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  1. 25th March 2006, 12:58 #1
    jacek
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    Default Re: linking libraries

    Quote Originally Posted by JustaStudent
    That solution is for Qt 4.x, and I'm using Qt 3.3.4. (I found it in the 4.x manual, but not in the 3.3 manual)
    Here's the contents of $QTDIR/mkspecs/features/link_pkgconfig.prf file from Qt4:
    # handle pkg-config files
    for(PKGCONFIG_LIB, $$list($$unique(PKGCONFIG))) {
    QMAKE_CXXFLAGS += $$system(pkg-config --cflags $$PKGCONFIG_LIB)
    LIBS += $$system(pkg-config --libs $$PKGCONFIG_LIB)
    }
    It should work with Qt3 also.
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  2. 25th March 2006, 15:21 #2
    JustaStudent
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    Default Re: linking libraries

    jacek, this solution works also for Qt 3.3.4. (with a little modification)

    I edit /usr/share/qt3/mkspecs/default/qmake.conf (after making backup) and the lines

    QMAKE_CFLAGS = -pipe

    to

    QMAKE_CFLAGS = -pipe `pkg-config vortex --cflags`

    and

    QMAKE_LIBS =

    to

    QMAKE_LIBS =`pkg-config vortex --libs`


    save it, run qmake -o Makefile client again, and then make.

    but still I get the same error message:

    Qt Code: 
    1. g++  -o client .obj/client.o    -L/usr/share/qt3/lib -L/usr/X11R6/lib `pkg-config vortex --libs` -lqt-mt -lXext -lX11 -lm -lpthread
    2. .obj/client.o: In function `main':
    3. client.cpp:(.text+0x2a6): undefined reference to `vortex_init()'
    4. collect2: ld returned 1 exit status
    5. make: *** [client] Error 1
    To copy to clipboard, switch view to plain text mode 

    wysota, what do you mean with 'parameters passed to the compiler in the linking stage'?
    After above error, it stops compiling..
    Last edited by JustaStudent; 25th March 2006 at 15:50.
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  3. 25th March 2006, 15:58 #3
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    Default Re: linking libraries

    What does pkg-config vortex --libs return?
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  4. 25th March 2006, 16:14 #4
    JustaStudent
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    Default Re: linking libraries

    pkg-config vortex --libs
    -pthread -L/usr/local/lib -lvortex -lgthread-2.0 -lxml2 -lz -lm -lglib-2.0

    pkg-config vortex --cflags
    -pthread -I/usr/local/include/vortex -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2


    I'll wait with the install of Qt 4.1.1 until I know for sure it won't mess up my current configuration.
    Last edited by JustaStudent; 25th March 2006 at 16:22.
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  5. 25th March 2006, 16:46 #5
    jacek
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    Default Re: linking libraries

    Quote Originally Posted by JustaStudent
    I edit /usr/share/qt3/mkspecs/default/qmake.conf (after making backup) and the lines
    It would be better if you would add:
    Qt Code: 
    1. QMAKE_CXXFLAGS += $$system(pkg-config --cflags vortex)
    2. LIBS += $$system(pkg-config --libs vortex)
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    to your .pro file.
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  6. 25th March 2006, 18:54 #6
    JustaStudent
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    Default Re: linking libraries

    ok I restored my qmake.conf file and added

    QMAKE_CXXFLAGS += $$system(pkg-config --cflags vortex)
    LIBS += $$system(pkg-config --libs vortex)

    to my .pro file

    but still I get the same error message "undefined reference to vortex_init()"

    Any ideas?
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  7. 25th March 2006, 19:18 #7
    jacek
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    Default Re: linking libraries

    Have you run "make clean && qmake && make" after all these changes?
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  8. 25th March 2006, 19:54 #8
    JustaStudent
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    Default Re: linking libraries

    > more dummy.cpp

    Qt Code: 
    1. #include <qapplication.h>
    2. #include <vortex.h>
    3.  
    4. int main( )
    5. {
    6.     vortex_init();
    7. }
    To copy to clipboard, switch view to plain text mode 

