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Thread: Function previously defined in created file?

  1. #1
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    Default Function previously defined in created file?

    When I do qmake -project;qmake;make on a project containing files with the Q_OBJECT macro, I get something like this:
    moc_qtrackingbutton.cpp:80: error: redefinition of ‘void QTrackingButton::mouseMoved()’
    qtrackingbutton.h:23: error: ‘void QTrackingButton::mouseMoved()’ previously defined here
    make: *** [moc_qtrackingbutton.o] Error 1
    I've searched the internet a bit, and apparently putting the member functions in a different file to the class definition works. I did this, but it gave me "undefined reference to `vtable for classname'", until I moved these files out of the directory, then did qmake -project;qmake, then moved them back in for the final make. This is neither elegant nor convenient. Is there any way around, other than that?

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    Default Re: Function previously defined in created file?

    First of all qmake -project should only be done once when you start working on a project. It creates a template for the project file, which then should be updated manualy. The error you experience is probably because you run qmake -project on a directory which already contains files generated by moc and these file are added to the SOURCES group but they shouldn't. So either make distclean before running qmake -project again or modify the project file yourself (which is the way to go).

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    Default Re: Function previously defined in created file?

    Behold: no moc-generated files of any kind.
    ($:app4lin) ls -a
    ./ ../ app4lin.cxx qdoublebutton.h qtrackingbutton.h
    Now, after qmake -project:
    ($:app4lin) ls -a
    ./ ../ app4lin.cxx app4lin.pro qdoublebutton.h qtrackingbutton.h
    All as expected. qmake and:
    ($:app4lin) ls -a
    ./ ../ app4lin.cxx app4lin.pro Makefile qdoublebutton.h qtrackingbutton.h
    Again, all good. Then a make:
    ($:app4lin) make
    g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o app4lin.o app4lin.cxx
    ./qtrackingbutton.h:18: warning: unused parameter ‘e’
    /usr/lib/qt-3.3/bin/moc qdoublebutton.h -o moc_qdoublebutton.cpp
    g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o moc_qdoublebutton.o moc_qdoublebutton.cpp
    qtrackingbutton.h:18: warning: unused parameter ‘e’
    /usr/lib/qt-3.3/bin/moc qtrackingbutton.h -o moc_qtrackingbutton.cpp
    g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o moc_qtrackingbutton.o moc_qtrackingbutton.cpp
    qtrackingbutton.h:18: warning: unused parameter ‘e’
    moc_qtrackingbutton.cpp:80: error: redefinition of ‘void QTrackingButton::mouseMoved()’
    qtrackingbutton.h:23: error: ‘void QTrackingButton::mouseMoved()’ previously defined here
    make: *** [moc_qtrackingbutton.o] Error 1
    My .pro file:
    ################################################## ####################
    # Automatically generated by qmake (1.07a) Sat Jan 14 11:45:09 2006
    ################################################## ####################

    TEMPLATE = app
    INCLUDEPATH += .

    # Input
    HEADERS += qdoublebutton.h qtrackingbutton.h
    SOURCES += app4lin.cxx
    Nothing in SOURCES that shouldn't be.
    Last edited by Twey; 14th January 2006 at 12:53.

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    Default Re: Function previously defined in created file?

    Quote Originally Posted by Twey
    ...apparently putting the member functions in a different file to the class definition works. I did this, but it gave me "undefined reference to `vtable for classname'", until I moved these files out of the directory, then did qmake -project;qmake, then moved them back in for the final make. This is neither elegant nor convenient. Is there any way around, other than that?
    Could you please be a little more descriptive. It should be easy to deal with this kind of error, but I really haven't totally undertood the problem.

    Edit: As I can guess from the .pro file, you have implementation and declaration in the header file?
    Edit2:Sorry I apparently pressed the forward button insted of edit while reading my previous post and I can't seem to find a way to delete the duplicate
    Last edited by yop; 14th January 2006 at 13:10.

