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Title: Silence experimental coroutine deprecation warnings by hugovk · Pull Request #150788 · python/cpython · GitHub

Open Graph Title: Silence experimental coroutine deprecation warnings by hugovk · Pull Request #150788 · python/cpython

X Title: Silence experimental coroutine deprecation warnings by hugovk · Pull Request #150788 · python/cpython

Description: The Windows release build fails for today's 3.15 beta 2: C:\...\MSVC\14.51.36231\include\experimental\coroutine(37,1): error C2338: static assertion failed: 'error STL1011: The /await compiler option, , , and are deprecated by Microsoft and will be REMOVED SOON. ... You can define _SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS to suppress this error for now.' https://dev.azure.com/Python/cpython/_build/results?buildId=170819&view=logs&j=0108ec1a-385a-59f8-f3cd-2c3a968973ca&t=e19eaefe-6260-5118-3fc8-77764c035640 Here's Claude's summary, and it affects more than free-threaded debug AMD64. This PR does fix number 1. Build: Azure Pipelines build 170819 (Python 3.15.0b2, free-threaded debug AMD64), 2026-06-02. Symptom python_uwp.vcxproj fails at the very end of the build: C:\...\MSVC\14.51.36231\include\experimental\coroutine(37,1): error C2338: static assertion failed: 'error STL1011: The /await compiler option, , , and are deprecated by Microsoft and will be REMOVED SOON. ... You can define _SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS to suppress this error for now.' Root cause Toolchain bump on the agent image — not a code regression. Build Date Toolchain Result Previous 2026-05-10 VS 2022 / MSVC 14.44.35207 ✅ passes (deprecation = warning) Failing 2026-06-02 VS 18 / MSVC 14.51.36231 ❌ fails (deprecation = static_assert) PC/python_uwp.cpp transitively pulls in via its includes under /std:c++17. The file already silences the clang-equivalent warning but has no MSVC silencer. Why the toolchain changed windows-release/azure-pipelines.yml:174 (added in release-tools PR python/release-tools#346, Support optionally building AMD64 with tailcalling) routes tail-calling builds to the windows-2025-vs2026 agent image, which ships VS 18: vmImage: ${{ iif(eq(parameters.DoTailCalling, 'true'), 'windows-2025-vs2026', parameters.vmImage) }} Non-tailcall builds still go to the default windows-2025 (VS 2022) image and are unaffected. Fix options (upstream CPython, not release-tools) Quick — add _SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS to PC/python_uwp.cpp (matching the existing clang silencer) or to the preprocessor defines in PCbuild/python_uwp.vcxproj and PCbuild/pythonw_uwp.vcxproj. Proper — bump those two vcxprojs from /std:c++17 to /std:c++20; modern C++/WinRT uses the standard header in C++20 mode. PCbuild/_wmi.vcxproj is already on C++20. Workaround to ship now Queue the release build without DoTailCalling=true so it lands on the VS 2022 agent.

Open Graph Description: The Windows release build fails for today's 3.15 beta 2: C:\...\MSVC\14.51.36231\include\experimental\coroutine(37,1): error C2338: static assertion failed: 'error STL1011: The /await compi...

X Description: The Windows release build fails for today's 3.15 beta 2: C:\...\MSVC\14.51.36231\include\experimental\coroutine(37,1): error C2338: static assertion failed: 'error STL1011: The /awa...

Opengraph URL: https://github.com/python/cpython/pull/150788

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