✨ Integrate gflags library into build configuration

Author: jathu

CMakeLists.txt

@@ -455,14 +455,6 @@ endif()
 
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/configurations)
 
-#
-# gflags: Commandline flag host library.
-#
-
-if(EXECUTORCH_BUILD_GFLAGS)
-  add_subdirectory(third-party/gflags)
-endif()
-
 # Install `executorch` library as well as `executorch-config.cmake` under
 # ${CMAKE_INSTALL_PREFIX}/
 install(

third-party/CMakeLists.txt

@@ -6,6 +6,8 @@
 
 add_subdirectory(json)
 
+add_subdirectory(gflags)
+
 if(EXECUTORCH_BUILD_PYBIND)
   add_subdirectory(pybind11)
 endif()

tools/cmake/preset/default.cmake

@@ -209,11 +209,6 @@ define_overridable_option(
   "Build the Cortex-M backend"
   BOOL OFF
 )
-define_overridable_option(
-  EXECUTORCH_BUILD_GFLAGS
-  "Build the gflags library."
-  BOOL ON
-)
 define_overridable_option(
   EXECUTORCH_COREML_BUILD_EXECUTOR_RUNNER
   "Build CoreML executor runner."