Enable NEON for the arm64 architecture too

[dulacp]

The compilation for iOS was broken due to this.

Leading to issues like this (for posterity) :

Undefined symbols for architecture arm64:
  "_png_init_filter_functions_neon", referenced from:
      _png_read_filter_row in opencv2(pngrutil.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

So now the build_framework.py force the NEON optimizations for the arm64 arch.

Cheers

[alalek]

👍

[benjamincarp]

Is there a downloadable build that includes this fix? I tried compiling locally following the instructions here but wound up with errors and the latest download on http://opencv.org/downloads.html says it is from December.

I found the page for the nightly builds but didn't see a way to download those.

[alalek]

Current artifacts from nightly build is here (with opencv_contrib)

[benjamincarp]

Thank you! I was on that page earlier today but it wasn't obvious how to (or if I could) download those builds.

[RishabGargeya]

Hi! I'm experiencing the same issues as dulaccc mentioned, and am hoping to find a downloadable build with the fix. How specifically can I download the build from the aforementioned website? Sorry if I missed something. Thank you so much!

[benjamincarp]

@RishabGargeya if you go to one of the iOS builds (http://pullrequest.opencv.org/buildbot/builders/master-contrib_iOS-mac/builds/264 works for me but there is a newer one from last night now too) then you should look at the very bottom left corner of the screen. The very last thing in the list under "Steps and Logfiles" is a link to the zip of that build. In this case it is http://pullrequest.opencv.org/buildbot/export/opencv_releases/master-contrib_iOS-mac/20160418-231924_264/

I hope that makes sense. That page is not very easy to understand at first glance but it does have what we need.

[RishabGargeya]

@benjamincarp Awesome! Thanks so much for the instructions -- I was able to download the build and successfully compile for iOS.