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    Default Re: Function previously defined in created file?

    As I can guess from the .pro file, you have implementation and declaration in the header file?
    Yes. Is this not correct? Here, I have cleaned all make- and qmake-generated files, moved my implementation to seperate .cxx files, and tried to build again.
    Qt Code:
    1. ($:app4lin) make
    2. g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o app4lin.o app4lin.cxx
    3. ./qtrackingbutton.cxx:20: warning: unused parameter ‘e’
    4. g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o qdoublebutton.o qdoublebutton.cxx
    5. qtrackingbutton.cxx:20: warning: unused parameter ‘e’
    6. g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o qtrackingbutton.o qtrackingbutton.cxx
    7. qtrackingbutton.cxx:20: warning: unused parameter ‘e’
    8. /usr/lib/qt-3.3/bin/moc qdoublebutton.h -o moc_qdoublebutton.cpp
    9. g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o moc_qdoublebutton.o moc_qdoublebutton.cpp
    10. qtrackingbutton.cxx:20: warning: unused parameter ‘e’
    11. /usr/lib/qt-3.3/bin/moc qtrackingbutton.h -o moc_qtrackingbutton.cpp
    12. g++ -c -pipe -Wall -W -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m32 -march=i386 -mtune=pentium4 -fasynchronous-unwind-tables -DQT_NO_DEBUG -I/usr/lib/qt-3.3/mkspecs/default -I. -I. -I/usr/lib/qt-3.3/include -o moc_qtrackingbutton.o moc_qtrackingbutton.cpp
    13. g++ -Wl,-rpath,/usr/lib/qt-3.3/lib -o app4lin app4lin.o qdoublebutton.o qtrackingbutton.o moc_qdoublebutton.o moc_qtrackingbutton.o -L/usr/lib/qt-3.3/lib -L/usr/X11R6/lib -lqt -lXext -lX11 -lm
    14. qdoublebutton.o(.text+0x0): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    15. /usr/lib/qt-3.3/include/qglist.h:150: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    16. app4lin.o(.text+0x0):/usr/lib/qt-3.3/include/qglist.h:150: first defined here
    17. qdoublebutton.o(.text+0x3a): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    18. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:16: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    19. app4lin.o(.text+0x3a):./qtrackingbutton.cxx:16: first defined here
    20. qdoublebutton.o(.text+0x74): In function `QTrackingButton::mouseMoved()':
    21. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:25: multiple definition of `QTrackingButton::mouseMoved()'
    22. app4lin.o(.text+0x74):./qtrackingbutton.cxx:25: first defined here
    23. qdoublebutton.o(.text+0x7a): In function `QTrackingButton::mouseMoveEvent(QMouseEvent*)':
    24. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:20: multiple definition of `QTrackingButton::mouseMoveEvent(QMouseEvent*)'
    25. app4lin.o(.text+0x7a):./qtrackingbutton.cxx:20: first defined here
    26. qdoublebutton.o(.text+0x80): In function `QDoubleButton::QDoubleButton(QWidget*, char*)':
    27. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.cxx:3: multiple definition of `QDoubleButton::QDoubleButton(QWidget*, char*)'
    28. app4lin.o(.text+0x80):./qdoublebutton.cxx:3: first defined here
    29. qdoublebutton.o(.text+0x266): In function `QDoubleButton::QDoubleButton(QWidget*, char*)':
    30. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.cxx:3: multiple definition of `QDoubleButton::QDoubleButton(QWidget*, char*)'
    31. app4lin.o(.text+0x266):./qdoublebutton.cxx:3: first defined here
    32. qdoublebutton.o(.text+0x44a): In function `QDoubleButton::clicked()':