    > more dummy.pro

    Qt Code: 
    1. TEMPLATE        = app
    2. LANGUAGE        = C++
    3.  
    4. CONFIG  += qt warn_on release
    5.  
    6. SOURCES += dummy.cpp
    7.  
    8. FORMS   = form1.ui
    9.  
    10. QMAKE_CXXFLAGS += $$system(pkg-config --cflags vortex)
    11. LIBS += $$system(pkg-config --libs vortex)
    12.  
    13. unix {
    14.   UI_DIR = .ui
    15.   MOC_DIR = .moc
    16.   OBJECTS_DIR = .obj
    17. }
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    > make clean && qmake && make

    Qt Code: 
    1. rm -f .obj/moc_form1.o
    2. rm -f .moc/moc_form1.cpp
    3. rm -f .ui/form1.cpp .ui/form1.h
    4. rm -f .obj/dummy.o .obj/form1.o
    5. rm -f *~ core *.core
    6. /usr/share/qt3/bin/uic form1.ui -o .ui/form1.h
    7. g++ -c -pipe -pthread -I/usr/local/include/vortex -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I/usr/include/qt3 -I.ui/ -I. -I.moc/ -o .obj/dummy.o dummy.cpp
    8. /usr/share/qt3/bin/uic form1.ui -i form1.h -o .ui/form1.cpp
    9. g++ -c -pipe -pthread -I/usr/local/include/vortex -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I/usr/include/qt3 -I.ui/ -I. -I.moc/ -o .obj/form1.o .ui/form1.cpp
    10. /usr/include/qt3/qtooltip.h:86: warning: ‘class QToolTip’ has virtual functions but non-virtual destructor
    11. /usr/share/qt3/bin/moc .ui/form1.h -o .moc/moc_form1.cpp
    12. g++ -c -pipe -pthread -I/usr/local/include/vortex -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I/usr/include/qt3 -I.ui/ -I. -I.moc/ -o .obj/moc_form1.o .moc/moc_form1.cpp
    13. /usr/include/qt3/private/qucom_p.h:69: warning: ‘struct QUBuffer’ has virtual functions but non-virtual destructor
    14. /usr/include/qt3/private/qucom_p.h:77: warning: ‘struct QUType’ has virtual functions but non-virtual destructor
    15. /usr/include/qt3/private/qucom_p.h:104: warning: ‘struct QUType_Null’ has virtual functions but non-virtual destructor
    16. /usr/include/qt3/private/qucom_p.h:287: warning: ‘struct QUType_enum’ has virtual functions but non-virtual destructor
    17. /usr/include/qt3/private/qucom_p.h:307: warning: ‘struct QUType_ptr’ has virtual functions but non-virtual destructor
    18. /usr/include/qt3/private/qucom_p.h:326: warning: ‘struct QUType_iface’ has virtual functions but non-virtual destructor
    19. /usr/include/qt3/private/qucom_p.h:345: warning: ‘struct QUType_idisp’ has virtual functions but non-virtual destructor
    20. /usr/include/qt3/private/qucom_p.h:364: warning: ‘struct QUType_bool’ has virtual functions but non-virtual destructor
    21. /usr/include/qt3/private/qucom_p.h:383: warning: ‘struct QUType_int’ has virtual functions but non-virtual destructor
    22. /usr/include/qt3/private/qucom_p.h:403: warning: ‘struct QUType_double’ has virtual functions but non-virtual destructor
    23. /usr/include/qt3/private/qucom_p.h:423: warning: ‘struct QUType_charstar’ has virtual functions but non-virtual destructor
    24. /usr/include/qt3/private/qucom_p.h:444: warning: ‘struct QUType_QString’ has virtual functions but non-virtual destructor
    25. /usr/include/qt3/private/qucomextra_p.h:65: warning: ‘struct QUType_QVariant’ has virtual functions but non-virtual destructor
    26. /usr/include/qt3/private/qucomextra_p.h:87: warning: ‘struct QUType_varptr’ has virtual functions but non-virtual destructor
    27. g++  -o dummy .obj/dummy.o .obj/form1.o .obj/moc_form1.o   -L/usr/share/qt3/lib -L/usr/X11R6/lib -pthread -L/usr/local/lib -lvortex -lgthread-2.0 -lxml2 -lz -lglib-2.0 -lqt-mt -lXext -lX11 -lm -lpthread
    28. .obj/dummy.o: In function `main':
    29. dummy.cpp:(.text+0xd): undefined reference to `vortex_init()'
    30. collect2: ld returned 1 exit status
    31. make: *** [dummy] Error 1
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  9. 25th March 2006, 20:24 #9
    jacek
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    Default Re: linking libraries

