1PLATFORM=arm64 2O=b/c_$(PLATFORM) 3IS_X64= 4IS_X86= 5IS_ARM64=1 6CROSS_COMPILE= 7MY_ARCH= 8USE_ASM=1 9ASM_FLAGS=-Wno-unused-macros 10CC=$(CROSS_COMPILE)clang 11CXX=$(CROSS_COMPILE)clang++ 12USE_CLANG=1 13