[Qt-interest] static linking

[Eckhard Jokisch]

The QT-library has to be configured in a way that it can be lnked static.
AFAIK it's ./confgure -static 
This gives also different names for the libraries.
Of course you have to compile and install QT after that ./configure -static

Then you have to select the correct QT-version also in QT-Creator (if you use 
that ) and rebuild all.

Cheers
Eckhard


On Thursday 28 May 2009 11:37:08 Oliver Demetz wrote:
> Hi,
>
> I'm not a 100% sure about that, but
> as fas as I know you have to compile
> the qt library with special settings
> if you want to link your program
> statically against it.
>
> I would also be interested in details
> on that.
>
> Best regards,
> Oliver
>
> Linda Maria schrieb:
> >     Linda Maria wrote:
> >      > Hi all
> >      >
> >      > I want to statically link my own libs, however, still dynamically
> >      > linking against Qt. When I do this I get undefined reference
> >      > error. Well, it is clear that the compiler is not finding my
> >      > lib/somename/.a file, however, if I compile my library dynamically
> >      > the compiler
> >
> >     has no
> >
> >      > problem finding /somename/.dll file.
> >      >
> >      > -I am working with QT 4.5
> >      > -I am working on Windows with Qt Creator
> >      >
> >      > Example .pro files are as folow:
> >      >
> >      > lib pro file:
> >      > QT -= gui
> >      >
> >      > TARGET = hello_world_lib
> >      >
> >      > TEMPLATE = lib
> >      >
> >      > CONFIG += staticlib
> >      >
> >      > DEFINES += HELLO_WORLD_LIB_LIBRARY
> >      >
> >      > SOURCES += helloworld.cpp
> >      >
> >      > HEADERS += helloworld.h\
> >      >
> >      > hello_world_lib_global.h
> >      >
> >      >
> >      >
> >      > app pro file:
> >      >
> >      > TARGET = hello_world
> >      >
> >      > TEMPLATE = app
> >      >
> >      > INCLUDEPATH += ..\hello_world_lib
> >      >
> >      > CONFIG += static
> >      >
> >      > LIBS += -L..\hello_world_lib\debug -lhello_world_lib
> >      >
> >      > TARGETDEPS += ..\hello_world_lib\debug\libhello_world_lib.a
> >      >
> >      > SOURCES += main.cpp \
> >      >
> >      > mainwindow.cpp \
> >      >
> >      > helloworlddialog.cpp
> >      >
> >      > HEADERS += mainwindow.h \
> >      >
> >      > helloworlddialog.h
> >      >
> >      > FORMS += mainwindow.ui \
> >      >
> >      > helloworlddialog.ui \
> >      >
> >      > helloworlddialog.ui
> >      >
> >      >
> >      >
> >      > ld output is:
> >      >
> >      > debug/mainwindow.o(.text+0x1bd): In function
> >      > `ZN10HelloWorld10MainWindowC2EP7QWidget':
> >      >
> >      > C:/Documents and Settings/es030699/My
> >      > Documents/Qt/hello_world/mainwindow.cpp:15: undefined reference to
> >      > `_imp___ZN13HelloWorldLib10HelloWorld10getMessageEv'
> >      >
> >      > debug/mainwindow.o(.text+0x3cb): In function
> >      > `ZN10HelloWorld10MainWindowC1EP7QWidget':
> >      >
> >      > C:/Documents and Settings/es030699/My
> >      > Documents/Qt/hello_world/mainwindow.cpp:15: undefined reference to
> >      > `_imp___ZN13HelloWorldLib10HelloWorld10getMessageEv'
> >      >
> >      > collect2: ld returned 1 exit status
> >      >
> >      > mingw32-make.exe[1]: *** [debug\hello_world.exe] Error 1
> >      >
> >      > C:\MinGW\bin\mingw32-make.exe: *** [debug] Error 2
> >      >
> >      > Exited with code 2.
> >      >
> >      > Error while building project hello_world
> >      >
> >      > When executing build step 'Make'
> >      >
> >      >
> >      >
