rpi compilation flags and performance

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Hi,

Is there a way to add compilation flags? I am trying to optimize for rpi3 b+ and cmake seems to ignore my requests for NEON and VFPV3. I guess the compilation will also benefit from from explicit armv8. The current master branch does not recognize the NEON If anyone already did this research and has optimization results and can post them here it would be great.

Best regards, Moshe