Update optimized lib to build on Windows

ghstack-source-id: 5fa8caa
ghstack-comment-id: 3208323478
Pull-Request: #13564

Author: GregoryComer

.github/workflows/build-presets.yml

@@ -109,7 +109,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        preset: [windows] # TODO (gjcomer) Re-enable pybind once functional
+        preset: [pybind, windows]
     with:
       job-name: build
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
@@ -127,7 +127,7 @@ jobs:
           conda activate et
 
           python install_requirements.py
-          cmake --preset ${{ matrix.preset }}
+          cmake --preset ${{ matrix.preset }} -T ClangCL
           if (\$LASTEXITCODE -ne 0) {
             Write-Host "CMake configuration was unsuccessful. Exit code: \$LASTEXITCODE."
             exit \$LASTEXITCODE

tools/cmake/preset/pybind.cmake

@@ -21,16 +21,25 @@ set_overridable_option(EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_DATA_LOADER ON)
 set_overridable_option(EXECUTORCH_BUILD_KERNELS_OPTIMIZED ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_MODULE ON)
-set_overridable_option(EXECUTORCH_BUILD_EXTENSION_TRAINING ON)
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   set_overridable_option(EXECUTORCH_BUILD_COREML ON)
+  set_overridable_option(EXECUTORCH_BUILD_EXTENSION_TRAINING ON)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
   set_overridable_option(EXECUTORCH_BUILD_COREML ON)
+  set_overridable_option(EXECUTORCH_BUILD_EXTENSION_TRAINING ON)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows" OR CMAKE_SYSTEM_NAME STREQUAL
                                                "WIN32"
 )
-  # Windows or other OS-specific code here
+  if (NOT CMAKE_GENERATOR_TOOLSET MATCHES "ClangCL")
+    message(FATAL_ERROR "ExecuTorch requires the ClangCL toolset on Windows. Please configure with -T ClangCL.")
+  endif()
+
+  # These XNNPACK options don't currently build on Windows with Clang.
+  set_overridable_option(XNNPACK_ENABLE_AVX256SKX OFF)
+  set_overridable_option(XNNPACK_ENABLE_AVX256VNNI OFF)
+  set_overridable_option(XNNPACK_ENABLE_AVX256VNNIGFNI OFF)
+  set_overridable_option(XNNPACK_ENABLE_AVX512BF16 OFF)
 else()
   message(
     FATAL_ERROR "Unsupported CMAKE_SYSTEM_NAME for pybind: ${CMAKE_SYSTEM_NAME}"