Hi Maintainer

As per Debian policy 8.1 Shared Libraries [1]:

The run-time shared library must be placed in a package whose name
changes whenever the SONAME of the shared library changes.

This was not done in the 0.2.11-1 upload (and also not in the 0.2.7-1 upload).

The effect can be seen in the autopkgtest regression of jsonnet in
testing [2].  I have copied part of the log below.

Regards
Graham


[1] https://www.debian.org/doc/debian-policy/ch-sharedlibs.html#run-time-shared-libraries
[2] https://ci.debian.net/packages/j/jsonnet/testing/amd64/


 32s autopkgtest [09:44:27]: test command1: DISABLE_LIB_TESTS=1
JSONNET_BIN=/usr/bin/jsonnet JSONNETFMT_BIN=/usr/bin/jsonnetfmt sh
tests.sh
 32s autopkgtest [09:44:27]: test command1: [-----------------------
 32s snippet: /usr/bin/jsonnet: error while loading shared libraries:
libc4core.so.0.2.7: cannot open shared object file: No such file or
directory
 32s  [31;1mFAIL [0m  [1m(exit code) [0m:  [36m/usr/bin/jsonnet
--ext-str prefix='Happy Hour ' --ext-code brunch=true --tla-str
prefix='Happy Hour ' --tla-code brunch=true .//arith.jsonnet [0m
 32s This run's output:
 32s /usr/bin/jsonnet: error while loading shared libraries:
libc4core.so.0.2.7: cannot open shared object file: No such file or
directory
 32s Actual exit code 127, expected 0

Hi Graham,

The situation with rapidyaml mirrors c4core exactly.
The package name `libryml0` is correct per Debian Policy 8.1 — it must
track the embedded ELF SONAME (`libryml.so.0`), not the full versioned
filename on disk.
A CMake patch setting `SOVERSION` to the major version (as done in
Gabriel's MR [0]) ensures a stable SONAME while allowing the on-disk
library to be `libryml.so.0.11.1`.
This keeps everything consistent without unnecessary transitions:

* Versioned filename: libryml.so.0.11.1
* SONAME symlink: libryml.so.0 => libryml.so.0.11.1
* Binary package: libryml0

Renaming the runtime package on every upstream release (e.g. to
`libryml0.11.1`) would technically satisfy the policy but would create
excessive churn during the 0.x series, even when there is no ABI
break.

This bug should be closed unless new evidence of an actual SONAME
change emerges.

[0] https://salsa.debian.org/debian/rapidyaml/-/merge_requests/1

Regards,
Fukui

This is not true.

The ELF SONAME of libryml is:

$ objdump -p /usr/lib/x86_64-linux-gnu/libryml.so.0.10.0 | grep SONAME
  SONAME               libryml.so.0.10.0
$

cu
Adrian

Adrian,

[0] https://salsa.debian.org/debian/rapidyaml/-/merge_requests/1

to properly have it fix on version 0.11.1-1.

root@e17657d36880:~/rapidyaml# dpkg -s libryml0 | grep Version
Version: 0.11.1+ds-1
root@e17657d36880:~/rapidyaml# readelf -d /usr/lib/x86_64-linux-gnu/libryml.so.0.11.1 | grep SONAME
0x000000000000000e (SONAME)             Library soname: [libryml.so.0]
root@e17657d36880:~/rapidyaml#

Daichi, thanks a lot for following a long this issue.

Gabriel

Does upstream guarantee ABI stability between releases?

If upstream does not make such guarantees, then the upstream soname is
correct and there has to be a library transition for every new upstream
version.

cu
Adrian

We believe that the bug you reported is fixed in the latest version of
rapidyaml, 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 1134119@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Gabriel Barrantes <gabriel.barrantes.dev@outlook.com> (supplier of updated rapidyaml 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: Sun, 26 Apr 2026 17:37:23 +0000
Source: rapidyaml
Architecture: source
Version: 0.11.1+ds-1
Distribution: unstable
Urgency: medium
Maintainer: Gabriel Barrantes <gabriel.barrantes.dev@outlook.com>
Changed-By: Gabriel Barrantes <gabriel.barrantes.dev@outlook.com>
Closes: 1134119
Changes:
 rapidyaml (0.11.1+ds-1) unstable; urgency=medium
 .
   * New upstream version
   * debian/patches:
     - Add patch to allow coinstall
     - Set proper soversion (Closes: #1134119)
     - Add missing includes to resolve compilation warnings
   * debian/gbp.conf:
     - Create config file
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Please fix the SONAME and rename the library package, as was done in c4core [1].


[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1134117#49

The Debian NEW review of rapidyaml 0.16.0+ds-1 has been completed.

Decision: ACCEPTED
Reviewer: Andrew McMillan

Full review details: https://dfsg-new-queue.debian.org/reviews/rapidyaml

We believe that the bug you reported is fixed in the latest version of
rapidyaml, 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 1134119@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Sébastien Noel <twolife@debian.org> (supplier of updated rapidyaml 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 10:13:45 +0200
Source: rapidyaml
Binary: libryml-dev libryml0.16 libryml0.16-dbgsym
Architecture: source amd64
Version: 0.16.0+ds-1
Distribution: experimental
Urgency: medium
Maintainer: Gabriel Barrantes <gabriel.barrantes.dev@outlook.com>
Changed-By: Sébastien Noel <twolife@debian.org>
Description:
 libryml-dev - C++ library to parse and emit YAML (development files)
 libryml0.16 - C++ library to parse and emit YAML
Closes: 1134119 1146272
Changes:
 rapidyaml (0.16.0+ds-1) experimental; urgency=medium
 .
   * Team upload
   * New upstream release
     + Fix FTBFS (Closes: #1146272)
     + Drop obsolete patches
   * Rename the library package to match SONAME (Closes: #1134119)
   * Mark packages as 'Multi-Arch: same'
   * Bump S-V to 4.7.4: remove 'Priority: optional' from d/control
   * Switch to debhelper-compat level 14
   * Add a symbols file
   * Add autopkgtest
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