<h5 dir="auto">System information (version)</h5>
<ul dir="auto">
<li>OpenCV =&gt; 4.5.5</li>
<li>Operating System / Platform =&gt; MacOS Catalina 10.15.7</li>
<li>Compiler =&gt; clang, xcode</li>
</ul>
<h5 dir="auto">Detailed description</h5>
<p dir="auto">I tried to install OpenCV from scratch but it failed to finish successfully. I had to install opencv from scratch because Java support is required. I used CMake gui app to generate build files and then 'make -j'</p>
<p dir="auto">I had an issue with zlib. I used homebrew zlib instead of integrated one, but it did not succeed</p>
<p dir="auto">Maybe it is related to <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="1093880145" data-permission-text="Title is private" data-url="https://github.com/opencv/opencv/issues/21389" data-hovercard-type="issue" data-hovercard-url="/opencv/opencv/issues/21389/hovercard" href="https://github.com/opencv/opencv/issues/21389">#21389</a></p>
<h5 dir="auto">Error</h5>
<p dir="auto">Undefined symbols for architecture x86_64:<br>
"Imf_3_1::Header::Header(int, int, float, Imath_2_5::Vec2 const&amp;, float, Imf_3_1::LineOrder, Imf_3_1::Compression)", referenced from:<br>
cv::ExrEncoder::write(cv::Mat const&amp;, std::__1::vector&lt;int, std::__1::allocator &gt; const&amp;) in grfmt_exr.cpp.o<br>
"Imf_3_1::Chromaticities::Chromaticities(Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;)", referenced from:<br>
cv::ExrDecoder::ExrDecoder() in grfmt_exr.cpp.o<br>
ld: symbol(s) not found for architecture x86_64</p>
<h5 dir="auto">Steps to reproduce (Full log)</h5>
<p dir="auto">Igors-MacBook-Pro opencv-4.5.5_build % make -j -B<br>
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[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/utils/filesystem.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/utils/logtagconfigparser.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/utils/logtagmanager.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/utils/samples.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/va_intel.cpp.o<br>
[ 28%] Processing OpenCL kernels (core)<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/stat.sse4_2.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/mathfuncs_core.avx.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/mathfuncs_core.avx2.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/stat.avx2.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/arithm.avx2.cpp.o<br>
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/convert.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/convert_scale.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/count_non_zero.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/matmul.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/mean.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/merge.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/split.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/sum.avx2.cpp.o<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/matmul.avx512_skx.cpp.o<br>
-- /Users/igla/Downloads/opencv-4.5.5_build/modules/core/opencl_kernels_core.hpp contains the same content<br>
[ 29%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/opencl_kernels_core.cpp.o<br>
[ 29%] Linking C static library ../lib/liblibpng.a<br>
[ 29%] Built target libpng<br>
[ 30%] Linking CXX static library ../lib/liblibtiff.a<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_jbig.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_jpeg_12.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_lzma.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_ojpeg.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_pixarlog.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_webp.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_zstd.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_jbig.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_jpeg_12.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_lzma.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_ojpeg.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_pixarlog.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_webp.c.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibtiff.a(tif_zstd.c.o) has no symbols<br>
