[Qt-interest] static linking

Oliver Demetz forenbeitraege at oliverdemetz.de
Thu May 28 13:24:13 CEST 2009 

Hmmm, ok

but "trying" takes 3 or 4 hours ;-)
And I do not want to risk to not be
able to build my app afterwards.

Is there anybody that just knows whether
its possible to maintain both versions
of the qt libs side by side?

Thanks in advance,
Oliver

Eckhard Jokisch schrieb:
> 
> You will have to try it ;)
> And pls. use the "reply to all" or "reply to list" function when 
> responding ;)
> 
> 
> Regards
> Eckhard
> 
> 
> On Thursday 28 May 2009 12:25:50 Oliver Demetz wrote:
>  > Hi,
>  > thanks for this clarifying answer!
>  > Next question: is it possible to build
>  > qt for both, static and dynamic linkage
>  > and to be able to simply choose the
>  > wanted configuration afterwards?
>  > In the best case, it would be nice to
>  > have both configurations (or libs) in
>  > the same directory and to not have to
>  > alter the paths and so on.
>  >
>  > Regards,
>  > Oliver
>  >
>  > Eckhard Jokisch schrieb:
>  > > 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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