Undefined References Error OpenCv Android with ndk 18 (c++_static)

Question

I updated Android Studio to use the ndk18 and changed:

APP_STL := c++_static

This lead to a bunch of linker errors in OpenCv:

../thirdparty/opencv-android-sdk/sdk/native/jni/../libs/arm64-v8a/libopencv_objdetect.a(detection_based_tracker.cpp.o): In function `cv::DetectionBasedTracker::updateTrackedObjects(std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > > const&)':
detection_based_tracker.cpp:(.text._ZN2cv21DetectionBasedTracker20updateTrackedObjectsERKSt6vectorINS_5Rect_IiEESaIS3_EE+0xad8): undefined reference to `std::__throw_length_error(char const*)'
../thirdparty/opencv-android-sdk/sdk/native/jni/../libs/arm64-v8a/libopencv_objdetect.a(detection_based_tracker.cpp.o): In function `_GLOBAL__sub_I_detection_based_tracker.cpp':
detection_based_tracker.cpp:(.text.startup._GLOBAL__sub_I_detection_based_tracker.cpp+0x18): undefined reference to `std::ios_base::Init::Init()'
detection_based_tracker.cpp:(.text.startup._GLOBAL__sub_I_detection_based_tracker.cpp+0x1c): undefined reference to `std::ios_base::Init::~Init()'
detection_based_tracker.cpp:(.text.startup._GLOBAL__sub_I_detection_based_tracker.cpp+0x34): undefined reference to `std::ios_base::Init::~Init()'

How to fix this?

I am using OpenCv android sdk 3.1.

score 1 · Answer 1 · answered Sep 21 '18 at 04:35

1

You need to rebuild opencv against libc++.

answered Sep 21 '18 at 04:35

Dan Albert

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Example how to do it: https://stackoverflow.com/questions/52410712/ndk-problems-after-gnustl-has-been-removed-from-the-ndk-revision-r18/52436751#52436751 – y30 Sep 22 '18 at 16:33

score 0 · Answer 2 · answered Apr 03 '19 at 02:19

0

you need to rebuild opencv based on NDK 18, i had done it with opencv 2.4

https://github.com/2666fff/opencv-for-android

answered Apr 03 '19 at 02:19

Arthur

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Undefined References Error OpenCv Android with ndk 18 (c++_static)

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