Compiling mergevec.cpp failing on OSX 10.9

[mrnugget]

Compiling mergevec.cpp failing on OSX 10.9

[mrnugget]

Hey there. Which version of OpenCV did you use? Which version of the source code? I'll try to reproduce this issue. My guess at the moment is that something in the recipes of OpenCV and/or libtbb changed.

[moezzie]

Good thought, yes, you might be right. When installing OpenCV from homebrew it downloaded the lastest version 2.4.9 together with tbb42_20140122.
When downloading the source i got v2.4.5 as you specified. Also tried v2.4.9 just to be sure.

[mrnugget]

It seems like the pkg-config metadata files for OpenCV contain the wrong linker information about tbb. The tbb lib files are here (at least on my system):

/usr/local/Cellar/tbb/4.2.3/lib/libtbb.dylib
/usr/local/lib/libtbb.dylib

The second one is a symlink to the first file. Now, /usr/local/lib should be one of the standard paths the linker looks for libraries, which means it should find it. But the problem is that -llibtbb.dylib is passed to the linker. The convention is to drop the lib when passing stuff to the linker.

If we open /usr/local/lib/pkgconfig/opencv.pc (which provides the meta-information for pkg-config) and change -llibtbb.dylib to -ltbb our g++ command line works flawlessly.

[mrnugget]

Seems like the problem is with the OpenCV build system, which generates the opencv.pc file and includes the wrong linking information:

# Package Information for pkg-config

prefix=/usr/local
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 ${exec_prefix}/lib/libopencv_videostab.dylib -llibtbb.dylib
Cflags: -I${includedir_old} -I${includedir_new}

Now, this is hacky, but it should fix the problems for this tutorial here:

g++ `pkg-config --libs --cflags opencv | sed 's/libtbb\.dylib/tbb/'` -I. -o mergevec mergevec.cpp\
  cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp\
  cvhaartraining.cpp\
  -lopencv_core -lopencv_calib3d -lopencv_imgproc -lopencv_highgui -lopencv_objdetect

Can you give me feedback if that works for you?

[mrnugget]

I also opened an issue on the OpenCV bug tracker: http://code.opencv.org/issues/3691
Let's see what they have to say. Maybe it's not a problem with OpenCV but with Homebrew.

[moezzie]

Yes, the updated commands work right out of the box together with the source for v2.4.5 and v2.4.9.
Seems like the following thread on StackOverflow is referencing the same error:
http://stackoverflow.com/questions/23363678/ld-library-not-found-for-llibtbb-dylib

Seems like you are right :)

[mrnugget]

Cool. Then I'll update the readme to use 2.4.9 and the new command.

On Wednesday, May 14, 2014, moezzie [email protected] wrote:

Yes, the updated commands work right out of the box together with the
source for v2.4.5 and v2.4.9.
Seems like the following thread on StackOverflow is referencing the same
error:

http://stackoverflow.com/questions/23363678/ld-library-not-found-for-llibtbb-dylib

Seems like you are right :)

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/2#issuecomment-43056036
.

[JamEngulfer]

I've come across this error now, and I'm getting the same problem. However, I've tried everything you suggested, but it's still returning the same error or a similar one: I.E: "ld: library not found for -ltbb" or "ld: library not found for -libtbb.dylib". I've checked through and the actual libraries exist and are symlinked, but it's not wanting to find them.

[mrnugget]

@JamEngulfer Is tbb installed on your system? What does brew info opencv and brew info tbb say?

(Sorry for the delay, I was on vacation)

[JamEngulfer]

I've checked the installations and both packages are installed. The versions are 'opencv-2.4.9' and 'tbb-4.3-20140724'. Under the info for openCV, it has tab ticked as an option.

[mrnugget]

Okay. What's the output of pkg-config --libs --cflags opencv?

[JamEngulfer]

The complete output is this:

-I/usr/local/Cellar/opencv/2.4.9/include/opencv -I/usr/local/Cellar/opencv/2.4.9/include /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

[mrnugget]

Did you install opencv with the --with-tbb Option?

