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Error when linking exiv2 with Qt project (Windows)



  • I get the following error when I link to exiv2 in my Qt project (also in debug mode):

        release/MainWindow.o:MainWindow.cpp:(.text+0x29c): undefined reference to `__imp__ZN5Exiv212ImageFactory4openERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEb'
    
        collect2.exe: error: ld returned 1 exit status
        mingw32-make[1]: *** [Makefile.Release:85: release/RawImageDisplayer.exe] Error 1
    
    QT += core gui widgets multimedia sql
    TARGET = RawImageDisplayer
    TEMPLATE = app
    #CONFIG += c++11
    
    SOURCES += main.cpp \
                MainWindow.cpp \
                EmbeddedImage.cpp \
                exif.cpp \
                imagepreview.cpp
    
    
    HEADERS += MainWindow.h \
                EmbeddedImage.h \
                exif.h \
                imagepreview.h
    LIBS += $$quote(D:/_Projekte/ProductionLibraries/exiv2-0.27.2-MinGW64/lib/libexiv2.dll.a)
    LIBS += $$quote(D:/_Projekte/ProductionLibraries/exiv2-0.27.2-MinGW64/lib/libexiv2-xmp.a)
    #LIBS += -L/usr/local/lib -lexiv2
    #INCLUDEPATH += /usr/local/include
    INCLUDEPATH += $$quote(D:/_Projekte/ProductionLibraries/exiv2-0.27.2-MinGW64/include)
    

    I use mingw 64 bit and I got the same prebuilt binaries from the exiv2 website. Also I added the bin path to the system env variable PATH but at any time I get this error.

    Any thoughts? Many thanks.


  • Lifetime Qt Champion

    Which compiler did you use to compile the exiv lib and which do you use now? Why did you remove 'CONFIG += c++11' ? The std::string ABI changed between c++0x and c++11 so you have to make sure both libs are compiled with the same (either both c++11 or none)



  • @Christian-Ehrlicher

    I use the prebuilt MinGW64 binaries from the exiv2 site. I removed c++11 because I saw that exiv2 was built using c++98.

    What I‘ve also seen is that the dll file inside the bin directory is called msys-exiv2...


  • Lifetime Qt Champion

    I don't think removing c++11 will work since the compiler automatically is using c++11 (I would guess, gcc defaults to c++11 for a long time already).
    Compile the exiv lib with a recent compiler, you won't be able to use Qt5.12 (or even 5.9) with something older than c++11.



  • @Christian-Ehrlicher But why is it then working on macOS and on Linux just like out of the box? I think I did something wrong when linking to it but I cannot really find the mistake I made...


  • Lifetime Qt Champion

    @dublin19 said in Error when linking exiv2 with Qt project (Windows):

    But why is it then working on macOS and on Linux just like out of the box?

    Because there exiv2 seems to be compiled with a recent compiler. Compile exiv on your own with the same compiler as you use for Qt.


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