Meeting: Wednesday, August 19, 2026 · 12:00–1:00 PM ET

Facilitator: Saleem Abdulrasool

Audience: BCNY, Apple engineers, external community (open to all)

Forum: Swift Forums — Windows

1. Welcome & Agenda (~2 min)

• Kelly intro to the group
• Meeting structure
• Agendas moving forward will be email to the group + posted in forum beforehand

2. Open Forum: Community Issues (~10 min)

• **Crash Backtracer** — Karl: swift-backtrace should launch for crash reporting in his Windows GUI app, but it appears to fail to start
  • Group recommended to install the Sysinternals tools and use ProcMon to log system calls to see what backtracer is doing
• Swift concurrency — Daniel: does not map cleanly to Windows threading, so his team worked around it with a custom actor using a run loop
  • Group recommended to avoid the old Core Foundation path and use DispatchIO instead
• Izzy— ICU making SoW binaries much bigger than expected, especially for static builds
  • Group recommended to avoid FoundationInternationalization when possible and use FoundationEssentials instead, perhaps trying a smaller ICU-style approach
• Build times — Mike: ~28 min clean Windows vs ~3 min Mac, mostly a large CPU-specialization pile in the video pipeline
  • Timing-flag trace filed on GitHub Issues (cc Saleem) and on the project board?
  • Ref for others hitting this: Windows Quick Start doc
• CAS — recommended to Mike for a ~20–30% build-time reduction (persistent cache, no remote)
  • Enabled? Did it help?
• WASI on low-spec hardware — Terry blocked on storage on an i3 laptop; external drive suggested, WASI build is a one-time cost
  • Resolved?
• Izzy (Adobe) — https://github.com/swiftlang/swift/issues/89241
  • Saleem merged fix — can this be closed out or is there anything else?

3. Follow-Up: Open Action Items from August 5 (~5 min)

• Carl — cross-post Charles's follow-ups (DS2 scheduling, SDK replica results, VS 2026 / swap-file) to his Slack channel
  • Not posted yet. Charles OOO until Sept
• Carl — SPM-on-Windows prioritization with Dave Inglis
  • Saleem and Kelly chatted with Dave/Owen/Doug, and will share doc Windows and SPM Platform Gaps: Action Items and Next Steps in next Build & Packaging Workgroup (free free to add any items)
• Carl — status from Alastair on the DocC archive PR?
  • First PR reviewed, waiting for updates to merge. Will have additional PRs