 
build/lib.linux-x86_64-cpython-314/libvirtmod.cpython-314-x86_64-linux-gnu.so
error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1

TIP pass --env-dir and --sdist-extract-dir to keep the build environment and 
sources, then see 
https://build.pypa.io/en/stable/how-to/troubleshooting.html#debug-a-failed-build
 for help debugging a failed build
ERROR Backend subprocess exited when trying to invoke build_wheel
E: pybuild pybuild:485: build: plugin pyproject failed with: exit code=1: 
python3.14 -m build --skip-dependency-check --no-isolation --wheel --outdir 
/<<PKGBUILDDIR>>/.pybuild/cpython3_3.14  
dh_auto_build: error: pybuild --build -i python{version} -p 3.14 --parallel=4 
returned exit code 13
make: *** [debian/rules:12: binary-arch] Error 25
dpkg-buildpackage: error: debian/rules binary-arch subprocess failed with exit 
status 2
--------------------------------------------------------------------------------
Build finished at 2026-08-06T11:19:24Z


[1] 
https://launchpadlibrarian.net/872450542/buildlog_ubuntu-stonking-amd64v3.libvirt-python_12.6.0-1_BUILDING.txt.gz

** Affects: libvirt-python (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ftbfs

** Tags added: ftbfs

-- 
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https://bugs.launchpad.net/bugs/2163684

Title:
  ftbfs on amd64v3 for Ubuntu Stonking

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