OpenCV Android native code build issue

Question

I am learning how to write C++ code using OpenCV and I want to run it in Android. I use Android Studio.

I have created a new simple project with C++ support and then I added my test code to the C++ file. My own files compile and link, it seems.

Now something else that I don't think is related to my project is causing many errors. It seems to be something inside NDK. Could it be a bug in the latest version, and if so, what can I do about it?

  C:/Android/sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin\ld: error: C:/Android/OpenCV-android-sdk/sdk/native/3rdparty/libs/x86/libippicv.a(jmp_icvippiCopyConstBorder_8u_C4IR_L_as.s.o): relocation R_386_GOTOFF against preemptible symbol icv_ippJumpIndexForMergedLibs cannot be used when making a shared object
  C:/Android/sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin\ld: error: C:/Android/OpenCV-android-sdk/sdk/native/3rdparty/libs/x86/libippicv.a(jmp_icvippiConvert_32s16u_C1RSfs_as.s.o): relocation R_386_GOTOFF against preemptible symbol icv_ippJumpIndexForMergedLibs cannot be used when making a shared object
  C:/Android/sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin\ld: error: C:/Android/OpenCV-android-sdk/sdk/native/3rdparty/libs/x86/libippicv.a(jmp_icvippiNormRel_L1_32f_C1R_as.s.o): relocation R_386_GOTOFF against preemptible symbol icv_ippJumpIndexForMergedLibs cannot be used when making a shared object
  C:/Android/sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin\ld: error: C:/Android/OpenCV-android-sdk/sdk/native/3rdparty/libs/x86/libippicv.a(jmp_icvippiFilterBilateralBorderInit_L_as.s.o): relocation R_386_GOTOFF against preemptible symbol icv_ippJumpIndexForMergedLibs cannot be used when making a shared object
  C:/Android/sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin\ld: error: C:/Android/OpenCV-android-sdk/sdk/native/3rdparty/libs/x86/libippicv.a(jmp_icvippiScaleC_32f8u_C1R_as.s.o): relocation R_386_GOTOFF against preemptible symbol icv_ippJumpIndexForMergedLibs cannot be used when making a shared object

I reverted to NDK14 instead of using default latest NDK16 and the errors are gone! — Scott Johansen, Jan 04 '18 at 11:54
@ScottJohansen I have the same problem since I updated AndroidStudio. How did you revert? — PhilLab, Jan 04 '18 at 12:47
There seems to be an attempt to fix it: https://github.com/opencv/opencv/pull/10288 — PhilLab, Jan 04 '18 at 13:03
The way I reverted was to simply download an older NDK from here and manually replace it. https://developer.android.com/ndk/downloads/older_releases.html — Scott Johansen, Jan 04 '18 at 13:32
Can you format your findings to an answer? It may help somebody in future. — ZdaR, Jan 04 '18 at 13:33

score 2 · Answer 1 · answered Feb 03 '18 at 18:44

Instead of downgrading to NDK14 from NDK16 you can still do with NDK16 by adding following to the CMakeLists.txt before add_library() :

set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a")

Copied from this discussion on a github issue

score 1 · Answer 2 · answered Jan 04 '18 at 13:39

1

I reverted to NDK 14.1.3816874 instead of using the currently latest NDK 16.1.4479499, and the errors have disappeared.

The older NDK you can find here: https://developer.android.com/ndk/downloads/older_releases.html

I hope this helps!

answered Jan 04 '18 at 13:39

Scott Johansen

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This could be because the defaults in NDK r16 have changed. To keep compatibility with prebuilt OpenCV libraries, you need to explicitly choose gnustl and gcc. – Alex Cohn Jan 04 '18 at 15:21

OpenCV Android native code build issue

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