Downgrade Win SDK to 10.0.22621.0

Author: ChrisDenton

.github/workflows/ci.yml

@@ -174,6 +174,22 @@ jobs:
       - name: ensure the stable version number is correct
         run: src/ci/scripts/verify-stable-version-number.sh
 
+      # Temporary fix to unblock CI
+      # We revert to an older Windows SDK for 32-bit Windows MSVC builds.
+      # See issue https://github.com/rust-lang/rust/issues/137733 for more details.
+      - name: Downgrade Windows SDK
+        shell: pwsh
+        if: ${{ matrix.name == 'i686-msvc-1' || matrix.name == 'i686-msvc-2' || matrix.name == 'dist-i686-msvc' }}
+        run: |
+          # Get the Visual Studio shell, setting the SDK version to 10.0.22621.0
+          $vs = &"${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -latest -format value -property installationPath
+          &$vs\Common7\Tools\Launch-VsDevShell.ps1 -HostArch Amd64 -Arch x86
+          Enter-VsDevshell -VsInstallPath $vs -HostArch Amd64 -Arch x86 -DevCmdArguments "-winsdk=10.0.22621.0"
+
+          # Update the github environment and path.
+          "WindowsSdkDir=$env:WindowsSdkDir" >> $env:GITHUB_ENV
+          "WindowsSDKVersion=$env:WindowsSDKVersion" >> $env:GITHUB_ENV
+
       # Show the environment just before we run the build
       # This makes it easier to diagnose problems with the above install scripts.
       - name: show the current environment