Update dependency dev.zacsweers.kctfork:core to v0.12.1

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
dev.zacsweers.kctfork:core	Test	minor	0.12.1	source

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

zacsweers/kotlin-compile-testing (dev.zacsweers.kctfork:core)

v0.12.1

Compare Source

2026-01-04

Happy new year!

• Fix: Correctly pass processing classpath to kapt.
• Fix: Clear KSP2's KSPCoreEnvironment as it leaks memory across multiple runs in tests.
• Fix: Clear KSP2's KspApplicationManager as an addition to the above, as an extra defensive measure.

Special thanks to @​TheMrMilchmann for contributing to this release!

v0.12.0

Compare Source

2025-12-16

• Update to Kotlin 2.3.0.
• Remove KEEP_KDOC_COMMENTS_IN_STUBS kapt option as it was removed upstream.
• Remove supportsK2 entirely, only K2 is supported going forward.

v0.11.1

Compare Source

2025-11-19

• Add pluginId properties to CompilerPluginRegistrar subtypes for forward compatibility with Kotlin 2.3.0.

v0.11.0

Compare Source

2025-10-22

• Fix: Feed generated .java files from KSP into the subsequent kotlin compilation.
• Build against KSP 2.3.0.

Special thanks to @​martinbirn for contributing to this release!

v0.10.1

Compare Source

2025-10-05

• Fix: Don't set jvmDefault automatically (previously defaulted to JvmDefaultMode.DISABLE).
• Fix: Use the new, non-deprecated jvmDefaultStable CLI option when setting jvmDefault.
• Update Okio to 3.16.1.
• Build against KSP 2.2.20-2.0.4.

v0.10.0

Compare Source

2025-10-05

• Remove support for Kotlin 1.x. Only Kotlin 2.x is supported now.
  • This includes removal of all legacy 1.x compiler APIs such as ComponentRegistrar.
• Remove support for KSP1. Only KSP2 is supported now.
• Changed verbose to be false by default.
• Build against KSP 2.2.20-2.0.3.

These changes are in preparation for the upcoming Kotlin 2.3.0, which will error on builds that detect ComponentRegistrar instances on the build classpath.

v0.9.0

Compare Source

2025-09-11

• Update to Kotlin 2.2.20. This release requires 2.2.20 or later.
• Build against KSP 2.2.20-2.0.2.

v0.8.0

Compare Source

2025-07-02

• Update classgraph to 4.8.180.
• Update okio to 3.15.0.
• Update to Kotlin 2.2.0.
• Update to KSP 2.2.0-2.0.2.
• Remove KAPT4 support as this was removed in Kotlin 2.2.
• Support K2 KAPT.

Special thanks to @​eygraber for contributing to this release!

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