    Does it link when you remove #include <qapplication.h> and change:
    Qt Code: 
    1. CONFIG += qt warn_on release
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    to
    Qt Code: 
    1. CONFIG += warn_on release
    2. CONFIG -= qt
    To copy to clipboard, switch view to plain text mode 
    ?
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  10. The following user says thank you to jacek for this useful post:

    JustaStudent (25th March 2006)
  11. 25th March 2006, 20:42 #10
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    Default Re: linking libraries

    Qt Code: 
    1. // main.cpp
    2. #include <vortex.h>
    3.  
    4. void main( ){
    5.     vortex_init();
    6. }
    To copy to clipboard, switch view to plain text mode 

    Qt Code: 
    1. g++ main.cpp `pkg-config vortex --cflags --libs` -o test
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    Does this compile?
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    JustaStudent (25th March 2006)
  13. 25th March 2006, 20:55 #11
    JustaStudent
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    Red face Re: linking libraries (problem solved. fault; library was c, I compiled c++)

    I found the problem! It is my bad actually, the Vortex library is a C library, not a C++ library.
    So,

    I changed the name of dummy.cpp to dummy.c,
    I changed CXXFLAGS to CFLAGS in dummy.pro as below, then run

    make clean && qmake && make.

    Code compiled! I feel stupid that I did not realise this earlier!
    Thank you for the troubleshooting!

    > more dummy.c

    Qt Code: 
    1. #include <vortex.h>
    2.  
    3. int main( )
    4. {
    5.     vortex_init();
    6. }
    To copy to clipboard, switch view to plain text mode 

    > more dummy.pro

    Qt Code: 
    1. TEMPLATE        = app
    2. LANGUAGE        = C++
    3.  
    4. CONFIG  += qt warn_on release
    5.  
    6. SOURCES += dummy.c
    7.  
    8. LIBS += $$system(pkg-config --libs vortex)
    9.  
    10. QMAKE_CFLAGS += $$system(pkg-config --cflags vortex)
    11.  
    12. unix {
    13.   UI_DIR = .ui
    14.   MOC_DIR = .moc
    15.   OBJECTS_DIR = .obj
    16. }
    To copy to clipboard, switch view to plain text mode 

    > make clean && qmake && make

    Qt Code: 
    1. qmake -o Makefile dummy.pro
    2. rm -f .obj/dummy.o
    3. rm -f *~ core *.core
    4. gcc -c -pipe -pthread -I/usr/local/include/vortex -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I/usr/include/qt3 -I.ui/ -I.moc/ -o .obj/dummy.o dummy.c
    5. dummy.c: In function ‘main’:
    6. dummy.c:6: warning: control reaches end of non-void function
    7. g++  -o dummy .obj/dummy.o    -L/usr/share/qt3/lib -L/usr/X11R6/lib -pthread -L/usr/local/lib -lvortex -lgthread-2.0 -lxml2 -lz -lglib-2.0 -lqt-mt -lXext -lX11 -lm -lpthread
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  14. 25th March 2006, 21:19 #12
    jacek
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    Default Re: linking libraries (problem solved. fault; library was c, I compiled c++)

    Quote Originally Posted by JustaStudent
    I found the problem! It is my bad actually, the Vortex library is a C library, not a C++ library.
    Then you should use Vortex headers like this:
    Qt Code: 
    1. extern "C" {
    2. #include <vortex.h>
    3. };
    To copy to clipboard, switch view to plain text mode 
    Athough it's strange that Vortex authors didn't take care of it.
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  15. 25th March 2006, 21:49 #13
    JustaStudent
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    Default Re: linking libraries

    Right. Thanks again for the help! Youv'e saved me some days to finish a prototype of the project

    (I renamed file to dummy.cpp and used CXXFLAGS again in dummy.pro, then put extern "C" in dummy.cpp as you mentioned & recompiled)
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  16. 18th April 2006, 16:45 #14
    JustaStudent
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    Default Re: linking libraries

    Ok, now to the next problem.. This should fit under the same topic.

    I want to build a static executable with this vortex library included. I have tried putting "static" in my "CONFIG +=" in my .pro file, but that just makes no difference. (same size of executable, and not working on other machine with same distro)
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  17. 18th April 2006, 21:42 #15
    jacek
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    Default Re: linking libraries

    Do you have a static version of that library?
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