opencv on ubuntu - cannot find lib files - eclipse

I am following this guide:
to get opencv to run on ubuntu 12.04 with eclipse juno CDT. But I get this error when I build all:
Building target: DisplayImage
Invoking: GCC C++ Linker
g++ -L/usr/local/lib -o "DisplayImage" ./src/DisplayImage.o -lopencv_core\ opencv_imgproc\ opencv_highgui
/usr/bin/ld: cannot find -lopencv_core opencv_imgproc opencv_highgui
collect2: ld returned 1 exit status
make: *** [DisplayImage] Error 1
In eclipse I have added:
opencv_core opencv_imgproc opencv_highgui
in the "Libraries (-l)" box. If I run (as described in the guide):
pkg-config --libs opencv
I get:
/usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so /usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so /usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so /usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so /usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so /usr/local/lib/libopencv_nonfree.so /usr/local/lib/libopencv_objdetect.so /usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so /usr/local/lib/libopencv_ts.so /usr/local/lib/libopencv_video.so /usr/local/lib/libopencv_videostab.so
so they seem to exists. But the names are a bit different compared to the guide. I have tried to change the includes in eclipse to:
libopencv_core.so libopencv_imgproc.so opencv_highgui
but that does not help. Any ideas?
EDIT:
This is how I setup the includes:
And this is how I setup the libs(linker):


Ah each lib must be on a separate line in the C++linker->Libraries box.


It seems that you forget to set Library search path(-L) to usr/local/lib/ in C++ Linker->Libraries:
Update: from your screenshot I see that all your libs are in one line. Take a look again at my screenshot.

Related

How do I develop bare-metal i.mx6sx code using eclipse?

I was wondering if you could help me with some issues and questions I have for developing for the i.MX6 SoloX in bare-metal. I was looking at this link https://community.nxp.com/docs/DOC-106253 and downloaded the files there to use as an example of how to develop bare-metal c code for the i.MX6.
Then I setup my eclipse environment according to this tutorial https://community.nxp.com/docs/DOC-103736 but just the toolchain because I'm not interested in processor expert.
Since I'm working on Linux I didn't installed the Code Sourcery thing, instead I'm working with the gcc-arm-none-eabi which I installed using:
$ sudo apt-get install gcc-arm-none-eabi
And therefore I had to change the cs-rm and cs-make for rm and make respectively.
And I was able to create an eclipse project with the downloaded code and configure the project to make it work, nevertheless, I had the first error:
main.c:8:19: fatal error: stdio.h: No such file or directory
#include <stdio.h>
^
compilation terminated.
make: *** [cortex_A9/main.o] Error 1
cortex_A9/subdir.mk:24: recipe for target 'cortex_A9/main.o' failed
And I was able to solve it adding "/usr/include" in the include directories at project > properties. But I'm not sure if this is a correct way of solving this error.
After fixing this error I got a new one:
syscalls.c:168:1: error: unknown type name 'caddr_t'
caddr_t _sbrk(int incr)
And for solving that I had to include explicitly the file "/usr/include/x86_64-linux-gnu/sys/types.h" and also I don't know if that is the correct way to solve it.
Now having eliminated those two errors I have the following one:
Building target: imx6-A9.elf
Invoking: Cross ARM C Linker
arm-none-eabi-gcc -mcpu=cortex-a9 -march=armv7-a -marm -mlittle-endian -mfloat-abi=softfp -mfpu=neon -mno-unaligned-access -fno-zero-initialized-in-bss -O0 -g -T "/home/mmalagon/iMX6/MX6SX_hello_MFG/cortex_A9/mx6slx.ld" -nostartfiles -Wl,-Map,"imx6-A9.map" -o "imx6-A9.elf" ./cortex_A9/main.o ./cortex_A9/syscalls.o ./cortex_A9/uart.o
/usr/lib/gcc/arm-none-eabi/4.9.3/../../../arm-none-eabi/bin/ld: cannot find -lg
makefile:42: recipe for target 'imx6-A9.elf' failed
/usr/lib/gcc/arm-none-eabi/4.9.3/../../../arm-none-eabi/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
make: *** [imx6-A9.elf] Error 1
Which I haven't been able to resolve.
I don't know if this error is a consequence of the way I solved the two previous errors.
Does anybody know how to properly setup eclipse for i.MX6 bare-metal development?
Thank you very much for helping!!