[ 30%] Built target libtiff<br>
[ 30%] Built target gen_opencv_python_source<br>
SKIP:AsyncArray cv::dnn::Net::forwardAsync(String outputName = String())	 due to RET type AsyncArray<br>
SKIP:void cv::dnn::Net::forward(vector_vector_Mat&amp; outputBlobs, vector_String outBlobNames)	 due to ARG type vector_vector_Mat/O<br>
SKIP:void cv::dnn::Net::getLayersShapes(vector_MatShape netInputShapes, vector_int&amp; layersIds, vector_vector_MatShape&amp; inLayersShapes, vector_vector_MatShape&amp; outLayersShapes)	 due to ARG type vector_vector_MatShape/O<br>
SKIP:void cv::dnn::Net::getLayersShapes(MatShape netInputShape, vector_int&amp; layersIds, vector_vector_MatShape&amp; inLayersShapes, vector_vector_MatShape&amp; outLayersShapes)	 due to ARG type vector_vector_MatShape/O<br>
/Users/igla/Downloads/opencv-4.5.5/modules/java/generator/../generator/gen_java.py:578: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal<br>
if content == buf:<br>
SKIP:cv::BOWImgDescriptorExtractor::BOWImgDescriptorExtractor(Ptr_DescriptorExtractor dextractor, Ptr_DescriptorMatcher dmatcher)	 due to ARG type Ptr_DescriptorExtractor/I<br>
SKIP:void cv::DescriptorMatcher::read(FileNode arg1)	 due to ARG type FileNode/I<br>
SKIP:void cv::DescriptorMatcher::write(Ptr_FileStorage fs, String name = String())	 due to ARG type Ptr_FileStorage/I<br>
SKIP:void cv::Feature2D::read(FileNode arg1)	 due to ARG type FileNode/I<br>
SKIP:void cv::Feature2D::write(Ptr_FileStorage fs, String name = String())	 due to ARG type Ptr_FileStorage/I<br>
SKIP:uchar SimpleBlobDetector_Params::blobColor	 due to RET type uchar<br>
SKIP:void SimpleBlobDetector_Params::blobColor	 due to ARG type uchar/I<br>
SKIP:vector_VideoCaptureAPIs cv::videoio_registry::getBackends()	 due to RET type vector_VideoCaptureAPIs<br>
SKIP:vector_VideoCaptureAPIs cv::videoio_registry::getCameraBackends()	 due to RET type vector_VideoCaptureAPIs<br>
SKIP:vector_VideoCaptureAPIs cv::videoio_registry::getStreamBackends()	 due to RET type vector_VideoCaptureAPIs<br>
SKIP:vector_VideoCaptureAPIs cv::videoio_registry::getWriterBackends()	 due to RET type vector_VideoCaptureAPIs<br>
SKIP:bool cv::findCirclesGrid(Mat image, Size patternSize, Mat&amp; centers, int flags, Ptr_FeatureDetector blobDetector, CirclesGridFinderParameters parameters)	 due to ARG type Ptr_FeatureDetector/I<br>
SKIP:bool cv::CascadeClassifier::read(FileNode node)	 due to ARG type FileNode/I<br>
SKIP:CorrectionLevel QRCodeEncoder_Params::correction_level	 due to RET type CorrectionLevel<br>
SKIP:void QRCodeEncoder_Params::correction_level	 due to ARG type CorrectionLevel/I<br>
SKIP:EncodeMode QRCodeEncoder_Params::mode	 due to RET type EncodeMode<br>
SKIP:void QRCodeEncoder_Params::mode	 due to ARG type EncodeMode/I<br>
Generated files: 241 (updated 2)<br>
[ 30%] Built target gen_opencv_java_source<br>
[ 30%] Copy Java(JAR) source files<br>
[ 30%] Copying res/drawable/chessboard.jpg<br>
[ 31%] Copying res/drawable/icon.png<br>
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[ 31%] Copying res/values/strings.xml<br>
[ 31%] Copying src/org/opencv/test/utils/ConvertersTest.java<br>
COPYFILES: ... 1 entries (JAVA_SRC_COPY)<br>
COPYFILES:     ... directory '.../gen/java' with 146 files<br>
COPYFILES:         Copying: 'modules/java/jar/opencv/java/org/opencv/calib3d/Calib3d.java' ...<br>
[ 31%] Copy Java(Test) source files<br>
COPYFILES: ... 1 entries (JAVA_TEST_SRC_COPY)<br>
COPYFILES:     ... directory '.../gen/test' with 55 files<br>
COPYFILES: All files are up-to-date.<br>
[ 31%] Built target opencv_java_test_source_copy<br>
COPYFILES:         Copying: 'modules/java/jar/opencv/java/org/opencv/features2d/AKAZE.java' ...<br>
COPYFILES: Updated!<br>
[ 31%] Built target opencv_java_jar_source_copy<br>
[ 31%] Copy Java(JAR) source files<br>
COPYFILES: ... 1 entries (JAVA_SRC_COPY)<br>
COPYFILES:     ... directory '.../gen/java' with 146 files<br>
