Cross compiling page in techbase

[Alexander Neundorf]

On Thursday 13 March 2008, Carlo wrote:
> On Thu, Mar 13, 2008 at 7:07 PM, Alexander Neundorf <neundorf at kde.org> 
wrote:
> > On Thursday 13 March 2008, Carlo wrote:
> >  > On Thu, Mar 13, 2008 at 1:11 AM, Alexander Neundorf <neundorf at kde.org>
> >
> >  wrote:
> >  ...
> >
> > > >  Is that using the modified FindKDE4.cmake ?
> > > >
> >  > >  mingw32-kdelibs.cmake sets KDE4_DATA_DIR, and if this is set,
> >  > > FindKDE4.cmake should use it to load FindKDE4Internal.cmake, which
> >  > > will load
> >  > >  KDELibsDependencies.cmake, which contains all these settings from
> >  > > the installed kdelibs.
> >  > >
> >  > >  What is going wrong ?
> >  > >  How does the installed KDELibsDependencies.cmake look like, i.e.
> >  > > are the paths in that file the same as the real locations ?
> >  >
> >  > Yes it uses the modified FindKDE4.cmake  and KDE4_DATA_DIR is set
> >  > the problem is that  KDELibsDependencies.cmake uses
> >  > ${KDE4_INSTALL_DIR} that is retrieved from this code
> >  > get_filename_component(_DIR ${KDE4_KDECONFIG_EXECUTABLE} PATH )
> >  > get_filename_component(KDE4_INSTALL_DIR ${_DIR} PATH )
> >  > but KDE4_KDECONFIG_EXECUTABLE is setted to the linux one, if i set it
> >  > to the windows one it goes ahead and it find include and library dir
> >  > but it doesn't find kde4automoc and kconfig_compiler
> >  > -- Found KDE 4.1 include dir: /windows/kde4/include
> >  > -- Found KDE 4.1 library dir: /windows/kde4/lib
> >  > -- Didn't find the KDE4 kconfig_compiler preprocessor
> >  > -- Didn't find the KDE4 automoc
> >
> >  Please update your FindKDE4Internal.cmake, I committed a change so that
> > now KDE4_INSTALL_DIR is determined relative to the location of the
> > installed FindKDE4Internal.cmake instead of kde4-config.exe. This should
> > help for now for this problem.
> >
> >  > > > for some strange reason for kde4automoc it calls
> >  > > > ../bin/kde4automoc instead of ../bin/kde4automoc.exe one that's
> >  > > > why i made the link in
> >  > >
> >  > >  Is the .exe extension really required to run the executable ?
> >  > >  Under Windows it isn't. Is this a wine speciality ?
> >  >
> >  > no, the problem here is that cmake wants to run makekdewidgets.exe,
> >  > maybe it tries to run makekdewidgets.exe.bat while kde4automoc is
> >  > called directly
> >
> >  Ok, I lost track.
> >  How does it call makekdewidgets, how does it call kde4automoc, and which
> > of the two is the problem ?
>
> kde4automoc is called in this way
> cd /home/kdeuser/kde/src/KDE/kdelibs/build/kdewidgets &&
> ../bin/kde4automoc
> /home/kdeuser/kde/src/KDE/kdelibs/build/kdewidgets/makekdewidgets_automoc.c
>pp /home/kdeuser/kde/src/KDE/kdelibs/kdewidgets
> /home/kdeuser/kde/src/KDE/kdelibs/build/kdewidgets
> /home/kdeuser/kde/src/qt-copy/bin/moc
>
> while makekdewidgets
> cd /home/kdeuser/kde/src/KDE/kdelibs/build/kdewidgets &&
> ../bin/makekdewidgets.exe -o
> /home/kdeuser/kde/src/KDE/kdelibs/build/kdewidgets/kdewidgets.cpp
> /home/kdeuser/kde/src/KDE/kdelibs/kdewidgets/kde.widgets
>
> so here the problem is that we should call makekdewidgets without the
> .exe extension otherwise it's runned by wine

Ah, ok.
I'll check why it behaves differently.
If we would require cmake 2.6 we would have full support for this problem, 
I'll see if we can get it to work with having cmake 2.6 only optionally.

> >  > >  Ok. This is as far as I see always undefined references from
> >  > > QtUiTools to QtCore:
> >  > > /windows/kde4/lib/libQtUiTools.a(quiloader.o):quiloader.cpp:(.text+0
> >  > >x7fd): undefined reference to `__imp___ZNK7QString6toUtf8Ev'
> >  > >
> >  > >  Which value does QT_QTUITOOLS_LIBRARY have ?
> >  >
> >  > /windows/kde4/lib/libQtUiTools.a
> >  > anyway I've find out that it could be fixed by just removing
> >  > /windows/kde4/lib/libQtCore4.a and adding -lQtCore4 instead of every
> >  > Qt lib
> >
> >  Is libQtUiTools.a a static or a shared library ?
> >  Don't they usually have the suffix .dll or .lib ?
>
> it should be a shared library, i'm not sure but i think that .dll are
> needed for runtime, while .a are just for linking and .lib are static
> library compiled with visual c++, btw i get this error with both qt4
> from the kdewin installer and the precompiled one from trolltech

Does it work if you set QT_QTUITOOLS_LIBRARY to the QtUiTools library followed 
by the QtCore library ? This should fix the undefined references.

Alex