From b79f2e1b55efdd3c60a610561d196b023708ae75 Mon Sep 17 00:00:00 2001
From: Gregory Comer <gregoryjcomer@gmail.com>
Date: Sat, 9 Aug 2025 12:03:48 -0700
Subject: [PATCH 1/2] Update

[ghstack-poisoned]
---
 .github/workflows/build-presets.yml | 16 ++++------------
 CMakePresets.json                   | 15 +++++++++++++++
 tools/cmake/preset/windows.cmake    | 21 +++++++++++++++++++++
 3 files changed, 40 insertions(+), 12 deletions(-)
 create mode 100644 tools/cmake/preset/windows.cmake

diff --git a/.github/workflows/build-presets.yml b/.github/workflows/build-presets.yml
index 160c07af15e..91c3bb09b23 100644
--- a/.github/workflows/build-presets.yml
+++ b/.github/workflows/build-presets.yml
@@ -6,6 +6,8 @@ on:
     branches:
       - main
       - release/*
+    paths:
+      - .github/workflows/build-presets.yml
   workflow_dispatch:
 
 concurrency:
@@ -109,7 +111,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        preset: [pybind]
+        preset: [pybind, windows]
     with:
       job-name: build
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
@@ -119,24 +121,14 @@ jobs:
         set -eux
         conda init powershell
         powershell -Command "& {
-          Set-PSDebug -Trace 1
           \$ErrorActionPreference = 'Stop'
-          \$PSNativeCommandUseErrorActionPreference = \$true
+          Set-PSDebug -Trace 2
 
           conda create --yes --quiet -n et python=3.12
           conda activate et
 
           python install_requirements.py
           cmake --preset ${{ matrix.preset }}
-          if (\$LASTEXITCODE -ne 0) {
-            Write-Host "CMake configuration was unsuccessful. Exit code: \$LASTEXITCODE."
-            exit \$LASTEXITCODE
-          }
-
           \$numCores = [System.Environment]::GetEnvironmentVariable('NUMBER_OF_PROCESSORS') - 1
           cmake --build cmake-out -j \$numCores
-          if (\$LASTEXITCODE -ne 0) {
-            Write-Host "CMake build was unsuccessful. Exit code: \$LASTEXITCODE."
-            exit \$LASTEXITCODE
-          }
         }"
diff --git a/CMakePresets.json b/CMakePresets.json
index 9a3e9290d43..cc293730292 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -120,6 +120,21 @@
             ]
         }
     },
+    {
+      "name": "windows",
+      "displayName": "Build ExecuTorch for Windows",
+      "inherits": ["common"],
+      "cacheVariables": {
+        "CMAKE_SYSTEM_NAME": "Windows",
+        "EXECUTORCH_BUILD_PRESET_FILE": "${sourceDir}/tools/cmake/preset/windows.cmake"
+      },
+      "toolset": "ClangCL",
+      "condition": {
+        "lhs": "${hostSystemName}",
+        "type": "equals",
+        "rhs": "Windows"
+      }
+    },
     {
         "name": "zephyr",
         "displayName": "Build ExecuTorch for Zephyr RTOS",
diff --git a/tools/cmake/preset/windows.cmake b/tools/cmake/preset/windows.cmake
new file mode 100644
index 00000000000..e6be8aa6c3b
--- /dev/null
+++ b/tools/cmake/preset/windows.cmake
@@ -0,0 +1,21 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+
+# keep sorted
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_DATA_LOADER ON)
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_EVALUE_UTIL ON)
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR ON)
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_MODULE ON)
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_RUNNER_UTIL ON)
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_TENSOR ON)
+
+# Below options are not yet buildable on Windows, but should be.
+set(EXECUTORCH_BUILD_PORTABLE_OPS OFF CACHE BOOL "")
+#set_overridable_option(EXECUTORCH_BUILD_EXECUTOR_RUNNER ON)
+#set_overridable_option(EXECUTORCH_BUILD_KERNELS_OPTIMIZED ON)
+#set_overridable_option(EXECUTORCH_BUILD_KERNELS_QUANTIZED ON)
+#set_overridable_option(EXECUTORCH_BUILD_XNNPACK ON)

From 52b9ff1d73e936a3acf945df865db44741b3644f Mon Sep 17 00:00:00 2001
From: Gregory Comer <gregoryjcomer@gmail.com>
Date: Sat, 9 Aug 2025 20:12:16 -0700
Subject: [PATCH 2/2] Update

[ghstack-poisoned]
---
 .github/workflows/build-presets.yml | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/build-presets.yml b/.github/workflows/build-presets.yml
index 91c3bb09b23..8cb25c74691 100644
--- a/.github/workflows/build-presets.yml
+++ b/.github/workflows/build-presets.yml
@@ -6,8 +6,6 @@ on:
     branches:
       - main
       - release/*
-    paths:
-      - .github/workflows/build-presets.yml
   workflow_dispatch:
 
 concurrency:
@@ -121,14 +119,24 @@ jobs:
         set -eux
         conda init powershell
         powershell -Command "& {
+          Set-PSDebug -Trace 1
           \$ErrorActionPreference = 'Stop'
-          Set-PSDebug -Trace 2
+          \$PSNativeCommandUseErrorActionPreference = \$true
 
           conda create --yes --quiet -n et python=3.12
           conda activate et
 
           python install_requirements.py
           cmake --preset ${{ matrix.preset }}
+          if (\$LASTEXITCODE -ne 0) {
+            Write-Host "CMake configuration was unsuccessful. Exit code: \$LASTEXITCODE."
+            exit \$LASTEXITCODE
+          }
+
           \$numCores = [System.Environment]::GetEnvironmentVariable('NUMBER_OF_PROCESSORS') - 1
           cmake --build cmake-out -j \$numCores
+          if (\$LASTEXITCODE -ne 0) {
+            Write-Host "CMake build was unsuccessful. Exit code: \$LASTEXITCODE."
+            exit \$LASTEXITCODE
+          }
         }"