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POOpenCV, link error in XCode, Undefined symbols for architecture x86_64: "_cvHaarDetectObjects", referenced from: _main in main.o
 

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  1. POOpenCV, link error in XCode, Undefined symbols for architecture x86_64: "_cvHaarDetectObjects", referenced from: _main in main.o
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    <p>I'm trying to use openCV (v 2.4.6) for macOSX (v 10.7.4) with Xcode (v 4.6.2).</p> <p>I've installed the library correctly (I guess, I haven't got any error so...) with cmake, after installation I've start a test project to render an image with success (following <a href="http://sadeepj.blogspot.it/2012/03/installing-and-configuring-opencv-to.html" rel="nofollow">this tutorial</a> for installation and test project):</p> <pre><code>#include &lt;iostream&gt; #include &lt;opencv2/opencv.hpp&gt; using namespace std; using namespace cv; int main (int argc, const char * argv[]) { Mat img = imread("/Users/username/path/image.jpg"); if (img.data == 0) { cerr &lt;&lt; "Image not found!" &lt;&lt; endl; return -1; } namedWindow("image", CV_WINDOW_AUTOSIZE); imshow("image", img); waitKey(); } </code></pre> <p>After this i've used code from an example found in the openCV library to do some more interesting with my test project (it should be a facetracker)</p> <pre><code>#include &lt;opencv2/opencv.hpp&gt; #include &lt;CoreFoundation/CoreFoundation.h&gt; #include &lt;cassert&gt; #include &lt;iostream&gt; const char * WINDOW_NAME = "Face Tracker"; const CFIndex CASCADE_NAME_LEN = 2048; char CASCADE_NAME[CASCADE_NAME_LEN] = "/Users/username/path/opencv/data/haarcascades/haarcascade_frontalface_alt2.xml"; using namespace std; int main (int argc, char * const argv[]) { const int scale = 2; // locate haar cascade from inside application bundle // (this is the mac way to package application resources) CFBundleRef mainBundle = CFBundleGetMainBundle (); assert(mainBundle); CFURLRef cascade_url = CFBundleCopyResourceURL (mainBundle, CFSTR("haarcascade_frontalface_alt2"), CFSTR("xml"), NULL); assert(cascade_url); Boolean got_it = CFURLGetFileSystemRepresentation (cascade_url, true, reinterpret_cast&lt;UInt8 *&gt;(CASCADE_NAME),CASCADE_NAME_LEN); if (! got_it) abort (); // create all necessary instances cvNamedWindow (WINDOW_NAME, CV_WINDOW_AUTOSIZE); CvCapture * camera = cvCreateCameraCapture (CV_CAP_ANY); CvHaarClassifierCascade* cascade = (CvHaarClassifierCascade*) cvLoad (CASCADE_NAME, 0, 0, 0); CvMemStorage* storage = cvCreateMemStorage(0); assert (storage); // you do own an iSight, don't you ?!? if (! camera) abort (); // did we load the cascade?!? if (! cascade) abort (); // get an initial frame and duplicate it for later work IplImage * current_frame = cvQueryFrame (camera); IplImage * draw_image = cvCreateImage(cvSize (current_frame-&gt;width, current_frame-&gt;height), IPL_DEPTH_8U, 3); IplImage * gray_image = cvCreateImage(cvSize (current_frame-&gt;width, current_frame-&gt;height), IPL_DEPTH_8U, 1); IplImage * small_image = cvCreateImage(cvSize (current_frame-&gt;width / scale, current_frame-&gt;height / scale), IPL_DEPTH_8U, 1); assert (current_frame &amp;&amp; gray_image &amp;&amp; draw_image); // as long as there are images ... while ((current_frame = cvQueryFrame (camera))) { // convert to gray and downsize cvCvtColor (current_frame, gray_image, CV_BGR2GRAY); cvResize (gray_image, small_image, CV_INTER_LINEAR); // detect faces CvSeq* faces = cvHaarDetectObjects (small_image, cascade, storage, 1.1, 2, CV_HAAR_DO_CANNY_PRUNING, cvSize (30, 30)); // draw faces cvFlip (current_frame, draw_image, 1); for (int i = 0; i &lt; (faces ? faces-&gt;total : 0); i++) { CvRect* r = (CvRect*) cvGetSeqElem (faces, i); CvPoint center; int radius; center.x = cvRound((small_image-&gt;width - r-&gt;width*0.5 - r-&gt;x) *scale); center.y = cvRound((r-&gt;y + r-&gt;height*0.5)*scale); radius = cvRound((r-&gt;width + r-&gt;height)*0.25*scale); cvCircle (draw_image, center, radius, CV_RGB(0,255,0), 3, 8, 0 ); } // just show the image cvShowImage (WINDOW_NAME, draw_image); // wait a tenth of a second for keypress and window drawing int key = cvWaitKey (100); if (key == 'q' || key == 'Q') break; } // be nice and return no error return 0; } </code></pre> <p>This time there's something wrong, this is the error:</p> <pre><code>Ld /Users/winimac01/Library/Developer/Xcode/DerivedData/OpenCVDemo-cgklqgeatrdcvahjmnlypuyzqich/Build/Products/Debug/OpenCVDemo normal x86_64 cd /Users/winimac01/Desktop/IOSapp/sviluppo/OpenCVDemo setenv MACOSX_DEPLOYMENT_TARGET 10.7 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -L/Users/winimac01/Library/Developer/Xcode/DerivedData/OpenCVDemo-cgklqgeatrdcvahjmnlypuyzqich/Build/Products/Debug -F/Users/winimac01/Library/Developer/Xcode/DerivedData/OpenCVDemo-cgklqgeatrdcvahjmnlypuyzqich/Build/Products/Debug -filelist /Users/winimac01/Library/Developer/Xcode/DerivedData/OpenCVDemo-cgklqgeatrdcvahjmnlypuyzqich/Build/Intermediates/OpenCVDemo.build/Debug/OpenCVDemo.build/Objects-normal/x86_64/OpenCVDemo.LinkFileList -mmacosx-version-min=10.7 -lopencv_core -lopencv_highgui -lopencv_imgproc -stdlib=libstdc++ -framework CoreFoundation -lopencv_core.2.4.6 -lopencv_highgui.2.4.6 -o /Users/winimac01/Library/Developer/Xcode/DerivedData/OpenCVDemo-cgklqgeatrdcvahjmnlypuyzqich/Build/Products/Debug/OpenCVDemo Undefined symbols for architecture x86_64: "_cvHaarDetectObjects", referenced from: _main in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) </code></pre> <p>Any ideas?</p> <p><strong>edit1:</strong></p> <p>Some info from Build Settings:</p> <pre><code>Architectures: 64-bit Intel Base SDK Latest: OSx (OSX 10.8) Valid Architectures: i386 x86_64 Other Linker Flags: none C Language Dialect: GNU99 [-std=gnu99] C++ Language Dialect: GNU++11 [-std=gnu++11] C++ Standard Library: libc++ (LLVM C++ standard library with C++) </code></pre> <p><strong>edit 2:</strong></p> <p>something interesting, compiling by terminal with </p> <pre><code>g++ `pkg-config --cflags --libs opencv` main.cpp </code></pre> <p>I receive this errors:</p> <pre><code>Package opencv was not found in the pkg-config search path. Perhaps you should add the directory containing `opencv.pc' to the PKG_CONFIG_PATH environment variable No package 'opencv' found Undefined symbols for architecture x86_64: "_CFBundleCopyResourceURL", referenced from: _main in cc6OpS79.o "_CFBundleGetMainBundle", referenced from: _main in cc6OpS79.o "_CFURLGetFileSystemRepresentation", referenced from: _main in cc6OpS79.o "___CFConstantStringClassReference", referenced from: CFString in cc6OpS79.o CFString in cc6OpS79.o "_cvCircle", referenced from: _main in cc6OpS79.o "_cvCreateCameraCapture", referenced from: _main in cc6OpS79.o "_cvCreateImage", referenced from: _main in cc6OpS79.o "_cvCreateMemStorage", referenced from: _main in cc6OpS79.o "_cvCvtColor", referenced from: _main in cc6OpS79.o "_cvFlip", referenced from: _main in cc6OpS79.o "_cvGetSeqElem", referenced from: _main in cc6OpS79.o "_cvHaarDetectObjects", referenced from: _main in cc6OpS79.o "_cvLoad", referenced from: _main in cc6OpS79.o "_cvNamedWindow", referenced from: _main in cc6OpS79.o "_cvQueryFrame", referenced from: _main in cc6OpS79.o "_cvResize", referenced from: _main in cc6OpS79.o "_cvShowImage", referenced from: _main in cc6OpS79.o "_cvWaitKey", referenced from: _main in cc6OpS79.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status </code></pre>
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