I am trying to build opencv (version 3.4.2) for Android using ndk-18-beta1 and c++_static since this ndk does not support gnustl_static anymore.
I created my ndk-config.py file with just armeabi-v7a architecture:
ABIs = [
ABI("2", "armeabi-v7a", "arm-linux-androideabi-clang3.5", cmake_vars=dict(ANDROID_ABI='armeabi-v7a with NEON', ANDROID_STL="c++_static")),
]
to use c++_static and clang toolchain.
And build it just with:
../opencv-3.4.2/platforms/android/build_sdk.py --ndk_path [path_to_ndk-r18-beta1] --sdk_path [path_to_sdk_25] --config my-ndk-config.py ./build ../opencv-3.4.2
The output libraries sizes are huge when comparing with the ones downloaded from opencv releases.
The armeabi-v7a folder size is 178M.
Each library size is:
13M libopencv_calib3d.a
29M libopencv_core.a
48M libopencv_dnn.a
10M libopencv_features2d.a
4.4M libopencv_flann.a
528K libopencv_highgui.a
5.6M libopencv_imgcodecs.a
25M libopencv_imgproc.a
7.7M libopencv_ml.a
4.9M libopencv_objdetect.a
6.5M libopencv_photo.a
2.5M libopencv_shape.a
8.6M libopencv_stitching.a
1.7M libopencv_superres.a
2.9M libopencv_video.a
2.8M libopencv_videoio.a
4.1M libopencv_videostab.a
The armeabi-v7a folder for downloaded opencv Android release is only 28M, and each library size is:
1.9M libopencv_calib3d.a
4.5M libopencv_core.a
7.6M libopencv_dnn.a
1.2M libopencv_features2d.a
1.1M libopencv_flann.a
92K libopencv_highgui.a
796K libopencv_imgcodecs.a
5.0M libopencv_imgproc.a
1.4M libopencv_ml.a
644K libopencv_objdetect.a
1.2M libopencv_photo.a
420K libopencv_shape.a
1.0M libopencv_stitching.a
260K libopencv_superres.a
476K libopencv_video.a
312K libopencv_videoio.a
580K libopencv_videostab.a
I also trying to compile with -Oz flag and the size didn't change that much (maybe it will be valid when creating the final .so).
What am I missing here?
