From d6b52d602e4512100f175702ad5c954fe8964684 Mon Sep 17 00:00:00 2001
From: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
Date: Thu, 19 Feb 2026 13:38:46 +0100
Subject: [PATCH 1/2] GH-144679: When building with VS 2026 on Windows, use
 PlatformToolset v145 by default (GH-144680) (cherry picked from commit
 c06f4f43015528db45bd6b44b46c057d88b38583)

Co-authored-by: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
---
 .../next/Build/2026-02-10-18-26-04.gh-issue-144679.FIH73W.rst   | 2 ++
 PCbuild/python.props                                            | 2 +-
 PCbuild/pythoncore.vcxproj                                      | 2 +-
 Tools/msi/bundle/bootstrap/pythonba.vcxproj                     | 1 +
 4 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Build/2026-02-10-18-26-04.gh-issue-144679.FIH73W.rst

diff --git a/Misc/NEWS.d/next/Build/2026-02-10-18-26-04.gh-issue-144679.FIH73W.rst b/Misc/NEWS.d/next/Build/2026-02-10-18-26-04.gh-issue-144679.FIH73W.rst
new file mode 100644
index 000000000000000..ebcfda54da39a75
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2026-02-10-18-26-04.gh-issue-144679.FIH73W.rst
@@ -0,0 +1,2 @@
+When building with Visual Studio 2026 (Version 18), use PlatformToolSet v145
+by default. Patch by Chris Eibl.
diff --git a/PCbuild/python.props b/PCbuild/python.props
index 8ed6269b89149d4..15c120302a456e1 100644
--- a/PCbuild/python.props
+++ b/PCbuild/python.props
@@ -11,7 +11,7 @@
 
     We set BasePlatformToolset for ICC's benefit, it's otherwise ignored.
     -->
-    <BasePlatformToolset Condition="'$(BasePlatformToolset)' == '' and '$(VisualStudioVersion)' == '18.0'">v143</BasePlatformToolset>
+    <BasePlatformToolset Condition="'$(BasePlatformToolset)' == '' and '$(VisualStudioVersion)' == '18.0'">v145</BasePlatformToolset>
     <BasePlatformToolset Condition="'$(BasePlatformToolset)' == '' and '$(VisualStudioVersion)' == '17.0'">v143</BasePlatformToolset>
     <BasePlatformToolset Condition="'$(BasePlatformToolset)' == '' and '$(VisualStudioVersion)' == '16.0'">v142</BasePlatformToolset>
     <BasePlatformToolset Condition="'$(BasePlatformToolset)' == '' and ('$(MSBuildToolsVersion)' == '15.0' or '$(VisualStudioVersion)' == '15.0')">v141</BasePlatformToolset>
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index b911c9385634d77..69d83764fbe94bd 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -716,7 +716,7 @@
       </ClCompile>
     </ItemGroup>
   </Target>
-  <Target Name="_WarnAboutToolset" BeforeTargets="PrepareForBuild" Condition="$(PlatformToolset) != 'v141' and $(PlatformToolset) != 'v142' and $(PlatformToolset) != 'v143'">
+  <Target Name="_WarnAboutToolset" BeforeTargets="PrepareForBuild" Condition="$(PlatformToolset) != 'v143' and $(PlatformToolset) != 'v145'">
     <Warning Text="Toolset $(PlatformToolset) is not used for official builds. Your build may have errors or incompatibilities." />
   </Target>
   <Target Name="_WarnAboutZlib" BeforeTargets="PrepareForBuild" Condition="!$(IncludeExternals)">
diff --git a/Tools/msi/bundle/bootstrap/pythonba.vcxproj b/Tools/msi/bundle/bootstrap/pythonba.vcxproj
index 3970e857894ba52..4b38582f0d31e51 100644
--- a/Tools/msi/bundle/bootstrap/pythonba.vcxproj
+++ b/Tools/msi/bundle/bootstrap/pythonba.vcxproj
@@ -21,6 +21,7 @@
   <PropertyGroup Label="Globals">
     <Configuration Condition="'$(Configuration)' == ''">Release</Configuration>
     <Platform Condition="'$(Platform)' == ''">Win32</Platform>
+    <PlatformToolset Condition="'$(PlatformToolset)' == '' and '$(VisualStudioVersion)' == '18.0'">v145</PlatformToolset>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and '$(VisualStudioVersion)' == '17.0'">v143</PlatformToolset>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and '$(VisualStudioVersion)' == '16.0'">v142</PlatformToolset>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and ('$(MSBuildToolsVersion)' == '15.0' or '$(VisualStudioVersion)' == '15.0')">v141</PlatformToolset>

From ef56e51549a378cc587f98aad7d97e10911a041f Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Tue, 2 Jun 2026 17:55:28 +0300
Subject: [PATCH 2/2] Silence experimental coroutine deprecation warnings
 (#150788)

Co-authored-by: Zachary Ware <zach@python.org>
(cherry picked from commit 7241db11699f74d2e90d04cdaa8ecde2ffcfc7bf)
---
 PC/python_uwp.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/PC/python_uwp.cpp b/PC/python_uwp.cpp
index b9c408a580c9992..04174222ea8998c 100644
--- a/PC/python_uwp.cpp
+++ b/PC/python_uwp.cpp
@@ -13,6 +13,7 @@
 #if defined(__clang__)
 #define _SILENCE_CLANG_COROUTINE_MESSAGE
 #endif
+#define _SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS
 
 #include <appmodel.h>
 #include <winrt\Windows.ApplicationModel.h>