If you want to develop bare-metal code for the i.MX6SoloX without using CodeSourcery then you need to execute this:
sudo apt-get install gcc-arm-none-eabi libnewlib-arm-none-eabi -y
And then choose "Custom (arm-none-eabi-gcc)" at Project>Settings>C/C++ Build in the 'Toolchains' tab.

cross compiling opencv with eclipse in ubuntu

I am able to cross compile hello world program in raspberry pi from my Ubuntu 14.04 PC through eclipse. But I am not able to cross compile opencv programs. I am getting following error:
15:19:20 ** Incremental Build of configuration Debug for project MyFirstRaspProg **
make all
Building target: MyFirstRaspProg
Invoking: Cross G++ Linker
arm-linux-gnueabi-g++ -L/home/tvsm/raspberry -L/usr/lib/gcc-cross/arm-linux-gnueabi/4.7 -L/usr/lib/i386-linux-gnu/lib -L/usr/arm-linux-gnueabi/lib -o "MyFirstRaspProg" ./src/MyFirstRaspProg.o -lopencv_highgui
/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/../../../../arm-linux-gnueabi/bin/ld: cannot find -lopencv_highgui
collect2: error: ld returned 1 exit status
make: * [MyFirstRaspProg] Error 1
15:19:20 Build Finished (took 56ms)
Can anyone help how to resolve this?

The error is because you have specified arm-linux-gnueabi-g++ to refer a library, which is not available. So you need to cross compile the necessary library for ARM platform and link it during build.
Follow the below link to cross compile the opencv on Ubuntu machine.
http://www.ridgesolutions.ie/index.php/2013/05/24/building-cross-compiling-opencv-for-linux-arm/
You will be left with an "install" folder at the end of the process.
In eclipse specify the library path and include path to "lib" & "include" folders in the "install" folder respectively.

/usr/bin/ld cannot find lib files when compiling openCv matlab source

I am getting the following error when trying to compile openCV with the matlab module.
I just run $make in the realse folder that I created like in the tutorial from opencv.org
[ 98%] Compiling Matlab source files. This could take a while...
CMake Error at /home/alex/Downloads/opencv-master/modules/matlab/compile.cmake:47 (message):
Failed to compile drawChessboardCorners: /usr/bin/ld: cannot find
-lopencv_core
/usr/bin/ld: cannot find -lopencv_imgproc
(Removed alot of lines with lib files here)
collect2: error: ld returned 1 exit status
mex: link of ' "drawChessboardCorners.mexa64"' failed.
How do I fix the link error? Does it have something to do with matlab?
MATLAB 2013a
Ubuntu 13.10

I don't think this is related to MATLAB. The:
/usr/bin/ld: cannot find
points probably to a missing path for the opencv_core library that the linker cannot find during compilation. See: usr/bin/ld: cannot find -l<nameOfTheLibrary>
If you are building manually you could add an -L option, e.g.,
-L<path_to_opencv_core> before the -lopencv_core or -lopencv_imgproc
to the command line build command. If you are using a CMake file, there may be an ${OPENCV_LIB_INSTALL_PATH} (or something similar) that you can set, e.g., using ccmake.

Executing cuda program through Eclipse is giving error

I am using eclipse to execute a cuda program. I have downloaded a CUDA PLUGIN for
eclipse. When I execute sample cuda program given by plugin its fine but when I try
to execute any other program I am getting error undefined reference to main...
make
Building target: Add_cuda
Invoking: NVCC Linker
nvcc -L/export/trainee3/dinesh/cuda5.0/lib64 -o "Add_cuda" ./mycuda.o -lcudart
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
I found in stackoverflow that some times we get this problem because of system startup file
I used flag -nostartfiles but it is not working in my case..
I have included lib64 and include path in c++ build.
So any suggestion to over come this problem....

We've been over this already.
Use nsight eclipse edition instead.
If you have cuda 5.0 or 5.5 installed, just type nsight in a terminal session.
If you really want to use that Eclipse CUDA plugin (which is no longer supported, I don't believe), then start with the C++ sample project, which you agree now and back then would work. Then modify the source code in that project. Don't create your own project.

