I'm using android-opencv (android-opencv -- http://code.google.com/p/android-opencv/ -- ) , it was built successfully and worked like charm. Then I tried to use "cvCanny" to detect faces but the linker reported an error "undefined reference".
I tried lot's of things to fix this, but couldn't solve it.
/home1/apps/c/opencv-android/opencv/obj/local/armeabi-v7a/libobjdetect.a(haar.o): In function
cvHaarDetectObjects': /home1/apps/c/opencv-android/opencv/modules/objdetect/src/haar.cpp:1127: undefined reference tocvCanny' collect2: ld returned 1 exit status
compile command
/home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-gcc -nostdlib -Wl,-soname,libandroid-opencv.so -Wl,-shared,-Bsymbolic /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/yuv420sp2rgb.o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/gen/android_cv_wrap.o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/image_pool.o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/gl_code.o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/Calibration.o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/Processor.o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/objs/android-opencv/gen/cvcamera_swig.o -Wl,--whole-archive -Wl,--no-whole-archive /home1/android-ndk-crystax/build/platforms/android-5/arch-arm/usr/lib/libmissing.a /home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/lib/libstdc++.a /home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/lib/libsupc++.a /home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/libgcc.a /home1/android-ndk-crystax/build/platforms/android-5/arch-arm/usr/lib/libc.so /home1/android-ndk-crystax/build/platforms/android-5/arch-arm/usr/lib/libm.so -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-z,noexecstack -L/home1/android-ndk-crystax/build/platforms/android-5/arch-arm/usr/lib -L/home1/apps/c/opencv-android/opencv/bin/ndk/local/armeabi-v7a -L/home1/apps/c/opencv-android/opencv/obj/local/armeabi-v7a -Wl,-rpath-link=/home1/apps/c/opencv-android/opencv/obj/local/armeabi-v7a -lfeatures2d -lcalib3d -limgproc -lvideo -lhighgui -lml -llegacy -lcore -lopencv_lapack -lflann -lobjdetect -lzlib -lpng -ljpeg -ljasper -llog -lGLESv2 -Wl,-rpath-link=/home1/android-ndk-crystax/build/platforms/android-5/arch-arm/usr/lib /home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/lib/libstdc++.a /home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/lib/libsupc++.a /home1/android-ndk-crystax/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/libgcc.a -o /home1/apps/c/opencv-android/opencv/android/obj/local/armeabi-v7a/libandroid-opencv.so
When I inspect "libimgproc.a" with "nm" command, it says it has the symbol of "cvCanny" , but the linker complains ...
nm /home1/apps/c/opencv-android/opencv/obj/local/armeabi-v7a/libimgproc.a | grep cvCanny
00000000 r ZZ7cvCannyE19_PRETTY_FUNCTION__
00000001 T cvCanny
Please give me a hint about this liking problem...?