| Summary: | --libs-only-l does not contain anything even though --libs does | ||
|---|---|---|---|
| Product: | pkg-config | Reporter: | andrea.tagliasacchi |
| Component: | src | Assignee: | Dan Nicholson <dbn.lists> |
| Status: | RESOLVED NOTOURBUG | QA Contact: | |
| Severity: | critical | ||
| Priority: | medium | ||
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | Mac OS X (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
Sorry for the slow reply. Could you show the contents of opencv.pc? ~: cat /usr/local/lib/pkgconfig/opencv.pc
# Package Information for pkg-config
prefix=/usr/local/Cellar/opencv/2.4.9
exec_prefix=${prefix}
libdir=
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include
Name: OpenCV
Description: Open Source Computer Vision Library
Version: 2.4.9
Libs: ${exec_prefix}/lib/libopencv_calib3d.dylib ${exec_prefix}/lib/libopencv_contrib.dylib ${exec_prefix}/lib/libopencv_core.dylib ${exec_prefix}/lib/libopencv_features2d.dylib ${exec_prefix}/lib/libopencv_flann.dylib ${exec_prefix}/lib/libopencv_gpu.dylib ${exec_prefix}/lib/libopencv_highgui.dylib ${exec_prefix}/lib/libopencv_imgproc.dylib ${exec_prefix}/lib/libopencv_legacy.dylib ${exec_prefix}/lib/libopencv_ml.dylib ${exec_prefix}/lib/libopencv_nonfree.dylib ${exec_prefix}/lib/libopencv_objdetect.dylib ${exec_prefix}/lib/libopencv_ocl.dylib ${exec_prefix}/lib/libopencv_photo.dylib ${exec_prefix}/lib/libopencv_stitching.dylib ${exec_prefix}/lib/libopencv_superres.dylib ${exec_prefix}/lib/libopencv_ts.a ${exec_prefix}/lib/libopencv_video.dylib ${exec_prefix}/lib/libopencv_videostab.dylib
Cflags: -I${includedir_old} -I${includedir_new}
~:
Oh, that's a tricky one. You're not actually specifying -l anywhere, so pkg-config thinks it's doing the right thing. It might be possible to fix this, but the best thing to do would be to fix the opencv pkg-config file to act like a standard pc file.
prefix=/usr/local/Cellar/opencv/2.4.9
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include
Name: OpenCV
Description: Open Source Computer Vision Library
Version: 2.4.9
Libs: -L${exec_prefix}/lib -lopencv_calib3d -lopencv_contrib -lopencv_core ...
Cflags: -I${includedir_old} -I${includedir_new}
Actually, now that I think about this some more, I think the bug is in cmake's FindPkgConfig. They're assuming that the only way to specify libraries is through -l. That's a reasonable assumption, but not technically correct. It's entirely reasonable to specify an absolute path to a library. I think this would be fixed if the LIBRARIES call was made as --libs-only-l --libs-only-other. The other flags will contain all of your direct opencv*.dylib libraries. That might introduce other issues in cmake's pkg-config handling, but I don't believe this is pkg-config's bug. This is either cmake's bug (assuming -l contains all the libraries) or opencv's bug (shipping a non-standard pkg-config file). |
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In cmake I can use PkgConfig to import opencv: #--- OpenCV (with pkgconfig) find_package(PkgConfig REQUIRED) pkg_check_modules(OPENCV REQUIRED opencv) list(APPEND LIBRARIES ${OPENCV_LIBRARIES}) message(STATUS LIBS ${OPENCV_VERSION}) include_directories(${OPENCV_INCLUDE_DIRS}) However, I noticed OPENCV_LIBRARIES was empty!! I checked FindPkgConfig.cmake and noticed the following: pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARIES "(^| )-l" --libs-only-l ) pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS "" --libs ) So I went and tried... ~/Developer/homebrew: pkg-config --libs opencv /usr/local/Cellar/opencv/2.4.9/lib/libopencv_calib3d.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_contrib.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_core.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_features2d.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_flann.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_gpu.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_highgui.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_imgproc.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_legacy.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_ml.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_nonfree.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_objdetect.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_ocl.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_photo.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_stitching.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_superres.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_ts.a /usr/local/Cellar/opencv/2.4.9/lib/libopencv_video.dylib /usr/local/Cellar/opencv/2.4.9/lib/libopencv_videostab.dylib ~/Developer/homebrew: pkg-config --libs-only-l opencv ~/Developer/homebrew: As you can see --libs-only-l is completely empty! If this is a problem with opencv.pc please let me know.