this is Android GPU Library GPU_TARGET_PLATFORM is the same as the Kernel. cpu kernel android GPU_TARGET_PLATFORM cortex-a9 32bit 32bit default_7a cortex-a53 32bit 32bit default_7a cortex-a53 64bit 32bit default_8a cortex-a53 64bit 64bit default_8a GPU_TARGET_PLATFORM?= default_7a