Dear maintainer,

During a test rebuild for CMake 4, xeus-gp failed to rebuild.

Log Summary:
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[...]
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dh_auto_configure: error: cd obj-aarch64-linux-gnu && DEB_PYTHON_INSTALL_LAYOUT=deb PKG_CONFIG=/usr/bin/pkg-config cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=None -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LOCALSTATEDIR=/var -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_FIND_USE_PACKAGE_REGISTRY=OFF -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON -DFETCHCONTENT_FULLY_DISCONNECTED=ON -DCMAKE_INSTALL_RUNSTATEDIR=/run -DCMAKE_SKIP_INSTALL_ALL_DEPENDENCY=ON "-GUnix Makefiles" -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_INSTALL_LIBDIR=lib/aarch64-linux-gnu -DCMAKE_SKIP_INSTALL_RPATH=ON .. returned exit code 1
make[1]: *** [debian/rules:9: override_dh_auto_configure] Error 2
make[1]: Leaving directory '/build/reproducible-path/xeus-gp-0.1.0'
make: *** [debian/rules:6: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
--------------------------------------------------------------------------------
Build finished at 2025-08-31T00:21:08Z
-------------------------------------------------------------------------------

The above is just how the build ends and not necessarily the most relevant part.
If required, the full build log is available here (for the next 30 days):
https://debusine.debian.net/artifact/2413863/

The most likely cause of build failures is the removed backwards compatibility for
CMake versions earlier than 3.5. You can find additional information in my
debian-devel announcement:

https://lists.debian.org/debian-devel/2025/04/msg00310.html

About the archive rebuild: The build was made on debusine.debian.net,
using sbuild.

You can find the build task here:
https://debusine.debian.net/work-request/155203/

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

Thanks,
Timo

I have downgraded the bug to non-RC severity temporarily and reverted
CMake in unstable to version 3.31.6. I plan to re-upgrade in about a
month's time. I realize that despite my April announcement, the upload
to unstable came rather surprising, and I don't want to cause
unnecessary pain.

Also, the build log URL has an unfortunate mistake. The correct URL
should include the workspace, i.e.,

https://debusine.debian.net/debian/developers/artifact/XXXX

CMake 4 will also be available in experimental again, so it can be
used to verify that the bug is fixed.

Cheers
Timo

Hello Timo, both URL returns error 404 so I cannot check the log.

Beside, most Xeus packages FTBFS currently anyway due to a bug in nlohmann-json3-dev,
see bug #1106511 and #1106446, so there is nothing I can do before nlohmann-json3-dev
is fixed.

Cheers,

Hello Bill,

* Bill Allombert <ballombe@debian.org> [2025-09-02 20:23]:
Did you get https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1113642#12
? Lee Garrett warned me that it might end up getting spam filtered
because it lacks a To header.

Anyway, the correct links should have been:
https://debusine.debian.net/debian/developers-roehling.cmake4/artifact/2413863/
https://debusine.debian.net/debian/developers-roehling.cmake4/work-request/155203/
I've looked at it, and I'm going to comment on that separately.


Cheers
Timo

Yes I get that email. It is not quite realistic to do transition during the
freeze and the release happened during the holyday, so I am not surprised it
did not work out.
  Could not find a configuration file for package "nlohmann_json" that
  exactly matches requested version "3.11.3".

  The following configuration files were considered but not accepted:

    /usr/share/cmake/nlohmann_json/nlohmann_jsonConfig.cmake, version: 3.12.0

so this is due to the nlohmann-json3-dev issue again.

Thanks!