COPYFILES: All files are up-to-date.<br>
[ 31%] Generating opencv-455.jar<br>
[ 31%] Built target opencv_java_jar<br>
[ 31%] Linking C static library ../lib/liblibjpeg-turbo.a<br>
[ 31%] Built target libjpeg-turbo<br>
[ 31%] Linking C static library ../../lib/liblibopenjp2.a<br>
[ 31%] Linking CXX static library 3rdparty/lib/libade.a<br>
[ 31%] Built target libopenjp2<br>
[ 31%] Built target ade<br>
[ 31%] Linking CXX static library ../lib/liblibprotobuf.a<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibprotobuf.a(io_win32.cc.o) has no symbols<br>
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../lib/liblibprotobuf.a(io_win32.cc.o) has no symbols<br>
[ 31%] Built target libprotobuf<br>
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[ 31%] Built target opencv_core<br>
[ 32%] Building CXX object apps/version/CMakeFiles/opencv_version.dir/opencv_version.cpp.o<br>
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[ 32%] Building CXX object modules/ml/CMakeFiles/opencv_ml.dir/src/boost.cpp.o<br>
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-- /Users/igla/Downloads/opencv-4.5.5_build/modules/imgproc/opencl_kernels_imgproc.hpp contains the same content<br>
Scanning dependencies of target opencv_imgproc<br>
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[ 35%] Building CXX object modules/imgproc/CMakeFiles/opencv_imgproc.dir/src/imgwarp.cpp.o<br>
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[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/src/vkcom/src/op_relu.cpp.o<br>
[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/src/vkcom/src/op_softmax.cpp.o<br>
[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/src/vkcom/src/tensor.cpp.o<br>
[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/src/vkcom/vulkan/vk_functions.cpp.o<br>
[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/src/vkcom/vulkan/vk_loader.cpp.o<br>
[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/layers/layers_common.avx.cpp.o<br>
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[ 48%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/evaluation.cpp.o<br>
[ 48%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/fast.cpp.o<br>
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[ 48%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/gftt.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/kaze.cpp.o<br>
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[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/kaze/nldiffusion_functions.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/keypoint.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/main.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/matchers.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/mser.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/orb.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/sift.dispatch.cpp.o<br>
[ 49%] Processing OpenCL kernels (features2d)<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/fast.avx2.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/sift.avx2.cpp.o<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/sift.avx512_skx.cpp.o<br>
-- /Users/igla/Downloads/opencv-4.5.5_build/modules/features2d/opencl_kernels_features2d.hpp contains the same content<br>
[ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/opencl_kernels_features2d.cpp.o<br>
[ 50%] Linking CXX shared library ../../lib/libopencv_features2d.dylib<br>
[ 50%] Linking CXX shared library ../../lib/libopencv_imgcodecs.dylib<br>
<strong>Undefined symbols for architecture x86_64:<br>
"Imf_3_1::Header::Header(int, int, float, Imath_2_5::Vec2 const&amp;, float, Imf_3_1::LineOrder, Imf_3_1::Compression)", referenced from:<br>
cv::ExrEncoder::write(cv::Mat const&amp;, std::__1::vector&lt;int, std::__1::allocator &gt; const&amp;) in grfmt_exr.cpp.o<br>
"Imf_3_1::Chromaticities::Chromaticities(Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;)", referenced from:<br>
cv::ExrDecoder::ExrDecoder() in grfmt_exr.cpp.o<br>
ld: symbol(s) not found for architecture x86_64</strong><br>
