[Solved] Cannot link libs statically

SGaist

Looks fine

Can you show the exact compilation errors you have ?

On a side note, you can use the unix notation in the pro files even on Windows

liimyd

There's 17 errors, one for each of the OpenCV libaries that I try to link. They're all the same except for the name of the lib. Here's just the first one:

C:/Qt/Tools/mingw491_32/bin/../lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lopencv_calib3d300

SGaist

Did you check the compiler output panel to see what you have as -L parameters ?

liimyd

Sorry for the slow reply! It was a busy week for school.

This is what my compiler output says right before I get the errors, I'm not too sure what you mean by the -L parameters, is this it?

g++ -static -static-libgcc -Wl,-s -Wl,-subsystem,windows -mthreads -o release\blood_visual.exe release/main.o release/mainwindow.o release/contours.o release/edge.o release/blood_visual_plugin_import.o release/moc_mainwindow.o release/moc_contours.o release/moc_edge.o -lmingw32 -LC:/Qt/Static/5.3/lib -lqtmain -LC:\Programs\opencvMinGW\install\x64\mingw\bin -lopencv_calib3d300 -lopencv_core300 -lopencv_features2d300 -lopencv_flann300 -lopencv_highgui300 -lopencv_imgcodecs300 -lopencv_imgproc300 -lopencv_ml300 -lopencv_objdetect300 -lopencv_photo300 -lopencv_shape300 -lopencv_stitching300 -lopencv_superres300 -lopencv_video300 -lopencv_videoio300 -lopencv_videostab300 -LC:/Qt/Static/5.3/plugins/accessible -lqtaccessiblewidgets -lQt5Widgets -LC:/Qt/Static/5.3/plugins/platforms -lqwindows -lwinspool -lshlwapi -lQt5PlatformSupport -LC:/Qt/Static/5.3/plugins/imageformats -lqdds -lqicns -lqico -lqjp2 -lqmng -lqtga -lqtiff -lqwbmp -lqwebp -lQt5Gui -lcomdlg32 -loleaut32 -limm32 -lwinmm -lglu32 -lopengl32 -lgdi32 -lQt5Core -lole32 -luuid -lws2_32 -ladvapi32 -lshell32 -luser32 -lkernel32

SGaist

-L is used to give the linker additional folders to search for libraries. It seems that you didn't add the folder where the OpenCV libraries are located.

liimyd

I'm slightly confused. From one of my previous posts above, didn't I correctly link the OpenCV folder containing the libraries in my .pro file? Or was I supposed to do it another way?

SGaist

Where is opencv_calib3d300.lib located on your computer ?

liimyd

They're all in C:\Programs\opencvMinGW\install\x64\mingw\bin, which was made with CMake.

Perhaps I'm using the wrong types of libraries? All of the openCV files in that folder have a format like "libopencv_calib3d300.dll", for instance. Maybe I'm not supposed to be using .dll files? It works fine with my other kit though.

SGaist

You don't link to dlls you link to lib files, where are these located ?

liimyd

Ahhhhhhhh I see... :(
Yes, those should be in C:\Programs\opencv\build\x86\vc12\staticlib

Now I know why the folder was called "staticlib"... I will try this later! Thank you!!

SGaist

Not so fast ! Since you have dlls you probably have a second set of these in another folder. On Windows, the static libraries and the import libraries have the same extension...

liimyd

I can't find another folder containing the libs (neither in the original opencv folders, nor in the folders created by CMake), and as you predicted, the libraries in staticlib didn't work. Where can I go from here?

SGaist

I just realized: C:\Programs\opencv\build\x86\vc12\staticlib
That means that these libs are for Visual Studio not MinGW

Unless you built OpenCV yourself, just grab the archive again

liimyd

Sorry, I don't quite understand. After I re-downloaded the package for opencv 3.0, I only had files with a .lib extension in the staticlib folder, which you already said not to use, and in C:\Programs\opencv\build\x86\vc12\lib, which only has opencv_ts300 and opencv_world300 (I don't know how to use these). I can't seem to find any other .lib files.