    33. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.cxx:16: multiple definition of `QDoubleButton::clicked()'
    34. app4lin.o(.text+0x4ee):./qdoublebutton.cxx:16: first defined here
    35. qdoublebutton.o(.text+0x540): In function `QDoubleButton::moused()':
    36. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.cxx:21: multiple definition of `QDoubleButton::moused()'
    37. app4lin.o(.text+0x5e4):./qdoublebutton.cxx:21: first defined here
    38. qtrackingbutton.o(.text+0x0): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    39. /usr/lib/qt-3.3/include/qglist.h:150: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    40. app4lin.o(.text+0x0):app4lin.cxx: first defined here
    41. qtrackingbutton.o(.text+0x3a): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    42. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:16: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    43. app4lin.o(.text+0x3a):./qtrackingbutton.cxx:16: first defined here
    44. qtrackingbutton.o(.text+0x74): In function `QTrackingButton::mouseMoved()':
    45. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:25: multiple definition of `QTrackingButton::mouseMoved()'
    46. app4lin.o(.text+0x74):./qtrackingbutton.cxx:25: first defined here
    47. qtrackingbutton.o(.text+0x7a): In function `QTrackingButton::mouseMoveEvent(QMouseEvent*)':
    48. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:20: multiple definition of `QTrackingButton::mouseMoveEvent(QMouseEvent*)'
    49. app4lin.o(.text+0x7a):./qtrackingbutton.cxx:20: first defined here
    50. moc_qdoublebutton.o(.text+0x0): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    51. /usr/lib/qt-3.3/include/qglist.h:150: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    52. app4lin.o(.text+0x0):app4lin.cxx: first defined here
    53. moc_qdoublebutton.o(.text+0x3a): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    54. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:16: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    55. app4lin.o(.text+0x3a):./qtrackingbutton.cxx:16: first defined here
    56. moc_qdoublebutton.o(.text+0x74): In function `QTrackingButton::mouseMoved()':
    57. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:25: multiple definition of `QTrackingButton::mouseMoved()'
    58. app4lin.o(.text+0x74):./qtrackingbutton.cxx:25: first defined here
    59. moc_qdoublebutton.o(.text+0x7a): In function `QTrackingButton::mouseMoveEvent(QMouseEvent*)':
    60. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.cxx:20: multiple definition of `QTrackingButton::mouseMoveEvent(QMouseEvent*)'
    61. app4lin.o(.text+0x7a):./qtrackingbutton.cxx:20: first defined here
    62. moc_qtrackingbutton.o(.text+0x286): In function `QTrackingButton::mouseMoved()':
    63. /home/twey/devel/cpp/qt/hts/app4lin/moc_qtrackingbutton.cpp:80: multiple definition of `QTrackingButton::mouseMoved()'
    64. app4lin.o(.text+0x74):./qtrackingbutton.cxx:25: first defined here
    65. /usr/bin/ld: Warning: size of symbol `QTrackingButton::mouseMoved()' changed from 5 in app4lin.o to 31 in moc_qtrackingbutton.o
    66. collect2: ld returned 1 exit status
    67. make: *** [app4lin] Error 1
    To copy to clipboard, switch view to plain text mode 
    Project file:
    ################################################## ####################
    # Automatically generated by qmake (1.07a) Sat Jan 14 12:22:56 2006
    ################################################## ####################