clang: error: linker command failed with exit code 1 (use -v to see invocation)<br>
make[2]: *** [lib/libopencv_imgcodecs.4.5.5.dylib] Error 1<br>
make[1]: *** [modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all] Error 2<br>
make[1]: *** Waiting for unfinished jobs....<br>
[ 50%] Built target opencv_features2d<br>
[ 50%] Linking CXX shared library ../../lib/libopencv_photo.dylib<br>
[ 50%] Built target opencv_photo<br>
[ 51%] Linking CXX shared library ../../lib/libopencv_dnn.dylib<br>
[ 51%] Built target opencv_dnn<br>
make: *** [all] Error 2<br>
igla@Igors-MacBook-Pro opencv-4.5.5_build % make -j<br>
[  1%] Built target quirc<br>
[  1%] Built target ittnotify<br>
[  1%] Built target opencv_videoio_plugins<br>
[  2%] Built target libpng<br>
[  2%] Built target gen_opencv_python_source<br>
[  3%] Built target ade<br>
[  3%] Built target gen_opencv_java_source<br>
[  6%] Built target libtiff<br>
[  6%] Built target opencv_highgui_plugins<br>
[  8%] Built target ippiw<br>
[ 11%] Built target libjpeg-turbo<br>
[ 14%] Built target libprotobuf<br>
[ 21%] Built target libwebp<br>
[ 23%] Built target libopenjp2<br>
[ 23%] Copy Java(Test) source files<br>
[ 23%] Built target opencv_java_jar_source_copy<br>
COPYFILES: ... 1 entries (JAVA_TEST_SRC_COPY)<br>
COPYFILES:     ... directory '.../gen/test' with 55 files<br>
[ 23%] Generating opencv-455.jar<br>
COPYFILES: All files are up-to-date.<br>
[ 23%] Built target opencv_java_jar<br>
[ 24%] Built target opencv_java_test_source_copy<br>
[ 31%] Built target opencv_core<br>
[ 32%] Built target opencv_version<br>
[ 32%] Built target opencv_flann<br>
[ 33%] Built target opencv_ml<br>
[ 38%] Built target opencv_imgproc<br>
[ 39%] Built target opencv_photo<br>
[ 39%] Linking CXX shared library ../../lib/libopencv_imgcodecs.dylib<br>
[ 47%] Built target opencv_dnn<br>
[ 49%] Built target opencv_features2d<br>
[ 49%] Linking CXX executable ../../bin/opencv_model_diagnostics<br>
[ 49%] Built target opencv_model_diagnostics<br>
Undefined symbols for architecture x86_64:<br>
"Imf_3_1::Header::Header(int, int, float, Imath_2_5::Vec2 const&amp;, float, Imf_3_1::LineOrder, Imf_3_1::Compression)", referenced from:<br>
cv::ExrEncoder::write(cv::Mat const&amp;, std::__1::vector&lt;int, std::__1::allocator &gt; const&amp;) in grfmt_exr.cpp.o<br>
"Imf_3_1::Chromaticities::Chromaticities(Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;, Imath_2_5::Vec2 const&amp;)", referenced from:<br>
cv::ExrDecoder::ExrDecoder() in grfmt_exr.cpp.o<br>
ld: symbol(s) not found for architecture x86_64<br>
clang: error: linker command failed with exit code 1 (use -v to see invocation)<br>
make[2]: *** [lib/libopencv_imgcodecs.4.5.5.dylib] Error 1<br>
make[1]: *** [modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all] Error 2<br>
make[1]: *** Waiting for unfinished jobs....<br>
[ 49%] Linking CXX shared library ../../lib/libopencv_calib3d.dylib<br>
[ 52%] Built target opencv_calib3d</p>
<h5 dir="auto">System information (version)</h5>
<ul dir="auto">
<li>OpenCV =&gt; 4.0.0 beta</li>
<li>Operating System / Platform =&gt; Windows 7 64 Bit</li>
<li>Compiler =&gt; Visual Studio 2015  build tool   with cmake and nmake</li>
</ul>
<h5 dir="auto">Detailed description</h5>
<p dir="auto">compilation fails</p>
<p dir="auto">the earliest fail i've forgot the scene,<br>
it was in file "modules\cudaoptflow\src\farneback.cpp"<br>
in line 48 ,the FarnebackOpticalFlow was reported by compiler to be ambiguous<br>
i removed these code since the code was in #if !defined HAVE_CUDA || defined(CUDA_DISABLER) and i will use cuda</p>
<p dir="auto">in file   "modules\stitching\src\blenders.cpp"<br>
in line 40 or somewhere the namespace   cv::cuda::device::blend don't exist.  Obviously the #ifdef HAVE_CUDA did not work.<br>
i modified it by removing the #ifdef  , expose the code to the outer, for the same reason since i will use cuda<br>
it worked</p>
<p dir="auto">problem continues and maybe worse:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="[ 88%] Linking CXX executable ..\..\bin\opencv_perf_cudaoptflow.exe