> >      > Notice the line
> >      >
> >      > CONFIG += staticlib
> >      >
> >      > in the lib pro file tellst the compiler to create
> >
> >     libhello_world_lib.a
> >
> >      > to statically link agains, and not to create hello_world_lib.dll.
> >      > I thought the compiler should automatically find out that only a
> >      > static library is provided and link against it.
> >      >
> >      >
> >      >
> >      > Can someone please help me with this?
> >      >
> >      > Thanks,
> >      >
> >      > Linda Maria
> >
> >     I do what you are trying to do routinely on both Windows and Linux.
> >     However, in my library .pro files, I have
> >     CONFIG += static
> >     not staticlib.
> >     You might look at the Makefiles that are generated by qmake and see
> > what they look like.
> >
> >
> > Hi and thanks for the reply
> >
> > I am still having problem with static linking. In the moment I am using
> > dynamic linking (not what I want). The output from the compiler is as
> > follow and the makefile is attached.
> >
> > Please you guys that are experts on Qt, give me a hand on this.
> > Thanks,
> > Linda Maria
> >
> > Running build steps for project hello_world...
> >
> > Starting: C:/Qt/4.5.1/bin/qmake.exe C:/Documents and
> > Settings/es030699/My Documents/Qt/hello_world/hello_world.pro
> > <http://hello_world.pro> -spec win32-g++ -r
> >
> > Exited with code 0.
> >
> > Starting: C:/MinGW/bin/mingw32-make.exe -w
> >
> > C:\MinGW\bin\mingw32-make.exe: Entering directory `C:/Documents and
> > Settings/es030699/My Documents/Qt/hello_world'
> >
> > C:/MinGW/bin/mingw32-make.exe -f Makefile.Debug
> >
> > Makefile.Debug:126: warning: overriding commands for target
> > `ui_helloworlddialog.h'
> >
> > Makefile.Debug:123: warning: ignoring old commands for target
> > `ui_helloworlddialog.h'
> >
> > mingw32-make.exe[1]: Entering directory `C:/Documents and
> > Settings/es030699/My Documents/Qt/hello_world'
> >
> > g++ -enable-stdcall-fixup -Wl,-enable-auto-import
> > -Wl,-enable-runtime-pseudo-reloc -mthreads -Wl -Wl,-subsystem,windows -o
> > debug\hello_world.exe debug/main.o debug/mainwindow.o
> > debug/helloworlddialog.o debug/moc_mainwindow.o
> > debug/moc_helloworlddialog.o -L"c:\Qt\4.5.1\lib" -lmingw32 -lqtmaind
> > -L..\hello_world_lib\debug -lhello_world_lib -lQtGuid4 -lQtCored4
> >
> > mingw32-make.exe[1]: Leaving directory `C:/Documents and
> > Settings/es030699/My Documents/Qt/hello_world'
> >
> > C:\MinGW\bin\mingw32-make.exe: Leaving directory `C:/Documents and
> > Settings/es030699/My Documents/Qt/hello_world'
> >
> > debug/mainwindow.o(.text+0x1bd): In function
> > `ZN10HelloWorld10MainWindowC2EP7QWidget':
> >
> > C:/Documents and Settings/es030699/My
> > Documents/Qt/hello_world/mainwindow.cpp:15: undefined reference to
> > `_imp___ZN13HelloWorldLib10HelloWorld10getMessageEv'
> >
> > debug/mainwindow.o(.text+0x3cb): In function
> > `ZN10HelloWorld10MainWindowC1EP7QWidget':
> >
> > C:/Documents and Settings/es030699/My
> > Documents/Qt/hello_world/mainwindow.cpp:15: undefined reference to
> > `_imp___ZN13HelloWorldLib10HelloWorld10getMessageEv'
> >
> > collect2: ld returned 1 exit status
> >
> > mingw32-make.exe[1]: *** [debug\hello_world.exe] Error 1
> >
> > C:\MinGW\bin\mingw32-make.exe: *** [debug] Error 2
> >
> > Exited with code 2.
> >
> > Error while building project hello_world
> >
> > When executing build step 'Make'
> >
> >
> >
> >
> >
> >
> >
> >
> > ------------------------------------------------------------------------
> >
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