On Fri, Feb 7, 2020 at 4:07 AM George N. White III gnwiii@gmail.com wrote:
On Thu, 6 Feb 2020 at 15:04, Danishka Navin danishka@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-in-ubuntu-12-04 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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