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Topics: Mobile Full archive →

The Wire · Showcase

SWIFT RUNTIME GETS BULK REFCOUNTING BOOST, FLUTTER TRACKING UPSTREAM DARTS

By RepoJournal · Filed · About Mobile platforms

engine-flutter-autoroll mikeash eeckstein rbbozkurt Lau Ching Jun FlickerSoul Konrad `ktoso` Malawski
8 people shipped this
engine-flutter-autoroll @engine-flutter-autoroll 2 cited mikeash @mikeash 2 cited eeckstein @eeckstein 1 cited rbbozkurt @rbbozkurt 1 cited Lau Ching Jun @chingjun FlickerSoul @FlickerSoul Konrad `ktoso` Malawski @ktoso Cristian Garcia @CristianGM

Swift's refcounting test suite just got faster with bulk operations, while Flutter is locked in sync with three concurrent Dart SDK rolls as the platform teams chase down edge cases near powers of two.

Apple's Swift team landed a significant runtime optimization [1] that speeds up refcounting tests by batching operations and targeting the edge cases that matter: areas near powers of two where overflow issues hide. The same team also shipped a new build option [2] to lazy-link Foundation and CoreFoundation symbols directly rather than looking them up dynamically, cutting unnecessary library loads. A companion deinit barrier fix [3] prevents SIL from mis-compiling code where destructors interact with dynamic access scopes that protect memory. Over on Flutter's end, the autoroller has been aggressive with Dart SDK updates [4] [5], rolling three times in rapid succession as version 3.14.0-dev evolves. Kotlin's Swift Package Manager integration picked up a fix [6] where lock files were being ignored when version constraints switched from exact to range specifications. Across all three desks, 17 commits and 17 PRs moved the mobile platform stack forward, with Swift's runtime team owning the momentum.

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Action items

References

  1. [1] [Runtime] Speed up the long refcounting tests by refcounting in bulk. ↗ apple/swift
  2. [2] [Build] Add SWIFT_STDLIB_ENABLE_LAZY_LINK for upward-linked symbols. ↗ apple/swift
  3. [3] SIL: make dynamic access scopes a deinit barrier ↗ apple/swift
  4. [4] Roll Dart SDK from 923415105b1e to 7239be9b8b07 (1 revision) (#190801) flutter/flutter
  5. [5] Roll Dart SDK from b608f3238a0f to 923415105b1e (1 revision) (#190796) flutter/flutter
  6. [6] [KT-88154] Swift PM lock file is ignored on switching version from `exact` to `from` JetBrains/kotlin

Quick answers

What shipped in Mobile platforms on August 9, 2026?
Swift's refcounting test suite just got faster with bulk operations, while Flutter is locked in sync with three concurrent Dart SDK rolls as the platform teams chase down edge cases near powers of two. In total, 17 commits and 17 pull requests landed.
Who contributed to Mobile platforms on August 9, 2026?
8 developers shipped this update, including Lau Ching Jun, engine-flutter-autoroll, mikeash, FlickerSoul, eeckstein, Konrad `ktoso` Malawski, rbbozkurt, and Cristian Garcia.
What were the notable Mobile platforms updates?
[Runtime] Speed up the long refcounting tests by refcounting in bulk, [Build] Add SWIFT_STDLIB_ENABLE_LAZY_LINK for upward-linked symbols, and SIL: make dynamic access scopes a deinit barrier.

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