Dear maintainer:

During a rebuild of all packages in unstable, your package failed to build:
--------------------------------------------------------------------------------
[...]
 debian/rules clean
dh clean
   dh_clean
 debian/rules binary
dh binary
   dh_update_autotools_config
   dh_autoreconf
   debian/rules override_dh_auto_configure
make[1]: Entering directory '/<<PKGBUILDDIR>>'
dh_auto_configure -- -DCMAKE_SKIP_INSTALL_RPATH=ON
	cd obj-x86_64-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/x86_64-linux-gnu -DCMAKE_SKIP_INSTALL_RPATH=ON ..
-- The C compiler identification is GNU 14.2.0
-- The CXX compiler identification is GNU 14.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Building xeus-gp v0.1.0
CMake Error at /usr/share/cmake-3.31/Modules/CMakeFindDependencyMacro.cmake:76 (find_package):
  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

Call Stack (most recent call first):
  /usr/lib/x86_64-linux-gnu/cmake/xeus/xeusConfig.cmake:61 (find_dependency)
  CMakeLists.txt:71 (find_package)

Hello Santiago,

nlohmann-json3-dev has a well-known upstream bug that causes it to breaks the
ABI with each minor version, see for example:

xeus (3.1.3-2) unstable; urgency=medium

  * d/control: build-depend on nlohmann-json3-dev 3.11.3
    The API of this library exposes types from nlohmann::json, and this
    resulted in an ABI change depending on whether libxeus and the kernel
    are built against 3.11.2 or 3.11.3. This adds an explicit dependency
    on nlohmann-json3-dev 3.11.3. This explicitly chooses the newer version
    for libxeus and dependencies. (Closes: #1060164, #1061007)

El 24/5/25 a las 19:42, Bill Allombert escribió:

I am also unsure about what to do. Gianfranco, can you please comment on this?

Note that the three bugs against xeus-* which I reported today are the only ones
of this type which I found after building all packages in unstable, so adapting
to the new nlohmann would not be a very bad option.

[ But someone should probably talk with Release Managers and explain this,
as I am just a bug reporter... ]

Thanks.

Thanks!
I would really like to see the buildlog for xeus itself, if you have it.

Cheers,

El 26/5/25 a las 9:19, Bill Allombert escribió:

Ok, yes, I have it. It was successful, I've just put it here as well:

https://people.debian.org/~sanvila/build-logs/202505/

Thanks.

Hi,

It seems the xeus-* packages build fine in trixie.

I added version information to these bugs, to make it clear they only affect
the version in unstable.

Cheers,

Ivo

We believe that the bug you reported is fixed in the latest version of
nlohmann-json3, 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 1106446@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Bill Allombert <ballombe@debian.org> (supplier of updated nlohmann-json3 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: Fri, 12 Sep 2025 17:36:08 +0200
Source: nlohmann-json3
Architecture: source
Version: 3.12.0.really.3.11.3-0.1
Distribution: unstable
Urgency: medium
Maintainer: Hubert Chathi <uhoreg@debian.org>
Changed-By: Bill Allombert <ballombe@debian.org>
Closes: 1106446 1106447 1106448 1110784 1110787 1110805 1111390
Changes:
 nlohmann-json3 (3.12.0.really.3.11.3-0.1) unstable; urgency=medium
 .
   * Non-maintainer upload. (Closes: #1111390)
   * Revert to 3.11.3 to restore ABI.
     (Closes: #1106446, #1106447, #1106448, #1110784, #1110787, #1110805)
   * Any new upstream version need to use a versioned source package name
     to be coinstallable with the versions providing the ABI used by existing
     shared libraries using nlohmann-json3, see #1106511.
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