    TEMPLATE = app
    INCLUDEPATH += .

    # Input
    HEADERS += qdoublebutton.h qtrackingbutton.h
    SOURCES += app4lin.cxx qdoublebutton.cxx qtrackingbutton.cxx
    /EDIT: there really ought to be scrollbars on those [quote] boxes.
    Last edited by Twey; 14th January 2006 at 14:29. Reason: Used [code] tags instead of [quote].

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    Default Re: Function previously defined in created file?

    Quote Originally Posted by Twey
    Yes. Is this not correct?
    No it's perfectly legitimate that's not the problem, I was just thinking of various things for what happens, but I still can't visualize it. When I said that you should be more descriptive I meant for the workaround you found that didn't fit your needs. If it's possible attach your sourcecode to duplicate the error.
    Quote Originally Posted by Twey
    There really ought to be scrollbars on those [Q U O T E] boxes.
    You can use the [C O D E] (without the spaces of cource) tag instead to get scrollbars

  7. #7
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    Default Re: Function previously defined in created file?

    The workaround was to keep the implementation out of both SOURCES and HEADERS groups.
    Source attached.
    Attached Files Attached Files

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    Default Re: Function previously defined in created file?

    From the assistant (Signals and Slots)
    Signals are automatically generated by the moc and must not be implemented in the .cpp file.
    Remove the implementation of your mouseMoved() and you' re done

    Edit: Also rename this slot void QDoubleButton::clicked(). It's got the same name as the signal
    Last edited by yop; 14th January 2006 at 18:02.

  9. #9
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    Default Re: Function previously defined in created file?

    Aha I did find the first problem, shortly after posting, but not the second.
    Nevertheless, I still get these:
    Qt Code:
    1. moc_qdoublebutton.o(.text+0x0): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    2. /usr/lib/qt-3.3/include/qglist.h:150: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    3. app4lin.o(.text+0x0):/usr/lib/qt-3.3/include/qglist.h:150: first defined here
    4. moc_qdoublebutton.o(.text+0x3a): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    5. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:17: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    6. app4lin.o(.text+0x3a):/home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:17: first defined here
    7. moc_qdoublebutton.o(.text+0x74): In function `QTrackingButton::mouseMoveEvent(QMouseEvent*)':
    8. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:21: multiple definition of `QTrackingButton::mouseMoveEvent(QMouseEvent*)'
    9. app4lin.o(.text+0x74):/home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:21: first defined here
    10. moc_qdoublebutton.o(.text+0x304): In function `QDoubleButton::clicked()':
    11. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:31: multiple definition of `QDoubleButton::clicked()'
    12. app4lin.o(.text+0x4ee):/home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:31: first defined here
    13. moc_qdoublebutton.o(.text+0x3fa): In function `QDoubleButton::moused()':
    14. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:36: multiple definition of `QDoubleButton::moused()'
    15. app4lin.o(.text+0x5e4):/home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:36: first defined here
    16. moc_qdoublebutton.o(.text+0x556): In function `QDoubleButton::QDoubleButton(QWidget*, char*)':
    17. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:18: multiple definition of `QDoubleButton::QDoubleButton(QWidget*, char*)'
    18. app4lin.o(.text+0x7e):/home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:18: first defined here
    19. /usr/bin/ld: Warning: size of symbol `QDoubleButton::QDoubleButton(QWidget*, char*)' changed from 488 in app4lin.o to 484 in moc_qdoublebutton.o
    20. moc_qdoublebutton.o(.text+0x73a): In function `QDoubleButton::QDoubleButton(QWidget*, char*)':
    21. /home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:18: multiple definition of `QDoubleButton::QDoubleButton(QWidget*, char*)'
    22. app4lin.o(.text+0x266):/home/twey/devel/cpp/qt/hts/app4lin/qdoublebutton.h:18: first defined here
    23. /usr/bin/ld: Warning: size of symbol `QDoubleButton::QDoubleButton(QWidget*, char*)' changed from 484 in app4lin.o to 488 in moc_qdoublebutton.o
    24. moc_qtrackingbutton.o(.text+0x364): In function `QTrackingButton::mouseMoveEvent(QMouseEvent*)':
    25. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:21: multiple definition of `QTrackingButton::mouseMoveEvent(QMouseEvent*)'
    26. app4lin.o(.text+0x74):/home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:21: first defined here
    27. moc_qtrackingbutton.o(.text+0x0): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    28. moc_qtrackingbutton.cpp: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    29. app4lin.o(.text+0x0):app4lin.cxx: first defined here
    30. moc_qtrackingbutton.o(.text+0x3a): In function `QTrackingButton::QTrackingButton(QString, QWidget*, char*)':
    31. /home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:17: multiple definition of `QTrackingButton::QTrackingButton(QString, QWidget*, char*)'
    32. app4lin.o(.text+0x3a):/home/twey/devel/cpp/qt/hts/app4lin/qtrackingbutton.h:17: first defined here
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    Default Re: Function previously defined in created file?

