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Thread: Help with undefined reference in Windows with mingw32

  1. #1
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    Default Help with undefined reference in Windows with mingw32

    Hi,

    I'm getting undefined reference when I build an application in Windows witn mingw32 (it does not happen in Linux). The application is divided in two parts:

    1. A set of designer plugins with the PRO like:
    Qt Code:
    1. QT += core gui sql
    2. CONFIG += designer plugin debug_and_release
    3. TARGET = $$qtLibraryTarget(impwidgetsplugin)
    4. TEMPLATE = lib
    5. ....
    To copy to clipboard, switch view to plain text mode 

    This generate the files: libimpwidgetsplugin.a and impwidgetsplugin.dll in c:\ilri\crossimpact\

    2. A set of plugins in a library that requires impwidgetsplugin with the PRO like:
    Qt Code:
    1. QT += core gui sql svg
    2.  
    3. TARGET = $$qtLibraryTarget(impmainmodules)
    4. TEMPLATE = lib
    5. CONFIG += plugin
    6.  
    7. win32:LIBS += c:\ilri\crossimpact\libimpwidgetsplugin.a
    8. ....
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    The problem is that I always get:
    Qt Code:
    1. ./debug\plots.o:C:\ilri\crossimpact\plugins\syschar\impmainmodules/modules/plots.cpp:203: undefined reference to `impgenmaint::insertKeyField(QString, QVariant, bool)'
    To copy to clipboard, switch view to plain text mode 
    Here, impgenmaint::insertKeyField(QString, QVariant, bool) is defined in the designer plugin impwidgetsplugin.dll

    I can see that mingw32 is apparently using the library:
    Qt Code:
    1. mingw32-make[1]: Entering directory `C:/ilri/crossimpact/plugins/syschar/impmainmodules'
    2. g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -mthreads -Wl -shared -Wl,--out-implib,..\..\..\libimpmainmodules.a -o ..\..\..\impmainmodules.dll object_script.impmainmodules.Debug -L"c:\Qt\2010.03\qt\lib" c:\ilri\crossimpact\libimpwidgetsplugin.a -lQtSvgd4 -lQtSqld4 -lQtGuid4 -lQtCored4
    To copy to clipboard, switch view to plain text mode 

    Any idea how I need to configure the PRO so it properly links it?

    Many thanks for any help.
    Carlos.

  2. #2
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    Default Re: Help with undefined reference in Windows with mingw32

    Try
    Qt Code:
    1. win32:LIBS += -Lc:/ilri/crossimpact -limpwidgetsplugin
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  3. #3
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    Default Re: Help with undefined reference in Windows with mingw32

    Hi,

    Thanks for your reply.

    I tried that and still does not work.

    I also try to build both libraries on release but I get the same result

    This is the first error:
    Qt Code:
    1. ./release\plots.o:plots.cpp:(.text+0x13f5): undefined reference to `calcDialog::calcDialog(QWidget*)'
    To copy to clipboard, switch view to plain text mode 

    Indeed the code in plots.cpp uses calcDialog like:
    Qt Code:
    1. #include <calcdialog.h>
    2. ....
    3. calcDialog calc;
    4. calc.setDatabase(dataBase);
    5. calc.setCurrentDisplay(index.data().toFloat());
    6. calc.exec();
    7. ....
    To copy to clipboard, switch view to plain text mode 

    In the PRO I have the include path of calculator:
    Qt Code:
    1. INCLUDEPATH += ../../../plugins/interfaces ../../designer/impwidgets ../../designer/impwidgets/widgets/calculator
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    So, I really don't know what is wrong because in Linux it works ok with:
    Qt Code:
    1. unix:LIBS += -L/home/cquiros/data/projects/tools/crossimpact -limpwidgetsplugin
    To copy to clipboard, switch view to plain text mode 
    Many thanks,
    Carlos.
    Last edited by qlands; 22nd March 2012 at 07:06.

  4. #4
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    Default Re: Help with undefined reference in Windows with mingw32

    Post content of both pro files, maybe there's a problem you're missing.

  5. The following user says thank you to Spitfire for this useful post:

    qlands (23rd March 2012)

  6. #5
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    Default Re: Help with undefined reference in Windows with mingw32

    I fixed!

    I had to put Q_DECL_EXPORT and Q_DECL_IMPORT in the library + DEFINES in the pro.

    http://qt-project.org/doc/qt-4.8/sharedlibrary.html

    Thanks.

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