Reduce the opencv framework size by using size optimization

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Hi,

I am working on building a opencv.framework with a small size for our iOS application According to https://github.com/opencv/opencv/wiki..., using the size optimization could have a good result for decreasing the framework size.

I also found that in https://help.apple.com/xcode/mac/curr... we can do the optimization with GCC_OPTIMIZATION_LEVEL

I have tried to set that with "set(CMAKE_XCODE_ATTRIBUTE_GCC_OPTIMIZATION_LEVEL "Smallest")" in my CMakeList.txt file but it did not work, any one know what's the correct way to adding this setting in my framework build process?

Thanks