perf_optflow.cpp.obj : error LNK2019: unresolved external symbol 

&quot;public: static struct cv::Ptr&lt;class cv::cuda::FarnebackOpticalFlow&gt; __cdecl cv::cuda::FarnebackOpticalFlow::create(int,double,bool,int,int,int,double,int)&quot; 

(?create@FarnebackOpticalFlow@cuda@cv@@SA?AU?$Ptr@VFarnebackOpticalFlow@cuda@cv@@@3@HN_NHHHNH@Z) 

referenced in function 

&quot;protected: virtual void __cdecl
opencv_test::`anonymous namespace'::ImagePair_FarnebackOpticalFlow::PerfTestBody(void)&quot; (?PerfTestBody@ImagePair_FarnebackOpticalFlow@?A0x63873ea8@opencv_test@@MEAAXXZ)

..\..\bin\opencv_perf_cudaoptflow.exe : fatal error LNK1120: 1 unresolved externals
LINK failed. with 1120
NMAKE : fatal error U1077: '&quot;C:\Program Files\cmake\bin\cmake.exe&quot;' : return code '0xffffffff'
Stop.
NMAKE : fatal error U1077: '&quot;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe&quot;' : return code '0x2'

Stop.
NMAKE : fatal error U1077: '&quot;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe&quot;' : return code '0x2'

Stop."><pre class="notranslate"><code class="notranslate">[ 88%] Linking CXX executable ..\..\bin\opencv_perf_cudaoptflow.exe

perf_optflow.cpp.obj : error LNK2019: unresolved external symbol 

"public: static struct cv::Ptr&lt;class cv::cuda::FarnebackOpticalFlow&gt; __cdecl cv::cuda::FarnebackOpticalFlow::create(int,double,bool,int,int,int,double,int)" 

(?create@FarnebackOpticalFlow@cuda@cv@@SA?AU?$Ptr@VFarnebackOpticalFlow@cuda@cv@@@3@HN_NHHHNH@Z) 

referenced in function 

"protected: virtual void __cdecl
opencv_test::`anonymous namespace'::ImagePair_FarnebackOpticalFlow::PerfTestBody(void)" (?PerfTestBody@ImagePair_FarnebackOpticalFlow@?A0x63873ea8@opencv_test@@MEAAXXZ)

..\..\bin\opencv_perf_cudaoptflow.exe : fatal error LNK1120: 1 unresolved externals
LINK failed. with 1120
NMAKE : fatal error U1077: '"C:\Program Files\cmake\bin\cmake.exe"' : return code '0xffffffff'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'

Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'

