1PLATFORM=x64 2O=b/c_$(PLATFORM) 3IS_X64=1 4IS_X86= 5IS_ARM64= 6CROSS_COMPILE= 7MY_ARCH= 8USE_ASM=1 9CC=$(CROSS_COMPILE)clang 10CXX=$(CROSS_COMPILE)clang++ 11USE_CLANG=1 12