From e37359d5daf0a3ab9ac0dcb9c3968c30c94293d4 Mon Sep 17 00:00:00 2001
From: Max Ren <40742183+mcr229@users.noreply.github.com>
Date: Tue, 15 Jul 2025 13:04:25 -0700
Subject: [PATCH] Change Enable KleidiAI to default in CMake (#12452)

(cherry picked from commit 54813d9898ac25f02bb632633cde2270bed413c2)
---
 backends/xnnpack/cmake/Dependencies.cmake | 10 ++++++----
 tools/cmake/preset/default.cmake          |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/backends/xnnpack/cmake/Dependencies.cmake b/backends/xnnpack/cmake/Dependencies.cmake
index ca31a1e45cb..71ade68ccb2 100644
--- a/backends/xnnpack/cmake/Dependencies.cmake
+++ b/backends/xnnpack/cmake/Dependencies.cmake
@@ -68,10 +68,12 @@ install(TARGETS xnnpack-microkernels-prod
 
 
 if(EXECUTORCH_XNNPACK_ENABLE_KLEIDI)
-    install(TARGETS kleidiai
-        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    if(TARGET kleidiai)
+        install(TARGETS kleidiai
+            LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+            ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+            PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    endif()
 endif()
 
 # Revert PIC Flag to what it originally was
diff --git a/tools/cmake/preset/default.cmake b/tools/cmake/preset/default.cmake
index f2733f591eb..9afefd4e372 100644
--- a/tools/cmake/preset/default.cmake
+++ b/tools/cmake/preset/default.cmake
@@ -258,7 +258,7 @@ define_overridable_option(
 define_overridable_option(
   EXECUTORCH_XNNPACK_ENABLE_KLEIDI
   "Enable Arm Kleidi kernels"
-  BOOL OFF
+  BOOL ON
 )
 # Turning this on cache weights between partitions and methods. If weights
 # are shared across methods/partitions then this can reduce load time and