Stop.
</code></pre></div>
<p dir="auto">i re-run cmake, unchecked perf-test, and rerun nmake</p>
<p dir="auto">the perf_cudaoptflow.exe was "avoided", but bug was not fixed, i got this soon:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="----------------------------------------------------------------------------------
[ 94%] Linking CXX shared library ..\..\bin\opencv_stitching400.dll
   Creating library ..\..\lib\opencv_stitching400.lib and object ..\..\lib\opencv_stitching400.exp
blenders.cpp.obj : error LNK2019: unresolved external symbol &quot;void __cdecl cv::cuda::device::blend::addSrcWeightGpu16S(struct
 cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,cla
ss cv::Rect_&lt;int&gt; &amp;)&quot; (?addSrcWeightGpu16S@blend@device@cuda@cv@@YAXU?$PtrStep@F@34@0U534@1AEAV?$Rect_@H@4@@Z) referenced in
function &quot;public: virtual void __cdecl cv::detail::MultiBandBlender::feed(class cv::_InputArray const &amp;,class cv::_InputArray
 const &amp;,class cv::Point_&lt;int&gt;)&quot; (?feed@MultiBandBlender@detail@cv@@UEAAXAEBV_InputArray@3@0V?$Point_@H@3@@Z)
blenders.cpp.obj : error LNK2019: unresolved external symbol &quot;void __cdecl cv::cuda::device::blend::addSrcWeightGpu32F(struct
 cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;float&gt;,struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;float&gt;,cla
ss cv::Rect_&lt;int&gt; &amp;)&quot; (?addSrcWeightGpu32F@blend@device@cuda@cv@@YAXU?$PtrStep@F@34@U?$PtrStep@M@34@U534@U634@AEAV?$Rect_@H@4
@@Z) referenced in function &quot;public: virtual void __cdecl cv::detail::MultiBandBlender::feed(class cv::_InputArray const &amp;,cl
ass cv::_InputArray const &amp;,class cv::Point_&lt;int&gt;)&quot; (?feed@MultiBandBlender@detail@cv@@UEAAXAEBV_InputArray@3@0V?$Point_@H@3@
@Z)
blenders.cpp.obj : error LNK2019: unresolved external symbol &quot;void __cdecl cv::cuda::device::blend::normalizeUsingWeightMapGp
u16S(struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,int,int)&quot; (?normalizeUsingWeightMapGpu16S@blend@device@c
uda@cv@@YAXU?$PtrStep@F@34@U534@HH@Z) referenced in function &quot;public: virtual void __cdecl cv::detail::MultiBandBlender::blen
d(class cv::_InputOutputArray const &amp;,class cv::_InputOutputArray const &amp;)&quot; (?blend@MultiBandBlender@detail@cv@@UEAAXAEBV_Inp
utOutputArray@3@0@Z)
blenders.cpp.obj : error LNK2019: unresolved external symbol &quot;void __cdecl cv::cuda::device::blend::normalizeUsingWeightMapGp
u32F(struct cv::cuda::PtrStep&lt;float&gt;,struct cv::cuda::PtrStep&lt;short&gt;,int,int)&quot; (?normalizeUsingWeightMapGpu32F@blend@device@c
uda@cv@@YAXU?$PtrStep@M@34@U?$PtrStep@F@34@HH@Z) referenced in function &quot;public: virtual void __cdecl cv::detail::MultiBandBl
ender::blend(class cv::_InputOutputArray const &amp;,class cv::_InputOutputArray const &amp;)&quot; (?blend@MultiBandBlender@detail@cv@@UE
AAXAEBV_InputOutputArray@3@0@Z)
..\..\bin\opencv_stitching400.dll : fatal error LNK1120: 4 unresolved externals
LINK failed. with 1120
NMAKE : fatal error U1077: '&quot;C:\Program Files\cmake\bin\cmake.exe&quot;' : return code '0xffffffff'
Stop.
NMAKE : fatal error U1077: '&quot;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe&quot;' : return code '0x2'

Stop.
NMAKE : fatal error U1077: '&quot;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe&quot;' : return code '0x2'

