Building
Compiler option
export CXXFLAGS="-mcpu=cortex-a15 -mfpu=neon-vfpv4 -mfloat-abi=hard -marm -mthumb-interwork -ffast-math -ftree-vectorize" CFLAGS=$CXXFLAGS
export CXXFLAGS="-mcpu=cortex-a15 -mfpu=neon-vfpv4 -mfloat-abi=hard -marm -mthumb-interwork -ffast-math -ftree-vectorize" CFLAGS=$CXXFLAGS