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Kotlin: update test compiler and documentation to 2.4.21 - #23092
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Update the default compiler used for extractor testing and the documented supported-version range. Kotlin 2.4.21 was already supported by the existing extractor, so there is no analysis behaviour change. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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🟢 Approval recommended
No active review issues were identified in the limited wrapper-default and supported-version documentation updates.
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What changed in this PR
Updates Kotlin extractor development defaults and documentation to reflect Kotlin 2.4.21 while preserving the existing 2.4.20 extractor baseline and explicit version selections.
Changes:
- Bumps the development wrapper’s default Kotlin compiler from 2.4.20 to 2.4.21.
- Updates the documented supported Kotlin compiler range through 2.4.21.
- Leaves extractor implementation, analysis behavior, and packaging baselines unchanged.
| File | Description |
|---|---|
| java/kotlin-extractor/dev/wrapper.py | Sets Kotlin 2.4.21 as the default compiler for local development and CI. |
| docs/codeql/reusables/supported-versions-compilers.rst | Documents Kotlin compiler support through version 2.4.21. |
Review effort: Lite (auto)
jketema
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Nov 11, 2026
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| Eclipse compiler for Java (ECJ) [6]_",``.java`` | ||
| Kotlin,"Kotlin 1.8.0 to 2.4.20","kotlinc",``.kt`` | ||
| Kotlin,"Kotlin 1.8.0 to 2.4.21","kotlinc",``.kt`` |
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I thought we had something like 2.4.2x here before. Did we accidentally drop that?
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Update the default Kotlin compiler used for extractor testing to 2.4.21 and the documented supported-version range.
The wrapper in
java/kotlin-extractor/dev/provides thekotlinandkotlinccommands for local development and CI. The K2 CI job selects its default version, so bumping this moves ongoing K2 coverage from compiler 2.4.20 to 2.4.21 rather than relying on a one-off compatibility check. Explicit version selections remain unchanged, as does the 2.4.20 compiler baseline used to build the extractor.Kotlin 2.4.21 was already supported by the existing extractor. This does not change analysis behaviour, so no change note is needed.
All 205 tests in the full K2 suite passed with Kotlin 2.4.21.