Create CMakeLists.txt for extension/llm/apple (#12626)

Author: shoumikhin

CMakeLists.txt

@@ -562,6 +562,10 @@ if(EXECUTORCH_BUILD_EXTENSION_LLM)
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/extension/llm/tokenizers)
 endif()
 
+if(EXECUTORCH_BUILD_EXTENSION_LLM_APPLE)
+  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/extension/llm/apple)
+endif()
+
 if(EXECUTORCH_BUILD_EXTENSION_LLM_RUNNER)
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/extension/llm/runner)
 endif()

extension/llm/apple/CMakeLists.txt

@@ -0,0 +1,52 @@
+# 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.
+
+# Please this file formatted by running:
+# ~~~
+# cmake-format -i CMakeLists.txt
+# ~~~
+
+cmake_minimum_required(VERSION 3.19)
+
+enable_language(Swift)
+
+# Source root directory for executorch.
+if(NOT EXECUTORCH_ROOT)
+  set(EXECUTORCH_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/../../..)
+endif()
+
+add_library(extension_llm_apple)
+
+file(GLOB OBJC_SOURCES
+  ExecuTorchLLM/Exported/*.m
+  ExecuTorchLLM/Exported/*.mm
+)
+
+target_sources(extension_llm_apple PRIVATE
+  ${OBJC_SOURCES}
+)
+
+target_include_directories(extension_llm_apple
+  PUBLIC ExecuTorchLLM/Exported
+)
+
+if(NOT TARGET extension_llm_runner)
+  add_subdirectory(
+    ${EXECUTORCH_ROOT}/extension/llm/runner
+    ${CMAKE_CURRENT_BINARY_DIR}/../runner
+  )
+endif()
+
+find_library(FOUNDATION_FRAMEWORK Foundation)
+target_link_libraries(extension_llm_apple
+  PRIVATE extension_llm_runner ${FOUNDATION_FRAMEWORK}
+)
+
+set_source_files_properties(${OBJC_SOURCES} PROPERTIES COMPILE_FLAGS
+  "-fobjc-arc"
+  "-fno-exceptions"
+  "-fno-rtti"
+)

tools/cmake/preset/apple_common.cmake

@@ -20,7 +20,7 @@ set_overridable_option(EXECUTORCH_BUILD_MPS ON)
 set_overridable_option(EXECUTORCH_XNNPACK_SHARED_WORKSPACE ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_APPLE ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_DATA_LOADER ON)
-set_overridable_option(EXECUTORCH_BUILD_EXTENSION_LLM_RUNNER ON)
+set_overridable_option(EXECUTORCH_BUILD_EXTENSION_LLM_APPLE ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_MODULE ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_TENSOR ON)

tools/cmake/preset/default.cmake

@@ -94,6 +94,11 @@ define_overridable_option(
   "Build the LLM extension"
   BOOL OFF
 )
+define_overridable_option(
+  EXECUTORCH_BUILD_EXTENSION_LLM_APPLE
+  "Build the LLM Apple extension"
+  BOOL OFF
+)
 define_overridable_option(
   EXECUTORCH_BUILD_EXTENSION_MODULE
   "Build the Module extension"