iox-#2011 Solve a warning when building in Release mode.

[clalancette]

When building the iceoryx_hoofs package from the release_2.0 branch in Release mode (-DCMAKE_BUILD_TYPE=Release), with gcc 13, we get warnings like the following:

In file included from /home/ubuntu/rolling_ws/src/eclipse-iceoryx/iceoryx/iceoryx_posh/source/popo/subscriber_options.cpp:17:
In constructor ‘iox::popo::SubscriberOptions::SubscriberOptions(iox::popo::SubscriberOptions&&)’,
    inlined from ‘bool iox::cxx::variant<Types>::emplace_at_index(CTorArguments&& ...) [with long unsigned int TypeIndex = 0; CTorArguments = {iox::popo::SubscriberOptions}; Types = {iox::popo::SubscriberOptions, iox::cxx::Serialization::Error}]’ at /home/ubuntu/rolling_ws/install/iceoryx_hoofs/include/iceoryx/v2.0.6/iceoryx_hoofs/internal/cxx/variant.inl:174:5,
    inlined from ‘constexpr iox::cxx::variant<Types>::variant(const iox::cxx::in_place_index<N>&, CTorArguments&& ...) [with long unsigned int N = 0; CTorArguments = {iox::popo::SubscriberOptions}; Types = {iox::popo::SubscriberOptions, iox::cxx::Serialization::Error}]’ at /home/ubuntu/rolling_ws/install/iceoryx_hoofs/include/iceoryx/v2.0.6/iceoryx_hoofs/internal/cxx/variant.inl:42:24,
    inlined from ‘iox::cxx::expected<ValueType, ErrorType>::expected(iox::cxx::success<ValueType>&&) [with ValueType = iox::popo::SubscriberOptions; ErrorType = iox::cxx::Serialization::Error]’ at /home/ubuntu/rolling_ws/install/iceoryx_hoofs/include/iceoryx/v2.0.6/iceoryx_hoofs/internal/cxx/expected.inl:93:7,
    inlined from ‘static iox::cxx::expected<iox::popo::SubscriberOptions, iox::cxx::Serialization::Error> iox::popo::SubscriberOptions::deserialize(const iox::cxx::Serialization&)’ at /home/ubuntu/rolling_ws/src/eclipse-iceoryx/iceoryx/iceoryx_posh/source/popo/subscriber_options.cpp:56:61:
/home/ubuntu/rolling_ws/src/eclipse-iceoryx/iceoryx/iceoryx_posh/include/iceoryx_posh/popo/subscriber_options.hpp:32:8: warning: ‘queueFullPolicy’ may be used uninitialized [-Wmaybe-uninitialized]
   32 | struct SubscriberOptions
      |        ^~~~~~~~~~~~~~~~~
/home/ubuntu/rolling_ws/src/eclipse-iceoryx/iceoryx/iceoryx_posh/source/popo/subscriber_options.cpp: In static member function ‘static iox::cxx::expected<iox::popo::SubscriberOptions, iox::cxx::Serialization::Error> iox::popo::SubscriberOptions::deserialize(const iox::cxx::Serialization&)’:
/home/ubuntu/rolling_ws/src/eclipse-iceoryx/iceoryx/iceoryx_posh/source/popo/subscriber_options.cpp:40:23: note: ‘queueFullPolicy’ was declared here
   40 |     QueueFullPolicyUT queueFullPolicy;
      |       

This change avoids the warning by just always assigning a zero. However, this isn't really a serious attempt at a fix, but more of a way to start a discussion. I noticed that the main branch compiles without warnings, but does not have this zero in place. That said, I do not understand the mechanism that is being used there, so I'm having trouble tracking down the difference between the main branch and this one. Any thoughts on the "correct" way to fix this?

(skipping the rest of the checklist for now until we decide what to do here)

Notes for Reviewer

Pre-Review Checklist for the PR Author

1. [x] Code follows the coding style of CONTRIBUTING.md
2. [x] Tests follow the best practice for testing
3. [x] Changelog updated in the unreleased section including API breaking changes
4. [x] Branch follows the naming format (iox-123-this-is-a-branch)
5. [x] Commits messages are according to this guideline
   • [x] Commit messages have the issue ID (iox-#123 commit text)
   • [x] Commit author matches Eclipse Contributor Agreement (and ECA is signed)
6. [x] Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
7. [x] Relevant issues are linked
8. [x] Add sensible notes for the reviewer
9. [x] All checks have passed (except task-list-completed)
10. [x] Assign PR to reviewer

Checklist for the PR Reviewer

• [x] Consider a second reviewer for complex new features or larger refactorings
• [x] Commits are properly organized and messages are according to the guideline
• [x] Code according to our coding style and naming conventions
• [x] Unit tests have been written for new behavior
• [x] Public API changes are documented via doxygen
• [x] Copyright owner are updated in the changed files
• [x] All touched (C/C++) source code files from iceoryx_hoofs have been added to ./clang-tidy-diff-scans.txt
• [x] PR title describes the changes

Post-review Checklist for the PR Author

1. [x] All open points are addressed and tracked via issues

References

• Relates to #2011

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.47%. Comparing base (434ee45) to head (a4a1157). Report is 3 commits behind head on release_2.0.

Additional details and impacted files

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[elBoberido]

Once again, thanks for fixing the warnings. Could you please add iox-#210 to the commit message ... and push ;)

[clalancette]

Once again, thanks for fixing the warnings. Could you please add iox-#210 to the commit message ... and push ;)

Sorry for the delay here. I've now done that.