Install CUDA 5. It comes with Nsight Eclipse version. Very Elegant to use. NV Visual profiler is integrated with Nsight. Syntax highlighting and debug mode are very easy to use.

gcc linker can't find library (openNI)

Can anybody give me some hints for solving this?
I'm trying to compile "Kinect Matlab" (on Mac OS 10.7), in the compile script is the following line:
mex('-v','-L/usr/lib/','-lOpenNI',[...],Filename);
This is the full command run by mex: (1)
gcc-4.2 -O -Wl,-twolevel_namespace -undefined error -arch x86_64 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5 -bundle -Wl,-exported_symbols_list,/Applications/MATLAB_R2011a.app/extern/lib/maci64/mexFunction.map -o "mxNiChangeDepthViewPoint.mexmaci64" mxNiChangeDepthViewPoint.o -L/usr/lib/ -lOpenNI -L/Applications/MATLAB_R2011a.app/bin/maci64 -lmx -lmex -lmat -lstdc++
Then I'm getting the following error:
ld: library not found for -lOpenNI
collect2: ld returned 1 exit status
mex: link of ' "mxNiChangeDepthViewPoint.mexmaci64"' failed.
There is most definitely a file at /usr/lib/libOpenNI.dylib.
What kinds of things cause ld to throw this error?
What I tried:
I have tried creating a symlink called libOpenNI.so, like jmlopez suggested, no effect.
Could it be that libOpenNI is a 32bit library, and ld is not seeing it for that reason? Or would the error then be different?
Regarding the point above, it says that the build is "universal x86/x64"
Env vars:
I've tried to add the library to the environment variables using the following command, from the matlab terminal. No effect.
setenv('DYLD_LIBRARY_PATH', [getenv('DYLD_LIBRARY_PATH') ':/usr/lib/']);
In bash:
Just calling gcc as suggested here https://serverfault.com/questions/54736/how-to-check-if-a-library-is-installed gives no problems.
$ gcc -lOpenNi
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
However, if I run g++ first, then gcc as in (1), same error as before. (library not found). How come gcc can find the library, but when matlab adds the stuff in (1) it messes things up?
So, related to what is said above, I started removing all arguments from (1) until I got a different error. I removed the -Wl,-syslibroot, meaning that -syslibroot would no longer be passed to ld, this seems to have fixed it. So -syslibroot is messing up the library search directory! Now to find a way to remove this argument from the mex() call.

Did you trying adding OpenNi to your LIBRARY_PATH ?
export LIBRARY_PATH=$LIBRARY_PATH:/YOUR-PATH/OpenNi

First option: if libOpenNi isn't of the same architecture as the binary you're compiling, the whole compiler suite will likely ignore it. If you did manage to get it to link anyway, it would probably crash. Find a native 64 bit library and link against that.
Second option: I'm not 100% sure on this, but whenever I've tried doing linking on some esoteric linux projects, I start with a .a object archive in the path specified by -L. If it links, then I'll add -fPIC -shared on x86_64 to get it to compile against the shared library. I'm not sure if this will work on OSX: I've never done development on that platform yet.

BOOM! IT WORKS!
Okay, here it is:
The -Wl,-syslibroot option in the gcc call (1) is sending a -syslibroot option to the linker, and somehow that gets prepended to the library search path (even though it shouldn't according to cannot specify root sdk directory with syslibroot when linking)
So, removing this -syslibroot can solve our problem, this can be done in mexopts.sh. Copying matlab's version from the default location:
cp /Applications/MATLAB_R2011a.app/bin/mexopts.sh ~/.matlab/R2011a/
And then changing this line (201):
LDFLAGS="-Wl,-twolevel_namespace -undefined error -arch $ARCHS -Wl,-syslibroot,$SDKROOT -mmacosx-version-min=$MACOSX_DEPLOYMENT_TARGET"
Removing the -Wl,-syslibroot,$SDKROOT argument.
Additionally, I could remove the -L/usr/lib argument from the call to mex, making it simply:
mex('-v','-lOpenNI',['-I' OpenNiPathInclude],Filename);