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Respect maybe_unused in unused-variable queries - #22932
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Cover C++17 maybe_unused local and static variables in the unused-variable query tests. Record the current alerts as spurious so the regression cases pass until the queries account for the standard attribute. Co-authored-by: Copilot <[email protected]>
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Exclude variables annotated with the standard maybe_unused attribute from the unused-local and unused-static-variable queries, and update the regression expectations. Co-authored-by: Copilot <[email protected]>
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Note that the unused-local and unused-static-variable queries no longer report variables marked with the C++17 maybe_unused attribute. Co-authored-by: Copilot <[email protected]>
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October 29, 2026 10:47
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🟢 Approval recommended
The update to honor C++17 [[maybe_unused]] in unused-variable queries has no active review issues.
No open issues 🎉
What changed in this PR
Updates the C++ unused-variable queries to respect C++17 [[maybe_unused]], addressing the annotation-related portion of #22928 without changing side-effect handling.
Changes:
- Excludes explicitly annotated variables from both unused-local and unused-static-variable results.
- Adds local and static regression cases, enabling C++17 for the static-variable test.
- Adds a change note describing the reduced false positives.
| File | Description |
|---|---|
cpp/ql/test/query-tests/Best Practices/Unused Entities/UnusedStaticVariables/test.cpp |
Enables C++17 and adds an annotated static-variable regression case. |
cpp/ql/test/query-tests/Best Practices/Unused Entities/UnusedLocals/code2.cpp |
Adds an annotated local-variable regression case. |
cpp/ql/src/change-notes/2026-10-29-unused-maybe-unused.md |
Documents the updated query behavior. |
cpp/ql/src/Best Practices/Unused Entities/UnusedStaticVariables.ql |
Exempts static variables marked maybe_unused. |
cpp/ql/src/Best Practices/Unused Entities/UnusedLocals.ql |
Exempts local variables marked maybe_unused. |
Review effort: Balanced (auto)
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DCA was uneventful |
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Teach the unused-local and unused-static-variable queries to honor the C++17 [[maybe_unused]] attribute. Add minimal local and static regression cases with generated expected results.
Fixes part of #22928.
Validation: both affected CodeQL query tests pass with CodeQL CLI 2.27.3.