CODEWITHSUNDEEP
c++xcodemacosopencv
Eduardo Reis
Eduardo Reis

Reputation: 1971

Linking OpenCV to XCode

I'm following this: http://sadeepj.blogspot.com.br/2012/03/installing-and-configuring-opencv-to.html

I had a problem, compiling. But I already fixed it, modifying 2 files...

Now I'm trying to run that example.

And I get this error message:

Ld /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug/DemoOpenCV2 normal x86_64 cd /Users/eduardoreis/Documents/XCodeDevelopment/DemoOpenCV2 setenv MACOSX_DEPLOYMENT_TARGET 10.8 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -L/Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug -F/Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug -filelist /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Intermediates/DemoOpenCV2.build/Debug/DemoOpenCV2.build/Objects-normal/x86_64/DemoOpenCV2.LinkFileList -mmacosx-version-min=10.8 -stdlib=libc++ -lopencv_core.2.4.6 -lopencv_highgui.2.4.6 -Xlinker -dependency_info -Xlinker /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Intermediates/DemoOpenCV2.build/Debug/DemoOpenCV2.build/Objects-normal/x86_64/DemoOpenCV2_dependency_info.dat -o /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug/DemoOpenCV2

ld: library not found for -lopencv_core.2.4.6 clang: error: linker command failed with exit code 1 (use -v to see invocation)

I follows all steps already. And I can't even build it. Please, help me.

[Before someone says that it is a duplicated post, I know it, here is the original one: C++ linker errors with OpenCV. I'm sorry. But I can't even comment on that one :/ ]

Upvotes: 0

Views: 4761

Answers (1)

Eduardo Reis
Eduardo Reis

Reputation: 1971

Wow, Finally solved:

Some considerations:

  • Realize that even it is looking for -l opencv_core.2.4.6, the compiler will get the right file, if it is added correctly with other name, in this case libopencv_core.2.4.dylib
  • I was adding the files with Project>Add files to... and then creating a group and dragging the files into the group. This was messing up the linkings in Project>Link Binary with Libraries. So I had to do it again by dragging the files in the group into that spot.

After theses things I had the situation where I had the two files (core and highgui) and 4 errors:

Ld /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug/DemoOpenCV2 normal x86_64 cd /Users/eduardoreis/Documents/XCodeDevelopment/DemoOpenCV2 setenv MACOSX_DEPLOYMENT_TARGET 10.8 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -L/Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug -L/Users/eduardoreis/Downloads/opencv-2.4.6.1/build/lib/Debug -L/usr/local/lib/python2.7/site-packages -L/usr/local/lib/python2.7/site-packages/PyQt4 -L/usr/local/lib/wine -L/usr/local/Cellar/wine/1.4.1/lib -L/usr/local/Cellar/qt/4.8.5/lib -L/usr/local/Cellar/qscintilla2/2.7.1/lib -L/usr/local/Cellar/libicns/0.8.1/lib -L/usr/local/Cellar/jasper/1.900.1/lib -L/usr/local/Cellar/jpeg/8d/lib -L/usr/local/Cellar/little-cms/1.19/lib -L/usr/local/Cellar/libpng/1.5.14/lib -L/usr/local/Cellar/libtiff/4.0.3/lib -F/Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug -F/usr/local/lib -filelist /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Intermediates/DemoOpenCV2.build/Debug/DemoOpenCV2.build/Objects-normal/x86_64/DemoOpenCV2.LinkFileList -mmacosx-version-min=10.8 -stdlib=libc++ -lopencv_core.2.4 -lopencv_highgui.2.4 -Xlinker -dependency_info -Xlinker /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Intermediates/DemoOpenCV2.build/Debug/DemoOpenCV2.build/Objects-normal/x86_64/DemoOpenCV2_dependency_info.dat -o /Users/eduardoreis/Library/Developer/Xcode/DerivedData/DemoOpenCV2-cqudsdzwopsadacnkbwrsxuncofg/Build/Products/Debug/DemoOpenCV2

Undefined symbols for architecture x86_64:
"cv::namedWindow(std::__1::basic_string, std::__1::allocator > const&, int)", referenced from: _main in main.o "cv::imread(std::__1::basic_string, std::__1::allocator > const&, int)", referenced from: _main in main.o "cv::imshow(std::__1::basic_string, std::__1::allocator > const&, cv::_InputArray const&)", 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)

Then (thanks God and some days of googling) I got this:

Select your project, go to the Build Settings tab, filter by c++ standard library, and set this parameter to libstdc++ (GNU C++ standard library).

from: Undefined symbols for architecture x86_64 error when linking OpenCV in Xcode

And finally it was sunny again in my code environment...

Upvotes: 1

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