Downgrade Win SDK to 10.0.22621.0

Author: ChrisDenton

.github/workflows/ci.yml

@@ -174,6 +174,20 @@ 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: powershell
+        if: ${{ matrix.name == 'i686-msvc-1' || matrix.name == 'i686-msvc-2' || matrix.name == 'dist-i686-msvc' }}
+        run: |
+          $env:PATH = "C:\msys64\usr\bin;" + $env:Path
+          $vs = &"${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -latest -format value -property installationPath
+          cmd /c "`"$vs\VC\Auxiliary\Build\vcvarsall.bat`" x86 10.0.22621.0 > NUL & SET" > envs.txt
+          echo "Printing current environment variables"
+          cat envs.txt
+          cat envs.txt >> $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