Update CMakeLists.txt

Author: Jason2866

main/CMakeLists.txt

@@ -2,4 +2,8 @@
 set(CMAKE_AR ${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar)
 set(CMAKE_RANLIB ${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib)
 
+list(APPEND compile_options "-ffat-lto-objects"
+                            "-flto-compression-level=9"
+                            "-flto=auto")
+
 idf_component_register(SRCS "sketch.cpp" "arduino-lib-builder-gcc.c" "arduino-lib-builder-cpp.cpp" "arduino-lib-builder-as.S" INCLUDE_DIRS ".")