Run the CMake smoke test on Windows

This would have caught a recent regression.

Author: jakepetroules

.github/scripts/windows_pre_build.ps1

@@ -0,0 +1,20 @@
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift open source project
+##
+## Copyright (c) 2025 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See http://swift.org/LICENSE.txt for license information
+## See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
+
+if ($env:INSTALL_CMAKE -eq "1") {
+    winget install -e --id Kitware.CMake
+    winget install -e --id Ninja-build.Ninja
+}
+
+if ($env:SKIP_ANDROID -eq "1") {
+    winget install -e --id Google.AndroidStudio
+}

.github/workflows/pull_request.yml

@@ -29,7 +29,10 @@ jobs:
       linux_pre_build_command: SKIP_ANDROID=1 INSTALL_CMAKE=1 ./.github/scripts/linux_pre_build.sh
       linux_build_command: 'swift package -Xbuild-tools-swiftc -DUSE_PROCESS_SPAWNING_WORKAROUND cmake-smoke-test --disable-sandbox --cmake-path `which cmake` --ninja-path `which ninja` --extra-cmake-arg -DCMAKE_C_COMPILER=`which clang` --extra-cmake-arg -DCMAKE_CXX_COMPILER=`which clang++` --extra-cmake-arg -DCMAKE_Swift_COMPILER=`which swiftc`'
       linux_swift_versions: '["nightly-main"]'
-      windows_swift_versions: '[]'
+      windows_pre_build_command: 'Invoke-Program powershell -Command "$env:SKIP_ANDROID = ''1''; $env:INSTALL_CMAKE = ''1''; .\.github\scripts\windows_pre_build.ps1"'
+      windows_swift_versions: '["nightly-main"]'
+      windows_build_command: 'Invoke-Program swift package -Xbuild-tools-swiftc -DUSE_PROCESS_SPAWNING_WORKAROUND cmake-smoke-test --disable-sandbox --cmake-path (Get-Command cmake).Path --ninja-path (Get-Command ninja).Path --extra-cmake-arg -DCMAKE_C_COMPILER=(Get-Command clang).Path --extra-cmake-arg -DCMAKE_CXX_COMPILER=(Get-Command clang++).Path --extra-cmake-arg -DCMAKE_Swift_COMPILER=(Get-Command swiftc).Path'
+
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main