Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202606/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:deal.ii, so that this is still
visible in the BTS web page for this package.

Thanks.
--------------------------------------------------------------------------------
[...]
[100%] Building CXX object source/CMakeFiles/dealii_debug.dir/dummy.cc.o
cd /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/source && /usr/bin/ [too-long-redacted] <<PKGBUILDDIR>>/source/dummy.cc
[100%] Linking CXX shared library ../lib/x86_64-linux-gnu/libdeal.ii.g.so
cd /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/source && /usr/bin/cmake -E cmake_link_script CMakeFiles/dealii_debug.dir/link.txt --verbose=1
/usr/bin/x86_64-linux-gnu-g++ -fPIC -shared -rdynamic -fuse- [too-long-redacted] : string is not null terminated
collect2: error: ld returned 1 exit status
ersTexture-9.5.so.9.5 /usr/lib/x86_64-linux-gnu/libvtkFilter [too-long-redacted] linux-gnu/openmpi/lib/libmpi.so
make[3]: *** [source/CMakeFiles/dealii_debug.dir/build.make:1232: lib/x86_64-linux-gnu/libdeal.ii.g.so.9.7.1] Error 1
make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
make[2]: *** [CMakeFiles/Makefile2:4952: source/CMakeFiles/dealii_debug.dir/all] Error 2
make[2]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
[100%] Built target object_non_matching_release
make[2]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
make[1]: *** [Makefile:139: all] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>/obj-x86_64-linux-gnu'
dh_auto_build: error: cd obj-x86_64-linux-gnu && make -j2 INSTALL="install --strip-program=true" VERBOSE=1 returned exit code 2
make: *** [debian/rules:16: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
--------------------------------------------------------------------------------

It seems that "mold" is causing this issue. When switching back to the
normal linker, the package builds.

I'm cloning this bug and assign the cloned one to mold,
The fix for deal.ii will be to drop the B-D on mold for the moment.

We believe that the bug you reported is fixed in the latest version of
deal.ii, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1140247@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Tobias Frost <tobi@debian.org> (supplier of updated deal.ii package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 05 Sep 2026 16:31:49 +0200
Source: deal.ii
Architecture: source
Version: 9.7.1-7
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Tobias Frost <tobi@debian.org>
Closes: 1140247
Changes:
 deal.ii (9.7.1-7) unstable; urgency=medium
 .
   * Team upload.
   * d/watch: Mangle upstream version to properly handle -rc versions.
   * Drop B-D and Depends on mold, as it causes an FTBFS. Closes: #1140247.
Checksums-Sha1:
 3b0bf04936a506527583ce7271abcaec1556035a 2784 deal.ii_9.7.1-7.dsc
 edefd432a4f4c6d866d69db2c82657904bb5b8cd 15152 deal.ii_9.7.1-7.debian.tar.xz
 a0853cc7659d59c4f14e0c25369a96095169e59d 14938 deal.ii_9.7.1-7_source.buildinfo
Checksums-Sha256:
 ff53e6d4f528e5d4b142e34f524524dd95555e354e498b4a5101929dc7a18eaa 2784 deal.ii_9.7.1-7.dsc
 5c8ff739a68a5ccf1e8f087ae89222d33e9616d910aa3836a1b598a7f24932b6 15152 deal.ii_9.7.1-7.debian.tar.xz
 3ec183598e8d20499d4d6dcaebc7481b5ced4a0de1041feeccab3b1b219f9de6 14938 deal.ii_9.7.1-7_source.buildinfo
Files:
 124481b282ad635c7084b9b50ef6d965 2784 libs optional deal.ii_9.7.1-7.dsc
 56f497f0c7c568c978749b72b55dd35e 15152 libs optional deal.ii_9.7.1-7.debian.tar.xz
 9739dfdb60ce6592afd545e6d1170108 14938 libs optional deal.ii_9.7.1-7_source.buildinfo
-----BEGIN PGP SIGNATURE-----

iQIzBAEBCgAdFiEE/d0M/zhkJ3YwohhskWT6HRe9XTYFAmqcKHwACgkQkWT6HRe9
XTbT1w/9E2BJTI5b7f8HULstm3VfES4FFJc95gUVjmKzoJrHiqcANgkmTOJutuQ2
KoMYaowtUXtmdXI6dGlaokcZ+uhXgeeiQy1W7H9imXIWdytpNAKSCmHMDZQijgJG
mOwzrl5f+SGSGjkFbenH6B4bjhIDk1e2PxU9V9F5atfVWgYQvSAeMhUX/JM19IJc
a/HHe3CI5BMvG6eFeoqDzfaHcnAafOikwdEQeQsKaciaQnefGqwv37JBj+UUlE7O
+7n4zyzTsUOWdufi/yU+uFm5BTLzsNLhl6mTm7oK5g1hrubM6cJBK0yfGkgVYCLj
+31Xrsu9YDdk7NIX9jcmGH5BQOL5E1bDsbqSWqqh4UCKZbz2kx3NwtpEm/91pJgL
JB9895f6Ze/0vx323nlBXMvLiomEcVXk5XBWvHqXL1GNKLfgNS1Vv0m5ASbbSrfd
OHmyW7oHwieoxXuzRzCvXVw1n1Bv92uI++yhuNiDJG2u5pq1EFJqH+J6B4v5AoTF
QIyjEvp7yM4RwPE4t43JZ1+bRooxMAnfV9xasaqj/0ItExW+jT50PSqFdEYngsLw
+BMCUQocB8tyPEbUVjgpfLlfzP7NX2xTQi3oEAbWxnfgvSIaQdEuMg2lAuC5Wtd5
r+0L3/o+bsCwWHAdPEJBGjxsKnWwbyE7cwfmQLzZC876rfYYKws=
=F8Ll
-----END PGP SIGNATURE-----

Hi Tobi,
just an FYI on this. I am not very much involved in this package, except for
having made a couple of uploads when it was blocking the migration of other
packages.

We have had this mold "dance" already in the recent past.
First, 9.6.2-2 added it, and 9.7.1-2 removed it.
Afterwards, 9.7.1-3 added it back, and 9.7.1-7 (latest) removed it again.

Just leaving this written here for posterity in case there is a third round ;)

Cheers,
Francesco