On Fri, Feb 7, 2020 at 4:07 AM George N. White III <gnwiii(a)gmail.com> wrote:
On Thu, 6 Feb 2020 at 15:04, Danishka Navin
<danishka(a)gmail.com> wrote:
> Hi,
>
> I am new to eclipse and opencv and I was trying to build a sample c++
> code using Eclipse.
>
> I have installed following packages.
> rpm -qa | grep opencv
> opencv-devel-3.4.4-10.fc30.x86_64
> opencv-3.4.4-10.fc30.x86_64
> opencv-core-3.4.4-10.fc30.x86_64
> opencv-contrib-3.4.4-10.fc30.x86_64
>
>
> 00:29:09 **** Incremental Build of configuration Debug for project sample
> ****
> make all
> Building target: sample
> Invoking: GCC C++ Linker
> g++ -L/usr/lib64/ -L/usr/lib/ -o "sample" ./main.o
> -llibopencv_core.so.3.4 -llibopencv_core.so.3.4.4
> -llibopencv_highgui.so.3.4 -llibopencv_highgui.so.3.4.4
>
libopencv_core.so.3.4 should be a symbolic link to libopencv_core.so.3.4.4,
same for libopencv_highgui.so.3.4.
that's right
$ ls -l /usr/lib64/libopencv_core.so*
lrwxrwxrwx 1 root root 21 May 21 2019 /usr/lib64/libopencv_core.so ->
libopencv_core.so.3.4
lrwxrwxrwx 1 root root 23 May 21 2019
/usr/lib64/libopencv_core.so.3.4 -> libopencv_core.so.3.4.4
-rwxr-xr-x 1 root root 4898472 May 21 2019
/usr/lib64/libopencv_core.so.3.4.4
$ ls -l /usr/lib64/libopencv_highgui.so*
lrwxrwxrwx 1 root root 24 May 21 2019 /usr/lib64/libopencv_highgui.so
-> libopencv_highgui.so.3.4
lrwxrwxrwx 1 root root 26 May 21 2019
/usr/lib64/libopencv_highgui.so.3.4 -> libopencv_highgui.so.3.4.4
-rwxr-xr-x 1 root root 425512 May 21 2019
/usr/lib64/libopencv_highgui.so.3.4.4
Try:
g++ -o "sample" ./main.o -lopencv_core -lopencv_highgui
no errors
[danishka@2000 Debug]$ pwd
/home/danishka/workspace/sample/Debug
[danishka@2000 Debug]$ ls
main.d main.o makefile objects.mk sources.mk subdir.mk
[danishka@2000 Debug]$ g++ -o "sample" ./main.o -lopencv_core
-lopencv_highgui
[danishka@2000 Debug]$ ls
main.d main.o makefile objects.mk sample sources.mk subdir.mk
[danishka@2000 Debug]$ ls -l
total 124
-rw-rw-r-- 1 danishka danishka 20 Feb 7 00:26 main.d
-rw-rw-r-- 1 danishka danishka 54040 Feb 7 00:26 main.o
-rw-rw-r-- 1 danishka danishka 1318 Feb 7 00:29 makefile
-rw-rw-r-- 1 danishka danishka 337 Feb 7 00:29 objects.mk
-rwxrwxr-x 1 danishka danishka 48224 Feb 7 09:19 sample
-rw-rw-r-- 1 danishka danishka 526 Feb 7 00:29 sources.mk
-rw-rw-r-- 1 danishka danishka 708 Feb 7 00:29 subdir.mk
Stackoverflow
<
https://stackoverflow.com/questions/13904117/compiling-and-linking-opencv...
has
this among other solutions.
> /usr/bin/ld: cannot find -llibopencv_core.so.3.4
> /usr/bin/ld: cannot find -llibopencv_core.so.3.4.4
> /usr/bin/ld: cannot find -llibopencv_highgui.so.3.4
> /usr/bin/ld: cannot find -llibopencv_highgui.so.3.4.4
> collect2: error: ld returned 1 exit status
> make: *** [makefile:46: sample] Error 1
> "make all" terminated with exit code 2. Build might be incomplete.
>
> 00:29:10 Build Failed. 5 errors, 0 warnings. (took 419ms)
>
>
> $ locate opencv_core.so.3.4
> /usr/lib64/libopencv_core.so.3.4
> /usr/lib64/libopencv_core.so.3.4.4
>
> I have already added /usr/lib64/ and /usr/lib/ as library search paths in
> eclipse.
>
> Is there anything missing in my config?
>
> Regards,
> --
> Danishka Navin
>
>
--
George N. White III
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--
Danishka Navin