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wire 2026-09-08
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Kotlin 2.4.20 ships with deprecations and compiler fixes

By RepoJournal · Filed · About Mobile platforms

Wojtek Kaliciński Chris Bracken Mairramer robert-ancell Paul-Passeron artemcm Fabrice de Gans
12 people shipped this
Wojtek Kaliciński @wojtek-kalicinski 3 cited Chris Bracken @cbracken 1 cited Mairramer @Mairramer 1 cited robert-ancell @robert-ancell 1 cited Paul-Passeron @Paul-Passeron 1 cited artemcm @artemcm 1 cited Fabrice de Gans @Steelskin 1 cited AnthonyLatsis @AnthonyLatsis 1 cited KotlinBuild @KotlinBuild 1 cited engine-flutter-autoroll @engine-flutter-autoroll xedin @xedin Charles Zhang @karlosz

Kotlin 2.4.20 lands with a wide set of compiler and API fixes, while Flutter and Swift tooling churn through incremental build and parsing fixes.

Kotlin 2.4.20 [1] shipped with fixes across the Analysis API and K2, including a false positive for MISSING_DEPENDENCY_SUPERCLASS in kotlinx.coroutines and new APIs for accessing deserialized file annotations. Alongside the release, Kotlin's build tooling began migrating away from the deprecated `applyArgumentStrings` method in the Maven plugin and KGP, replacing it with `applyCommandLineArguments` [2][3]. A companion change [4] adds an automatic deprecation cycle: the method will move to ERROR in 2.6.0 and be removed in 2.7.0. Since the migration is behavior-preserving, existing builds that rely on `applyArgumentStrings` should keep working until removal, but planning for the replacement is now mandatory for 2.7.0.

Flutter added `itemExtentBuilder` support to `ListView.separated` [5], letting developers specify item and separator extents for optimal scrolling performance when those values are known. On Linux, the engine no longer clears the OpenGL context after drawing a frame [6]; previously, clearing left no context current and GTK could crash if its own context attempt failed. Leaving the context current gives GTK a fallback, which the author says prevents that crash. Separately, the CI toolchain updated dartdoc from 9.0.6 to 9.0.8 [7] to avoid a RangeError in `@docImport` processing; 9.0.9 was skipped because it introduces new dependency constraints.

Swift compiler work continues on foundational mechanics. A parser fix [8] corrects generic-argument recognition of function types: previously `Foo<(Int, Int) -> Bool>` was rejected under the `LiteralExpressions` feature because parentheses were unconditionally treated as a value expression. The parser now treats them as a type when not followed by `,` or `>`. Hashable derivation is moving behind a macro [9] under the `DeriveConformancesViaMacros` feature flag, replacing hand-crafted AST nodes with a `#_deriveHashable` macro call. Two test-infrastructure changes fix latent bugs: one [10] corrects tests that used the nonexistent `%swift-frontend` substitution, which previously concatenated `-frontend` onto the last argument and corrupted the availability macro, and another [11] removes `repl_swift` side-by-side runtime binding that was causing tests to fail by loading the shipped runtime instead of the in-tree one.

Action items

References

  1. [1] Kotlin 2.4.20 ↗ JetBrains/kotlin
  2. [2] [Maven] Migrate away from deprecated `applyArgumentStrings` ↗ JetBrains/kotlin
  3. [3] [KGP] Migrate away from deprecated `applyArgumentStrings` ↗ JetBrains/kotlin
  4. [4] [BTA] Add automatic deprecation cycle for `applyArgumentStrings` method ↗ JetBrains/kotlin
  5. [5] Add itemExtentBuilder support to ListView.separated (#191157) ↗ flutter/flutter
  6. [6] [Linux] Don't clear the OpenGL context when a frame has been drawn ↗ flutter/flutter
  7. [7] ci: update dartdoc from 9.0.6 to 9.0.9 (#192405) ↗ flutter/flutter
  8. [8] [Literal Expressions][Parser] Route type-shaped generic arguments as types ↗ apple/swift
  9. [9] Derive `Hashable` via macro ↗ apple/swift
  10. [10] [test] Stop using the nonexistent `%swift-frontend` substitution ↗ apple/swift
  11. [11] utils: Remove repl_swift SxS runtime binding for tests (#91429) ↗ apple/swift

$ ls mobile/reviews/ # the step-back reads

the week in review Flutter tool moves to constructor injection the month in review Swift and Flutter steady runtimes; Kotlin locks down builds
Topics: Mobile Full archive →

Quick answers

What shipped in Mobile platforms on September 8, 2026?
Kotlin 2.4.20 lands with a wide set of compiler and API fixes, while Flutter and Swift tooling churn through incremental build and parsing fixes. In total, 61 commits, 28 pull requests, and 1 releases landed.
Who contributed to Mobile platforms on September 8, 2026?
12 developers shipped this update, including Chris Bracken, Mairramer, engine-flutter-autoroll, robert-ancell, xedin, Paul-Passeron, artemcm, and Fabrice de Gans, and 4 more.
What were the notable Mobile platforms updates?
Kotlin 2.4.20, [Maven] Migrate away from deprecated `applyArgumentStrings`, and [KGP] Migrate away from deprecated `applyArgumentStrings`.
♥

$ log Mobile platforms --recent

Flutter engine rolls Skia and Fuchsia SDK 8 shipped Swift and Kotlin compiler fixes land, Flutter dependency rolls continue 30 shipped Swift's async runtime paves way for per-function CPU control and macro-driven conformance 156 shipped Flutter fixes semantics geometry, UTF-16 deletion, iOS keyboard accents 160 shipped

$ log --all # elsewhere on the wire

@openclaw Selective evidence collection and truthful reviewer prompts land in ClawSweeper AI Agents Cline desktop commands unblocked from slow backend startup

$ ls showcases/

Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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