请在底部看到更多内容！第一个问题在Linux中解决，而不是在Windows和Cygwin下解决，但是有一个新问题。请看下面的内容！
我目前正在尝试为Android NDK编译OpenCV，以便我可以在我的应用中使用它。为此我试着遵循这个指南：
http://www.stanford.edu/~zxwang/android_opencv.html
但是当用ndk-build编译下载的东西时，我得到了这个错误：
$ /cygdrive/u/flori/workspace/android-ndk-r5b/ndk-build
Compile++ thumb : opencv <= cvjni.cpp
Compile++ thumb : cxcore <= cxalloc.cpp
Compile++ thumb : cxcore <= cxarithm.cpp
Compile++ thumb : cxcore <= cxarray.cpp
Compile++ thumb : cxcore <= cxcmp.cpp
Compile++ thumb : cxcore <= cxconvert.cpp
Compile++ thumb : cxcore <= cxcopy.cpp
Compile++ thumb : cxcore <= cxdatastructs.cpp
Compile++ thumb : cxcore <= cxdrawing.cpp
Compile++ thumb : cxcore <= cxdxt.cpp
Compile++ thumb : cxcore <= cxerror.cpp
Compile++ thumb : cxcore <= cximage.cpp
Compile++ thumb : cxcore <= cxjacobieigens.cpp
Compile++ thumb : cxcore <= cxlogic.cpp
Compile++ thumb : cxcore <= cxlut.cpp
Compile++ thumb : cxcore <= cxmathfuncs.cpp
Compile++ thumb : cxcore <= cxmatmul.cpp
Compile++ thumb : cxcore <= cxmatrix.cpp
Compile++ thumb : cxcore <= cxmean.cpp
Compile++ thumb : cxcore <= cxmeansdv.cpp
Compile++ thumb : cxcore <= cxminmaxloc.cpp
Compile++ thumb : cxcore <= cxnorm.cpp
Compile++ thumb : cxcore <= cxouttext.cpp
Compile++ thumb : cxcore <= cxpersistence.cpp
Compile++ thumb : cxcore <= cxprecomp.cpp
Compile++ thumb : cxcore <= cxrand.cpp
Compile++ thumb : cxcore <= cxsumpixels.cpp
Compile++ thumb : cxcore <= cxsvd.cpp
Compile++ thumb : cxcore <= cxswitcher.cpp
Compile++ thumb : cxcore <= cxtables.cpp
Compile++ thumb : cxcore <= cxutils.cpp
StaticLibrary : libstdc++.a
StaticLibrary : libcxcore.a
Compile++ thumb : cv <= cvaccum.cpp
Compile++ thumb : cv <= cvadapthresh.cpp
Compile++ thumb : cv <= cvapprox.cpp
Compile++ thumb : cv <= cvcalccontrasthistogram.cpp
Compile++ thumb : cv <= cvcalcimagehomography.cpp
Compile++ thumb : cv <= cvcalibinit.cpp
Compile++ thumb : cv <= cvcalibration.cpp
Compile++ thumb : cv <= cvcamshift.cpp
Compile++ thumb : cv <= cvcanny.cpp
Compile++ thumb : cv <= cvcolor.cpp
Compile++ thumb : cv <= cvcondens.cpp
Compile++ thumb : cv <= cvcontours.cpp
Compile++ thumb : cv <= cvcontourtree.cpp
Compile++ thumb : cv <= cvconvhull.cpp
Compile++ thumb : cv <= cvcorner.cpp
Compile++ thumb : cv <= cvcornersubpix.cpp
Compile++ thumb : cv <= cvderiv.cpp
Compile++ thumb : cv <= cvdistransform.cpp
Compile++ thumb : cv <= cvdominants.cpp
Compile++ thumb : cv <= cvemd.cpp
Compile++ thumb : cv <= cvfeatureselect.cpp
Compile++ thumb : cv <= cvfilter.cpp
Compile++ thumb : cv <= cvfloodfill.cpp
Compile++ thumb : cv <= cvfundam.cpp
Compile++ thumb : cv <= cvgeometry.cpp
Compile++ thumb : cv <= cvhaar.cpp
Compile++ thumb : cv <= cvhistogram.cpp
Compile++ thumb : cv <= cvhough.cpp
Compile++ thumb : cv <= cvimgwarp.cpp
Compile++ thumb : cv <= cvinpaint.cpp
Compile++ thumb : cv <= cvkalman.cpp
Compile++ thumb : cv <= cvlinefit.cpp
Compile++ thumb : cv <= cvlkpyramid.cpp
Compile++ thumb : cv <= cvmatchcontours.cpp
Compile++ thumb : cv <= cvmoments.cpp
Compile++ thumb : cv <= cvmorph.cpp
Compile++ thumb : cv <= cvmotempl.cpp
Compile++ thumb : cv <= cvoptflowbm.cpp
Compile++ thumb : cv <= cvoptflowhs.cpp
Compile++ thumb : cv <= cvoptflowlk.cpp
Compile++ thumb : cv <= cvpgh.cpp
Compile++ thumb : cv <= cvposit.cpp
Compile++ thumb : cv <= cvprecomp.cpp
Compile++ thumb : cv <= cvpyramids.cpp
Compile++ thumb : cv <= cvpyrsegmentation.cpp
Compile++ thumb : cv <= cvrotcalipers.cpp
Compile++ thumb : cv <= cvsamplers.cpp
Compile++ thumb : cv <= cvsegmentation.cpp
Compile++ thumb : cv <= cvshapedescr.cpp
Compile++ thumb : cv <= cvsmooth.cpp
Compile++ thumb : cv <= cvsnakes.cpp
Compile++ thumb : cv <= cvstereobm.cpp
Compile++ thumb : cv <= cvstereogc.cpp
Compile++ thumb : cv <= cvsubdivision2d.cpp
Compile++ thumb : cv <= cvsumpixels.cpp
Compile++ thumb : cv <= cvsurf.cpp
Compile++ thumb : cv <= cvswitcher.cpp
Compile++ thumb : cv <= cvtables.cpp
Compile++ thumb : cv <= cvtemplmatch.cpp
Compile++ thumb : cv <= cvthresh.cpp
Compile++ thumb : cv <= cvundistort.cpp
Compile++ thumb : cv <= cvutils.cpp
StaticLibrary : libcv.a
SharedLibrary : libopencv.so
U:/flori/workspace/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebui
lt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-andr
oideabi/bin/ld.exe: cannot find -lcxcore
collect2: ld returned 1 exit status
make: *** [/cygdrive/u/flori/workspace/android/testOpenCV/obj/local/armeabi/libo
pencv.so] Error 1
我正在尝试在Windows系统上编译它并使用最新的NDK版本......
