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Thread: Make environement problem: `Qt' undeclared (first use in this function)

  1. 24th June 2009, 07:55 #1
    JPNaude
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    Default Make environement problem: `Qt' undeclared (first use in this function)

    Hi

    I've been using Qt Creator for a while now and yesterday I created a new shared library using the Qt Creator wizard, but the compilation of the library doesn't want to get through compilation.

    The error messages are below:

    Qt Code: 
    1. In file included from c:/Tools/Qt/2009.02/qt/include/QtCore/qnamespace.h:1,
    2. from c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/kernel/qobjectdefs.h:45,
    3. from c:/Tools/Qt/2009.02/qt/include/QtCore/qobjectdefs.h:1,
    4. from c:/Tools/Qt/2009.02/qt/include/QtGui/../../src/gui/kernel/qwindowdefs.h:45,
    5. from c:/Tools/Qt/2009.02/qt/include/QtGui/qwindowdefs.h:1,
    6. from c:/Tools/Qt/2009.02/qt/include/QtGui/../../src/gui/kernel/qwidget.h:45,
    7. from c:/Tools/Qt/2009.02/qt/include/QtGui/qwidget.h:1,
    8. from c:/Tools/Qt/2009.02/qt/include/QtGui/QWidget:1,
    9. from include\QtObserverLibrary\ObserverCollectionDetailsWidget.h:4:
    10. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:54: error: syntax error before "namespace"
    11. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:58: error: syntax error before '{' token
    12. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:135: warning: return type defaults to `int'
    13. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h: In function `Q_DECLARE_FLAGS':
    14. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:136: error: `Qt' undeclared (first use in this function)
    15. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:136: error: (Each undeclared identifier is reported only once
    16. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:136: error: for each function it appears in.)
    17. c:/Tools/Qt/2009.02/qt/include/QtCore/../../src/corelib/global/qnamespace.h:136: confused by earlier errors, bailing out
    18. mingw32-make[1]: Leaving directory `D:/ScinericSoftware/Products/QtObserverLibrary/trunk'
    19. mingw32-make: Leaving directory `D:/ScinericSoftware/Products/QtObserverLibrary/trunk'
    20. mingw32-make[1]: *** [tmp/ObserverCollectionDetailsWidget.o] Error 1
    21. mingw32-make: *** [debug] Error 2
    22. Exited with code 2.
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    And below is my .pro file:

    qmake Code: 
    1. CONFIG   += qt dll ordered
    2. QT       += xml
    3.  
    4. TARGET = QtObserverLibrary
    5. TEMPLATE = lib
    6.  
    7. DEFINES += QTOBSERVERLIBRARY_LIBRARY
    8.  
    9. DEPENDPATH += include/QtObserverLibrary \
    10.               source
    11. INCLUDEPATH += include/QtObserverLibrary \
    12.                source
    13.  
    14. win32:UI_HEADERS_DIR  = include/QtObserverLibrary
    15. win32:DLLDESTDIR      = bin
    16. win32:DESTDIR         = bin
    17. win32:OBJECTS_DIR     = tmp
    18. win32:MOC_DIR         = tmp
    19. win32:RCC_DIR         = tmp
    20. win32:UI_DIR          = tmp
    21.  
    22. + Some headers, forms and sources
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    Maybe I'm missing something simple, but I just can't seem to get it working. Shouldn't the Qt environment exposed to make by default?

    Thanks for any inputs,
    Regards,
    Jaco
    Last edited by wysota; 24th June 2009 at 12:11.
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  2. 24th June 2009, 09:19 #2
    shentian
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    Default Re: Make environement problem: `Qt' undeclared (first use in this function)

    Just a wild guess: Maybe there's something wrong in a header file included before <QWidget>. Put #include <QWidget> on the first line of ObserverCollectionDetailsWidget.h and try again.
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  3. 24th June 2009, 09:33 #3
    JPNaude
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    Default Re: Make environement problem: `Qt' undeclared (first use in this function)

    Hi

    Thanks for the guess, but nope its not the problem:

    Qt Code: 
    1. #ifndef OBSERVERCOLLECTIONDETAILSWIDGET_H
    2. #define OBSERVERCOLLECTIONDETAILSWIDGET_H
    3.  
    4. #include <QWidget>
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    Its not related to a specific file, its related to the project setup I believe.
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  4. 24th June 2009, 12:13 #4
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    wysota
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    Default Re: Make environement problem: `Qt' undeclared (first use in this function)

    What happens if you remove "CONFIG+=qt" from the project? Also do you have a class or namespace called Qt in your own code?
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  5. 24th June 2009, 12:33 #5
    JPNaude
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    Default Re: Make environement problem: `Qt' undeclared (first use in this function)

    1) Removing the Config += qt line does not help, no.
    2) I'm sure I don't have any Qt namespace in my project.

    Below is the gcc call that is generated by Qt Creator:

    Qt Code: 
    1. gcc -c -g -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQTOBSERVERLIBRARY_LIBRARY -DQT_DLL -DQT_XML_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I"c:\Tools\Qt\2009.02\qt\include\QtCore" -I"c:\Tools\Qt\2009.02\qt\include\QtGui" -I"c:\Tools\Qt\2009.02\qt\include\QtXml" -I"c:\Tools\Qt\2009.02\qt\include" -I"include\QtObserverLibrary" -I"source" -I"c:\Tools\Qt\2009.02\qt\include\ActiveQt" -I"tmp" -I"include\QtObserverLibrary" -I"c:\Tools\Qt\2009.02\qt\mkspecs\win32-g++" -o tmp\ObserverCollectionDetailsWidget.o include\QtObserverLibrary\ObserverCollectionDetailsWidget.h
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    And below is the gcc call from a different project which works fine:

    Qt Code: 
    1. g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"c:\Tools\Qt\2009.02\qt\include\QtCore" -I"c:\Tools\Qt\2009.02\qt\include\QtGui" -I"c:\Tools\Qt\2009.02\qt\include" -I"c:\Tools\Qt\2009.02\qt\include\ActiveQt" -I"debug" -I"." -I"c:\Tools\Qt\2009.02\qt\mkspecs\win32-g++" -o debug\main.o main.cpp
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    The only difference that I can see is -DQT_NEEDS_QMAIN. But adding this define to the shared library project does not resolve anything.
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  6. 24th June 2009, 14:16 #6
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    Default Re: Make environement problem: `Qt' undeclared (first use in this function)

    Both lines look fine to me. The error has to be in your source file. Try deleting it and typing in the contents manually again (don't paste it as you could paste some non-readable character).
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  7. 24th June 2009, 14:27 #7
    JPNaude
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    Default Re: Make environement problem: `Qt' undeclared (first use in this function)

    Thanks for the reply again Wysota.

    I figured it out, and it was my mistake. I accidentally had all my sources under HEADERS += and all my headers under SOURCES +=.

    Thanks again,
    Regards,
    Jaco
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