Stop."><pre class="notranslate"><code class="notranslate">----------------------------------------------------------------------------------
[ 94%] Linking CXX shared library ..\..\bin\opencv_stitching400.dll
   Creating library ..\..\lib\opencv_stitching400.lib and object ..\..\lib\opencv_stitching400.exp
blenders.cpp.obj : error LNK2019: unresolved external symbol "void __cdecl cv::cuda::device::blend::addSrcWeightGpu16S(struct
 cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,cla
ss cv::Rect_&lt;int&gt; &amp;)" (?addSrcWeightGpu16S@blend@device@cuda@cv@@YAXU?$PtrStep@F@34@0U534@1AEAV?$Rect_@H@4@@Z) referenced in
function "public: virtual void __cdecl cv::detail::MultiBandBlender::feed(class cv::_InputArray const &amp;,class cv::_InputArray
 const &amp;,class cv::Point_&lt;int&gt;)" (?feed@MultiBandBlender@detail@cv@@UEAAXAEBV_InputArray@3@0V?$Point_@H@3@@Z)
blenders.cpp.obj : error LNK2019: unresolved external symbol "void __cdecl cv::cuda::device::blend::addSrcWeightGpu32F(struct
 cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;float&gt;,struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;float&gt;,cla
ss cv::Rect_&lt;int&gt; &amp;)" (?addSrcWeightGpu32F@blend@device@cuda@cv@@YAXU?$PtrStep@F@34@U?$PtrStep@M@34@U534@U634@AEAV?$Rect_@H@4
@@Z) referenced in function "public: virtual void __cdecl cv::detail::MultiBandBlender::feed(class cv::_InputArray const &amp;,cl
ass cv::_InputArray const &amp;,class cv::Point_&lt;int&gt;)" (?feed@MultiBandBlender@detail@cv@@UEAAXAEBV_InputArray@3@0V?$Point_@H@3@
@Z)
blenders.cpp.obj : error LNK2019: unresolved external symbol "void __cdecl cv::cuda::device::blend::normalizeUsingWeightMapGp
u16S(struct cv::cuda::PtrStep&lt;short&gt;,struct cv::cuda::PtrStep&lt;short&gt;,int,int)" (?normalizeUsingWeightMapGpu16S@blend@device@c
uda@cv@@YAXU?$PtrStep@F@34@U534@HH@Z) referenced in function "public: virtual void __cdecl cv::detail::MultiBandBlender::blen
d(class cv::_InputOutputArray const &amp;,class cv::_InputOutputArray const &amp;)" (?blend@MultiBandBlender@detail@cv@@UEAAXAEBV_Inp
utOutputArray@3@0@Z)
blenders.cpp.obj : error LNK2019: unresolved external symbol "void __cdecl cv::cuda::device::blend::normalizeUsingWeightMapGp
u32F(struct cv::cuda::PtrStep&lt;float&gt;,struct cv::cuda::PtrStep&lt;short&gt;,int,int)" (?normalizeUsingWeightMapGpu32F@blend@device@c
uda@cv@@YAXU?$PtrStep@M@34@U?$PtrStep@F@34@HH@Z) referenced in function "public: virtual void __cdecl cv::detail::MultiBandBl
ender::blend(class cv::_InputOutputArray const &amp;,class cv::_InputOutputArray const &amp;)" (?blend@MultiBandBlender@detail@cv@@UE
AAXAEBV_InputOutputArray@3@0@Z)
..\..\bin\opencv_stitching400.dll : fatal error LNK1120: 4 unresolved externals
LINK failed. with 1120
NMAKE : fatal error U1077: '"C:\Program Files\cmake\bin\cmake.exe"' : return code '0xffffffff'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'

Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'

Stop.
</code></pre></div>
<p dir="auto">i did not dive into code yet, was this encountered yet or was it only my fault???</p>
<h5 dir="auto">Steps to reproduce</h5>
<p dir="auto">the real problem was "unresolved external symbol"</p>