[JamEngulfer]

Indeed I did

[mrnugget]

I actually don't have any more ideas as to how to fix your issue. But here is the output on my system with the relevant information:

$ brew info opencv
opencv: stable 2.4.9, HEAD
http://opencv.org/
/usr/local/Cellar/opencv/2.4.9 (219 files, 38M) *
  Built from source with: --with-tbb
From: https://github.com/homebrew/homebrew-science/blob/master/opencv.rb
==> Dependencies
Build: cmake ✔, pkg-config ✔
Required: jpeg ✔, libpng ✔, libtiff ✔
Recommended: openexr ✘
Optional: eigen ✔, gstreamer ✘, jasper ✔, libdc1394 ✘, openni ✘, qt ✔, tbb ✔, ffmpeg ✘
==> Options
--32-bit
        Build 32-bit only
--c++11
        Build using C++11 mode
--with-cuda
        Build with CUDA support
--with-eigen
        Build with eigen support
--with-ffmpeg
        Build with ffmpeg support
--with-gstreamer
        Build with gstreamer support
--with-jasper
        Build with jasper support
--with-java
        Build with Java support
--with-libdc1394
        Build with libdc1394 support
--with-openni
        Build with openni support
--with-qt
        Build the Qt4 backend to HighGUI
--with-quicktime
        Use QuickTime for Video I/O insted of QTKit
--with-tbb
        Enable parallel code in OpenCV using Intel TBB
--with-tests
        Build with accuracy & performance tests
--without-opencl
        Disable GPU code in OpenCV using OpenCL
--without-openexr
        Build without openexr support
--HEAD
        install HEAD version
==> Caveats
If you need Python to find the installed site-packages:
  mkdir -p ~/Library/Python/2.7/lib/python/site-packages
  echo '/usr/local/lib/python2.7/site-packages' > ~/Library/Python/2.7/lib/python/site-packages/homebrew.pth
$ pkg-config --libs --cflags opencv
-I/usr/local/Cellar/opencv/2.4.9/include/opencv -I/usr/local/Cellar/opencv/2.4.9/include /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 -llibtbb.dylib
$ brew info tbb
tbb: stable 4.3-20140724 (bottled)
http://www.threadingbuildingblocks.org/
/usr/local/Cellar/tbb/4.3-20140724 (104 files, 1.9M) *
  Poured from bottle
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/tbb.rb
==> Options
--c++11
        Build using C++11 mode

As you can see, the pkg-config output shows tbb, in the wrong format, but it's there.

[JamEngulfer]

Oh :/ Well, I'll do a complete clean reinstall and see if that fixes anything

[Glavin001]

This resolved the ld: library not found for -llibtbb.dylib issue for me: http://stackoverflow.com/a/23582975/2578205

Suppose libtbb.dylib is in /usr/local/lib/libtbb.dylib and opencv.pc is in /usr/local/lib/pkgconfig (The location may vary depending on where you install tbb and pkg-config)

Then edit /usr/local/lib/pkgconfig/opencv.pc, change -llibtbb.dylib to /usr/local/lib/libtbb.dylib

[jacksonkr]

@Glavin001 For whatever reason, your solution isn't working for me.

Compilation Error

[ 16%] Built target compressed_depth_image_transport_gencfg
[ 33%] Linking CXX shared library /Users/Jackson/ros_catkin_ws/devel_isolated/compressed_depth_image_transport/lib/libcompressed_depth_image_transport.dylib
ld: library not found for -ltbb
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [/Users/Jackson/ros_catkin_ws/devel_isolated/compressed_depth_image_transport/lib/libcompressed_depth_image_transport.dylib] Error 1
make[1]: *** [CMakeFiles/compressed_depth_image_transport.dir/all] Error 2
make: *** [all] Error 2

Modified /usr/local/lib/pkgconfig/opencv.pc

# Package Information for pkg-config

prefix=/usr/local/Cellar/opencv/2.4.12_2
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: 2.4.12
Libs: -L${exec_prefix}/lib -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_gpu -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_nonfree -lopencv_objdetect -lopencv_ocl -lopencv_photo -lopencv_stitching -lopencv_superres -lopencv_ts -lopencv_video -lopencv_videostab /usr/local/lib/libtbb.dylib
Cflags: -I${includedir_old} -I${includedir_new}

Am I missing something?