Forums - OpenCV and FastCV static linking

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OpenCV and FastCV static linking
razvan23
Join Date: 24 Mar 13
Posts: 4
Posted: Thu, 2015-11-05 14:43
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Hi, I am having issues when building OpenCV and FastCV as static libs. Here is my Android.mk:
 
    LOCAL_PATH := $(call my-dir)
    
    include $(CLEAR_VARS)
    
    OPENCV_CAMERA_MODULES:=on
    OPENCV_INSTALL_MODULES:=on
    
    include /Users/Razvan/Android/OpenCV-2.4.10-android-sdk/sdk/native/jni/OpenCV.mk
    
    USE_OPENGL_ES_1_1 := false
    
    ifeq ($(USE_OPENGL_ES_1_1), true)
        OPENGLES_LIB  := -lGLESv1_CM
        OPENGLES_DEF  := -DUSE_OPENGL_ES_1_1
    else
        OPENGLES_LIB  := -lGLESv2
        OPENGLES_DEF  := -DUSE_OPENGL_ES_2_0
    
    endif
    
    
    LOCAL_MODULE    := drive_assist
    LOCAL_SRC_FILES += jni_part.cpp GridTracking.cpp CameraRendererRGB565GL2.cpp FastCVSampleRenderer.cpp CameraUtil.cpp
    LOCAL_LDLIBS +=  -llog -ldl $(OPENGLES_LIB) -lfastcv 
    LOCAL_CFLAGS += -Wno-write-strings $(OPENGLES_DEF) -ffast-math -O3 -fopenmp -funroll-loops
    LOCAL_LDFLAGS +=-O3 -fopenmp 
    
    
    LOCAL_CPPFLAGS := -O3 -flto -ffunction-sections -fdata-sections
    LOCAL_CPPFLAGS += -fvisibility=hidden -fvisibility-inlines-hidden 
    LOCAL_CPPFLAGS += -fomit-frame-pointer -funroll-loops -ffast-math
    LOCAL_CPPFLAGS += -mfloat-abi=softfp -DFPM_ARM -DNDEBUG
    LOCAL_STATIC_LIBRARIES += libfastcv
    LOCAL_SHARED_LIBRARIES := liblog libGLESv2
    
    include $(BUILD_SHARED_LIBRARY)
 
 
I get weird undefined reference errors in the OpenCV native library, for example:
 
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:353: error: undefined reference to 'cv::Mat::create(int, int const*, int)'
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:278: error: undefined reference to 'cv::fastFree(void*)'
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:278: error: undefined reference to 'cv::fastFree(void*)'
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:278: error: undefined reference to 'cv::fastFree(void*)'
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:367: error: undefined reference to 'cv::Mat::deallocate()'
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:367: error: undefined reference to 'cv::Mat::deallocate()'
    /Users/Razvan/Android/OpenCV-2.4.11-android-sdk/sdk/native/jni/include/opencv2/core/mat.hpp:367: error: undefined reference to 'cv::Mat::deallocate()'
 
 
The strange thing is that if I remove the FastCV stuff, OPenCV will compile and work perfectly. I do NOT want to use dynamic linking and the OpenCV manager. Does anyone have any suggestions for my issue?
 
Thanks!
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Re: OpenCV and FastCV static linking
krishanu6690
Join Date: 24 Nov 13
Posts: 10
Posted: Thu, 2015-11-05 21:42
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Can you please remove -lfastcv from LOCAL_LDLIBS +=  -llog -ldl $(OPENGLES_LIB) -lfastcv  and try once?

In my opinion, we LOCAL_LDLIBS for system library dependencies. If we want to point to another library, it is better to use it only in LOCAL_STATIC_LIBRARIES and LOCAL_SHARED_LIBRARIES

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Re: OpenCV and FastCV static linking
razvan23
Join Date: 24 Mar 13
Posts: 4
Posted: Fri, 2015-11-06 09:04
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The way it works is by modifying shared libs as follows:

LOCAL_SHARED_LIBRARIES += lopencv_java liblog libGLESv2

 

 

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