问题
I've compiled OpenCV static libraries targeting android armeabi-v7a.
Now I'm trying to link my native C++ code with those libraries through a CMakeLists.txt file in Android Studio but this fails with this weird error :
~/opencv/modules/videoio/src/container_avi.cpp:0: error: undefined reference to 'stderr'
This code comes from the libopencv_videoio.a
The interresting part of the CMakeLists.txt file is this
# linking with static libraries
target_link_libraries(native-lib
dnn ml objdetect shape stitching superres videostab calib3d features2d highgui videoio imgcodecs video photo imgproc flann core
)
Isn't it supposed to find standard libraries automatically ?
EDIT 1: Following is my Application.mk
...
NDK_TOOLCHAIN_VERSION := clang
APP_PLATFORM := android-21
APP_STL := c++_shared
...
NDK version taken from Changelog.md : r17b
EDIT 2:
As Dan suggested, I've added
"-DANDROID_PLATFORM=android-24"
to the cmake arguments
回答1:
The most likely scenario is that you built opencv for android-23+ but native-lib has a minSdkVersion below that. See https://android.googlesource.com/platform/ndk/+/master/docs/user/common_problems.md#using-mismatched-prebuilt-libraries.
来源:https://stackoverflow.com/questions/51767214/android-studio-with-ndk-link-error-undefined-reference-to-stderr