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