linker problem with opencv and devcpp

A little description about my environment: DevCpp 4.9.9.2 with OpenCV 2.3.1 on Windows Vista Home Premium SP1 32-bit

About my project - my project's .dev (FirstCVproj.dev) file is in c:...\Desktop\proj\openCV\ and the program i'm trying to compile "facedetect.cpp" is in c:\opencv\samples\c

The OpenCV compiler configuration in the tools->compilers in DevCpp is:

Compiler commands

-L"C:\opencv\build\x86\mingw\lib" -llibopencv_core231 -llibopencv_imgproc231 -llibopencv_calib3d231 -llibopencv_video231 -llibopencv_features2d231 -llibopencv_ml231 -llibopencv_highgui231 -llibopencv_objdetect231 -llibopencv_contrib231 -llibopencv_legacy231 -llibopencv_flann231
Linker commands

-llibopencv_core231 -llibopencv_imgproc231 -llibopencv_calib3d231 -llibopencv_video231 -llibopencv_features2d231 -llibopencv_ml231 -llibopencv_highgui231 -llibopencv_objdetect231 -llibopencv_contrib231 -llibopencv_legacy231 -llibopencv_flann231
Libraries directory: opencv\build\x86\mingw\lib

Binaries directory: opencv\build\x86\mingw\bin

Include directories: all the include folders in opencv folder (under the \build and the main folder)

So before I decided to post here, i was having the problems stated here and in that order:

libgcc_s_dw2_1.dll not found. Try reinstalling the application

Program can't find libgcc_s_dw2-1.dll

libstdc++-6.dll not found. Try reinstalling the application libstdc++-6.dll not found

Because using -static or -static-libgcc or -static-libstdc++ in linker command line options box did not work for me, i copied the first dll file to my project directory from some other directory in my system where i found it (and nowhere in mingw32 folder in C:\DevCpp) and downloaded the second one off the net, my project stopped giving run-time errors like "FirsCVProj has stopped working. Contact the application vendor for support" or ".dll was not found"

But it became worse, because at runtime, i did see the command output window of the program i was compiling in my project, but that just appeared for like a fraction of a second!

I rebuild the whole thing a couple of times, but then remembering Einstein's quote "Repeating the same thing and expecting a different output is insanity" i stopped.. That's where you guys come in. Here's the compilation log from which i can't help wondering why the files aren't linking.

Compiler: OpenCV
Building Makefile: "C:\Users\ronnieaka\Desktop\PROJ\openCV\Makefile.win"
Executing make clean
rm -f ../../../../../opencv/samples/c/facedetect.o FirstCVproj.exe
g++.exe -c ../../../../../opencv/samples/c/facedetect.cpp -o ../../../../../opencv/samples/c/facedetect.o -I"lib/gcc/mingw32/3.4.2/include" -I"include/c++/3.4.2/backward" -I"include/c++/3.4.2/mingw32" -I"include/c++/3.4.2" -I"include" -I"C:/opencv/include" -I"C:/opencv/include/opencv" -I"C:/opencv/include/opencv2" -I"C:/opencv/build/include" -I"C:/opencv/build/include/opencv" -I"C:/opencv/build/include/opencv2" -L"C:\opencv\build\x86\mingw\lib" -llibopencv_core231 -llibopencv_imgproc231 -llibopencv_calib3d231 -llibopencv_video231 -llibopencv_features2d231 -llibopencv_ml231 -llibopencv_highgui231 -llibopencv_objdetect231 -llibopencv_contrib231 -llibopencv_legacy231 -llibopencv_flann231
g++.exe: -llibopencv_core231: linker input file unused because linking not done
g++.exe: -llibopencv_imgproc231: linker input file unused because linking not done
g++.exe: -llibopencv_calib3d231: linker input file unused because linking not done
g++.exe: -llibopencv_video231: linker input file unused because linking not done
g++.exe: -llibopencv_features2d231: linker input file unused because linking not done
g++.exe: -llibopencv_ml231: linker input file unused because linking not done
g++.exe: -llibopencv_highgui231: linker input file unused because linking not done
g++.exe: -llibopencv_objdetect231: linker input file unused because linking not done
g++.exe: -llibopencv_contrib231: linker input file unused because linking not done
g++.exe: -llibopencv_legacy231: linker input file unused because linking not done
g++.exe: -llibopencv_flann231: linker input file unused because linking not done
g++.exe ../../../../../opencv/samples/c/facedetect.o -o "FirstCVproj.exe" -L"lib" -L"C:/opencv/build/x86/mingw/lib" -llibopencv_core231 -llibopencv_imgproc231 -llibopencv_calib3d231 -llibopencv_video231 -llibopencv_features2d231 -llibopencv_ml231 -llibopencv_highgui231 -llibopencv_objdetect231 -llibopencv_contrib231 -llibopencv_legacy231 -llibopencv_flann231
Execution terminated
Compilation successful


i also tried opencv\samples\c\mushroom.cpp and i got the output window in which the details of the program were printed, about its author etc, but then i got the windows message: "FirstCVproj has stopped working"

Quote:

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Originally Posted by ronnieaka

ibgcc_s_dw2_1.dll not found. Try reinstalling the application

Program can't find libgcc_s_dw2-1.dll

libstdc++-6.dll not found. Try reinstalling the application libstdc++-6.dll not found

---

Missing DLLs have nothing to do with "linker problem".
If you got these messages then your App had linked successfully.
But expected DLLs were not found in the path(s) they were supposed to be.
So, search for missing DLLs and try to put them in the correct folder...

The gcc flag -c means 'compile but do not link' so that's why the -l inputs not are used (and the informational text is emitted)

See for instance http://linux.die.net/man/1/gcc