Bundled `idlc` in cyclonedds 11.0.1 Linux wheel crashes with segmentation fault

Description

The idlc executable bundled with cyclonedds==11.0.1 crashes immediately with a segmentation fault on Linux.

The issue has been reproduced on both Ubuntu 22.04 and Ubuntu 24.04. It is also reproducible in a newly created Ubuntu Docker container.

The same behavior occurs when running the bundled idlc directly, through cyclonedds.tools.wheel_idlc, and when invoking the dynamic loader with --list.

Tested environments

Ubuntu 22.04

OS: Ubuntu 22.04
Architecture: x86_64
cyclonedds: 11.0.1

Wheel SHA256:
9eaa0e08ea41206b495f36fa4c008ff89113f78a39e54f4a17793d9a68e7b978

Ubuntu 24.04

OS: Ubuntu 24.04
Architecture: x86_64
cyclonedds: 11.0.1

Wheel SHA256:
3e96507088c57165f7c189c3a85be866f74c7449fb0cbc6316ad306e5f599be1

The issue was also reproduced in a clean Ubuntu Docker container.

Steps to reproduce

Install the package:

python3 -m pip install cyclonedds==11.0.1

Locate the installed idlc:

python3 -m pip show -f cyclonedds | grep idlc

For example, on Ubuntu 22.04:

cyclonedds/.libs/idlc
cyclonedds/__idlc__.py
cyclonedds/tools/wheel_idlc/__init__.py

The bundled executable is located at:

~/.local/lib/python3.10/site-packages/cyclonedds/.libs/idlc

Run it directly:

~/.local/lib/python3.10/site-packages/cyclonedds/.libs/idlc -h

Actual result

Segmentation fault (core dumped)

Reproduction through the Python wrapper

Run:

python3 -c \
  'from cyclonedds.tools.wheel_idlc import command; command()' \
  -h

Actual result

Segmentation fault (core dumped)

Reproduction with an empty environment

SITE=/home/user/.local/lib/python3.10/site-packages
IDLC=$SITE/cyclonedds/.libs/idlc

env -i \
  HOME="$HOME" \
  PATH=/usr/bin:/bin \
  /lib64/ld-linux-x86-64.so.2 --list "$IDLC"

echo $?

Actual result

Segmentation fault (core dumped)
139

Expected behavior

Running:

idlc -h

or the bundled equivalent:

/path/to/site-packages/cyclonedds/.libs/idlc -h

should display the idlc command-line help and exit normally.

It should also be possible to use the bundled compiler for Python IDL generation, for example:

idlc -l py example.idl

without the executable terminating with a segmentation fault.

Start by reproducing the crash with the bundled .libs/idlc executable, the cyclonedds.tools.wheel_idlc command(), and the empty-environment loader command. Read cyclonedds/idlc.py and cyclonedds/tools/wheel_idlc/init.py alongside the wheel contents. Done means idlc -h exits normally and idlc -l py example.idl can run without a segmentation fault.