✨ Auto-resolve buck2 binary if not provided

Author: jathu

CMakeLists.txt

@@ -75,9 +75,13 @@ if(NOT PYTHON_EXECUTABLE)
 endif()
 announce_configured_options(PYTHON_EXECUTABLE)
 
+if(NOT BUCK2)
+  resolve_buck2()
+endif()
+announce_configured_options(BUCK2)
+
 announce_configured_options(CMAKE_CXX_COMPILER_ID)
 announce_configured_options(CMAKE_TOOLCHAIN_FILE)
-announce_configured_options(BUCK2)
 
 load_build_preset()
 include(${PROJECT_SOURCE_DIR}/tools/cmake/preset/default.cmake)
@@ -290,9 +294,6 @@ set(_common_include_directories
 #
 
 if(NOT EXECUTORCH_SRCS_FILE)
-  # Find or download buck2 binary.
-  resolve_buck2()
-
   # A file wasn't provided. Run a script to extract the source lists from the
   # buck2 build system and write them to a file we can include.
   #