SGaist

Then where did you get the dlls from ?

liimyd

The dlls were created with cmake, but I couldn't find the regular libraries from the cmake-generated folders. Do I have to rebuild opencv with cmake? I was using the cmake-gui and there were a lot of different options that I could check or uncheck. Maybe some of them will build the regular libraries?

SGaist

If the dlls were created with cmake then you already built it by hand so you should have the corresponding lib files somewhere

liimyd

I rebuilt opencv, this time with BUILD_SHARED_LIBS = Off, which made .a files.
I read that .a files are the same as .lib files.
My .pro file now looks like this:

INCLUDEPATH += C:\\Programs\\opencvMinGW5\\install\\include

LIBS += -LC:\\Programs\\opencvMinGW5\\install\\x64\\mingw\\staticlib \
-lopencv_core300 \
-lopencv_highgui300 \
-lopencv_imgcodecs300 \
-lopencv_imgproc300 \
-lzlib \
-lIlmImf

I have a few compilation errors, and I wasn't able to google them, do you know what they mean?

g++ -static -static-libgcc -Wl,-s -Wl,-subsystem,windows -mthreads -o release\blood_visual.exe release/main.o release/mainwindow.o release/contours.o release/edge.o release/blood_visual_plugin_import.o release/moc_mainwindow.o release/moc_contours.o release/moc_edge.o -lmingw32 -LC:/Qt/Static/5.3/lib -lqtmain -LC:\Programs\opencvMinGW5\install\x64\mingw\staticlib -lopencv_core300 -lopencv_highgui300 -lopencv_imgcodecs300 -lopencv_imgproc300 -lzlib -lIlmImf -LC:/Qt/Static/5.3/plugins/accessible -lqtaccessiblewidgets -lQt5Widgets -LC:/Qt/Static/5.3/plugins/platforms -lqwindows -lwinspool -lshlwapi -lQt5PlatformSupport -LC:/Qt/Static/5.3/plugins/imageformats -lqdds -lqicns -lqico -lqjp2 -lqmng -lqtga -lqtiff -lqwbmp -lqwebp -lQt5Gui -lcomdlg32 -loleaut32 -limm32 -lwinmm -lglu32 -lopengl32 -lgdi32 -lQt5Core -lole32 -luuid -lws2_32 -ladvapi32 -lshell32 -luser32 -lkernel32

C:\Programs\opencvMinGW5\install\x64\mingw\staticlib\libopencv_highgui300.a(window_w32.cpp.obj):window_w32.cpp:(.text$ZL17icvCreateTrackbarPKcS0_PiiPFviEPFviPvES4+0x62f): undefined reference to `_imp__CreateToolbarEx@52'

C:\Programs\opencvMinGW5\install\x64\mingw\staticlib\libopencv_imgproc300.a(imgwarp.cpp.obj):imgwarp.cpp:(.text$cvLogPolar+0x68b): undefined reference to `cvCartToPolar'

C:\Programs\opencvMinGW5\install\x64\mingw\staticlib\libopencv_imgproc300.a(imgwarp.cpp.obj):imgwarp.cpp:(.text$cvLogPolar+0x6c9): undefined reference to `cvLog'

C:/Qt/Tools/mingw491_32/bin/../lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/bin/ld.exe: C:\Programs\opencvMinGW5\install\x64\mingw\staticlib\libopencv_imgproc300.a(imgwarp.cpp.obj): bad reloc address 0x6c9 in section `.text$cvLogPolar'

I think I might be missing some static libs or maybe the order I'm listing the libs is wrong.

SGaist

There's something not clear, I see MinGW5 in your OpenCV path and Qt uses 4.9.1, which one did you use to build OpenCV ?

liimyd

OpenCVMinGW5 is just the name of the folder for my Cmake files (my sad 5th attempt at building OpenCV). I used 4.9.1 to build. Sorry for the confusion.