    Looks like missing include guards, i.e.

    Qt Code:
    1. #ifndef SOMEHEADER_H
    2. #define SOMEHEADER_H
    3.  
    4. class SomeClass
    5. {
    6. };
    7.  
    8. #endif
    To copy to clipboard, switch view to plain text mode 

    Cheers,
    _

  11. #11
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    Default Re: Function previously defined in created file?

    Nope, got them.

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    Default Re: Function previously defined in created file?

    The attached project built fine with:
    g++ --version
    g++ (GCC) 3.3.5 20050117 (prerelease) (SUSE Linux)
    qmake --version
    Qmake version: 1.07a (Qt 3.3.4)
    under Suse Linux 9.3
    A diff with your files will be usefull
    Attached Files Attached Files

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    Default Re: Function previously defined in created file?

    Yes, builds here too. diff attached.

    /EDIT: Of more interest might be this diff between your project and the same project when declaration and implementation are cat'ed into one file, which gives the same errors as above.
    Attached Files Attached Files
    Last edited by Twey; 14th January 2006 at 20:27. Reason: Well, I thought the diff was attached...

  14. #14
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    Default Re: Function previously defined in created file?

    Apparently that was the problem

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    Default Re: Function previously defined in created file?

    Quote Originally Posted by yop
    Quote Originally Posted by Myself
    Is this [putting definition and implementation in the same file] not correct?
    No it's perfectly legitimate that's not the problem
    If that's so, I don't understand why it should be a problem :-\

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    Default Re: Function previously defined in created file?

    Yes it's food for thought, I've been googling around for it but I can't seem to find any answers . It was a trial and error process for me too. It really felt right to have it in the header file (I would have told you to remove them in the first place) but apparenty it's not.

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    Default Re: Function previously defined in created file?

    Quote Originally Posted by Twey
    If that's so, I don't understand why it should be a problem :-\
    In such case you must add a hint for qmake that it should run moc program on your .cpp file, as it only checks headers for Q_OBJECT.

    You have to add:
    Qt Code:
    1. #include "filename.moc"
    To copy to clipboard, switch view to plain text mode 
    at the end of a file.

    Edit: OK, forget it. I should check your program before posting. The problem is different.
    Last edited by jacek; 14th January 2006 at 21:23.

  18. #18
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    Default Re: Function previously defined in created file?

    Quote Originally Posted by jacek
    In such case you must add a hint for qmake that it should run moc program on your .cpp file, as it only checks headers for Q_OBJECT.
    But the files were headers.
    Also, yop, when the second button in your code (b2) is connected to the moused() slot, nothing happens.

  19. #19
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    Default Re: Function previously defined in created file?

    Quote Originally Posted by jacek
    In such case you must add a hint for qmake that it should run moc program on your .cpp file, as it only checks headers for Q_OBJECT.

    You have to add:
    Qt Code:
    1. #include "filename.moc"
    To copy to clipboard, switch view to plain text mode 
    at the end of a file.
    Don't you get a vtable blah blah error in that case? There is an undefined reference error here. Ok I'll shut up and reboot linux to check it out myself...

    Quote Originally Posted by jacek
    Edit: OK, forget it. I should check your program before posting. The problem is different.
    Edit: Ok no need to check it out then
    Last edited by yop; 14th January 2006 at 21:29.

  20. #20
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    Default Re: Function previously defined in created file?

    Quote Originally Posted by Twey
    Also, yop, when the second button in your code (b2) is connected to the moused() slot, nothing happens.
    I only tried to compile not add any functionality

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