是否有人知道这个链接错误意味着什么以及我能够让它再次起作用？
如果有人可以提供帮助那就太好了
在问题解决后，我发现有另一种方法可以使用当前版本的OpenCV（而不是上面的1.1）和来自crystax的修改后的Android NDK来编译OpenCV for Android，它支持STL和异常因此支持最新的OpenCV版本。
所有相关信息均可在此处找到： http://opencv.willowgarage.com/wiki/Android
它说下载当前的svn trunk和crystax-r4 android-ndk，以及swig，我做了。
我进入了文件夹，创建了构建目录，运行了cmake，然后构建了静态库，这似乎有效。至少它成功运行了make-command而没有错误。
我现在想构建共享库，所以我进入了android-jni文件夹并再次运行'make'，但是出现了这个错误：
% make -j4
OPENCV_CONFIG = ../build/android-opencv.mk
make clean-swig &&\
mkdir -p jni/gen &&\
mkdir -p src/com/opencv/jni &&\
swig -java -c++ -package "com.opencv.jni" \
-outdir src/com/opencv/jni \
-o jni/gen/android_cv_wrap.cpp jni/android-cv.i
OPENCV_CONFIG = ../build/android-opencv.mk
make[1]: Entering directory `/home/florian/android-opencv-willowgarage/android/android-jni'
make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
rm -f jni/gen/android_cv_wrap.cpp
make[1]: Leaving directory `/home/florian/android-opencv-willowgarage/android/android-jni'
/home/florian/android-ndk-r4-crystax/ndk-build OPENCV_CONFIG=../build/android-opencv.mk \
PROJECT_PATH= ARM_TARGETS="armeabi armeabi-v7a" V=
/home/florian/android-ndk-r4-crystax/ndk-build OPENCV_CONFIG=../build/android-opencv.mk \
PROJECT_PATH= ARM_TARGETS="armeabi armeabi-v7a" V=
make[1]: Entering directory `/home/florian/android-opencv-willowgarage/android/android-jni'
/home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory
make[1]: Entering directory `/home/florian/android-opencv-willowgarage/android/android-jni'
/home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory
/home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory
make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
/home/florian/android-opencv-willowgarage/android/android-jni/jni/Android.mk:10: ../build/android-opencv.mk: No such file or directory
make[1]: *** No rule to make target `../build/android-opencv.mk'. Stop.
make[1]: Leaving directory `/home/florian/android-opencv-willowgarage/android/android-jni'
make: *** [libs/armeabi/libandroid-opencv.so] Error 2
make: *** Waiting for unfinished jobs....
make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
make[1]: *** No rule to make target `../build/android-opencv.mk'. Stop.
make[1]: Leaving directory `/home/florian/android-opencv-willowgarage/android/android-jni'
make: *** [libs/armeabi-v7a/libandroid-opencv.so] Error 2
有没有人知道这意味着什么以及我可以做些什么来构建共享库？
...
好了看了一下错误消息后，我发现它似乎在构建目录中缺少了一些东西......但是在android文件夹中甚至没有构建目录所以我创建了一个，运行' cmake'在那里和'make'再次但是得到这个错误：
Compile thumb : opencv_lapack <= /home/florian/android-opencv-willowgarage/3rdparty/lapack/sgetrf.c
Compile thumb : opencv_lapack <= /home/florian/android-opencv-willowgarage/3rdparty/lapack/scopy.c
Compile++ thumb: opencv_core <= /home/florian/android-opencv-willowgarage/modules/core/src/matrix.cpp
cc1plus: error: /home/florian/android-opencv-willowgarage/android/../modules/index.rst/include: Not a directory
make[3]: *** [/home/florian/android-opencv-willowgarage/android/build/obj/local/armeabi/objs/opencv_core/src/matrix.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [android-opencv] Error 2
make[1]: *** [CMakeFiles/ndk.dir/all] Error 2
make: *** [all] Error 2
有人知道这意味着什么吗？
答案 0 :(得分：0)
我刚在Linux上使用ndk-r5b构建它。您的项目目录（不是default.properties）中是否有jni文件，其中包含以下内容：
target=android-8
如果没有，您可以尝试创建并重新构建。
答案 1 :(得分：0)
在cygwin的情况下，标准的gcc spec文件包含-dll-search-prefix = cyg，所以实际上我们实际上是在搜索cygxxx.dll。 （不适用于libcxcore.a）因此，您需要将libxxx.a复制到cygxxx.a并将它们放在一些可用于链接器目录的位置。 我在http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/4/html/Using_ld_the_GNU_Linker/win32.html
找到了这个解决方案