Oops! Sorry everyone. I didn’t realise that I was the host. g. Sent from Outlook for Mac From: "Grant Likely (Windows on Arm)" <woa@hub.corecollective.dev> athalie Chan King Choy (Windows on Arm) <woa@hub.corecollective.dev> Date: Tuesday, 25 August 2026 at 18:48 To: CoreCollective Windows on Arm <windows-on-arm@corecollective.dev> Cc: Carlos Seo <carlos.seo@linaro.org>; Kiran Chandramohan <Kiran.Chandramohan@arm.com>; Leandro Lupori <leandro.lupori@linaro.org>; Thiago Bauermann <thiago.bauermann@linaro.org>; Laurent Alfonsi <laurent.alfonsi@linaro.org> Subject: Re: [CoreCollective WoA] Notes: 2026-08-25 CoreCollective Windows on Arm Technical rm Technical Hi all, Sorry about the abrupt end to the call. I thought I had clicked the "reclaim host" button when I joined the call, but apparently it did not work & Grant was still assigned as alternate host, so Zoom took the call down when he left. 😅 The notes from this week's call are below. Please let us know if you spot any errors or important omissions. Thanks & regards, Nathalie -- CoreCollective Community Manager Android & WoA working groups Next OOO: Sep 9-11 Attended: Anthony R. Carlos S. Dave W. Evgeny K. Gleb K. Grant L. John S. Julianus Kiran C. Leandro L. Marcus P. Mayank A. Mike H. Nathalie CKC Omair J. Paul B. Rajath H. Rick D. Saket J. Thomas D. Tyler M. Links shared in chat: * From Kiran: https://packages.msys2.org/base/mingw-w64-flang * From Mayank: * https://github.com/openai/tiktoken/pull/501 * https://github.com/pytorch/pytorch/pull/194563 * https://github.com/Multicorewareinc/tensorflow * https://github.com/tensorflow/tensorflow/pull/124329 * From Gleb: * https://github.com/confluentinc/confluent-kafka-python/pull/2190 AI Notes - please notify us of inaccuracies: Meeting Overview * Discussed compiler support for Fortran and GNU toolchain integration on Windows on Arm, focusing on Flang, GFortran, and MSYS2 compatibility. * Reviewed Python package enablement progress on Windows on Arm, including PyArrow ABI3 migration, PyTorch performance optimizations, TensorFlow external releases, and CI runner availability in Azure DevOps. * Received technical updates on GCC upstreaming efforts, SEH (Structured Exception Handling) patches, native Bash execution for Git for Windows, and LLVM release and PGO build performance. Decisions/Key Takeaways * MulticoreWare created a fork and published a beta release of TensorFlow for Windows Arm64 in their external repository while upstream review continues. * SEH support for Binutils has been successfully upstreamed, with the final GCC SEH patch currently undergoing upstream review. * [Deferred] Decision on whether to prioritize Flang GNU-compatibility changes versus GFortran development for Windows on Arm deferred pending further community input and testing results. Action Items * Gleb K. * Provide context to Anthony on PyArrow ABI3 migration PRs discussion * Anthony R. * Review PyArrow ABI3 migration PRs and context provided by Gleb K. * Evgeny K. * Prepare a summary of cross-compilation test results for Fortran on Linux for the next meeting. * Marcus P. * Follow up on Azure DevOps Arm runner availability and free-tier support plans for open-source projects. * Follow up with Michael regarding the status of PyTorch releases on PyPI. * Follow up offline with Omair on processing power for LLVM builds * Mayank A. * Check team's status on confluent-kafka-python signature process issue and report back. * Discuss setting up weekly builds and tests for TensorFlow with Gaurav. * Make the PR for Open3D (instead of having Ke do it) and reach out to WoA list once the PR is created. * Nathalie C. * Set up CoreCollective Hub accounts for Rajath H. and Annamalai C. by later this week. * Rajath H. * Follow up offline with Gleb K. regarding the required NVIDIA Python and CUDA package list. * Assist in finding an OpenAI contact for the tiktoken PR. For Future * Evgeny K. scheduled to present a summary of Fortran cross-compilation test results at the next meeting. * Cryptography release with Windows on Arm support scheduled for September. Notes Fortran and Flang Toolchain for Windows on Arm * Fortran on Windows on Arm currently lacks a GNU-style compatible compiler, restricting the execution of the GFortran test suite, R tools, and GNU-dependent libraries. * Current Flang implementations are compatible with MSVC ABI, leading to integration issues when building libraries like OpenBLAS and LAPACK that rely on GNU-style infrastructure. * Two potential solutions under evaluation include updating Flang driver/linker directives for GNU library compatibility or developing GFortran for Windows on Arm. * MSYS2 currently contains downstream packages for Flang on Arm64; Kiran recommended reviewing these downstream patches for upstreaming opportunities. * Upstream GCC work has made progress with SEH integrated into Binutils, enabling native toolchain builds once the final GCC patch is accepted. Python Package Enablement and CI Infrastructure * PyArrow maintainers require an ABI3 migration to reduce wheel build output and CI storage load before accepting the Windows on Arm support PR. * Anaconda's roadmap indicates that conda and Miniconda support for Windows on Arm is not expected to be completed before October. * MulticoreWare submitted performance optimization PRs for PyTorch on Windows Arm64 and published a beta release of TensorFlow based on their fork. * Tiktoken PR #501 for Windows Arm64 support has been submitted to OpenAI, with outreach ongoing to connect with OpenAI maintainers. NVidia will join in helping to find an OpenAI Tiktoken contact. * Azure plans to expand Arm runner support, but matching the free tier is not currently on their roadmap & that will be a blocker for open-source projects * Cryptography release for Windows on Arm is targeted for September * Confluent-kafka-python PR #2190 signature process is under review following initial technical issues. GCC, LLVM, and System Utilities * Native Bash execution under MSYS2 was successfully cross-compiled and tested internally by MulticoreWare, demonstrating 3x to 5x performance improvements over emulation. * Pull requests for Git for Windows integration with native Bash are currently under review by maintainers & QC to address feedback * LLVM 23 release is expected imminently from upstream. * LLVM release build testing using ThinLTO, PGO, and PDB generation on a 16-core Arm machine required 6 hours and 45 minutes, prompting discussions on increasing GitHub runner resources. -- You received this message because you are subscribed to the Google Groups "CoreCollective Windows on Arm" group. To unsubscribe from this group and stop receiving emails from it, send an email to windows-on-arm+unsubscribe@corecollective.dev<mailto:windows-on-arm+unsubscribe@corecollective.dev>. 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