Custom gz-msgs example raises "File already exists in database" warnings

[romulogcerqueira]

Environment

• OS Version: Ubuntu 22.04
• Source build: gz-msgs10 / commit: 0da35a8b1239c3186e398ac4ed2dbe1762f3aaa4

Description

When compiling the generating_custom_msgs example and setting the GZ_DESCRIPTOR_PATH environment variable to point to the path of the generated .gz_desc file, the following warnings are raised when running the Gazebo stack.

[libprotobuf ERROR google/protobuf/descriptor_database.cc:120] File already exists in database: gz/msgs/time.proto
[libprotobuf ERROR google/protobuf/descriptor_database.cc:120] File already exists in database: gz/msgs/header.proto

Steps to reproduce / Output

[azeey]

@iche033 to test if this is fixed by https://github.com/gazebosim/gz-msgs/pull/472

[iche033]

after taking a closer look, I think this is unrelated to #472. Tested and saw that warnings are still printed.