-fno-unwind-tables -fno-asynchronous-unwind-tables -fno-unroll-loops \
-fmerge-all-constants -fno-math-errno \
-marm -mtune=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard
-fno-unwind-tables -fno-asynchronous-unwind-tables -fno-unroll-loops \
-fmerge-all-constants -fno-math-errno \
-marm -mtune=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard