Strange build error

[Sahil Sehgal]

On 04-Dec-2014 8:43 pm, "Myriam Schweingruber" <myriam at kde.org> wrote:
>
> Hi all,
>
> as a Google Code-In Beginner task students are asked to build Amarok from
source. Today we ran into a very strange error a student experienced, which
I can't reproduce here, despite using the same distribution (Kubuntu 14.10)
and Qt version:
>
> [ 10%] Built target amarokshared_automoc
> [ 10%] Built target amarokshared
> [ 10%] Built target amaroklib_automoc
> [ 10%] Built target amarokcore_automoc
> Linking CXX shared library ../../lib/libamarokcore.so
> [ 10%] Built target amarokcore
> [ 10%] Built target amarokpud
> [ 10%] Built target amarokocsclient_automoc
> [ 10%] Built target amarokocsclient
> [ 10%] Built target amarok-transcoding_automoc
> Linking CXX shared library ../../lib/libamarok-transcoding.so
> [ 10%] Built target amarok-transcoding
> [ 10%] Building CXX object
src/CMakeFiles/amaroklib.dir/amaroklib_automoc.o
> In file included from
/home/pcchou/project/gci/amarok/src/amaroklib_automoc.cpp:4:0:
> /home/pcchou/project/gci/amarok/src/moc_PlaylistProviderExporter.cpp: In
member function ‘virtual int
AmarokScript::PlaylistProviderPrototype::qt_metacall(QMetaObject::Call,
int, void**)’:
>
/home/pcchou/project/gci/amarok/src/moc_PlaylistProviderExporter.cpp:145:55:
error: invalid use of incomplete type ‘class QIcon’
>          case 3: *reinterpret_cast< QIcon*>(_v) = icon(); break;
>                                                        ^
> In file included from /usr/include/qt4/QtCore/QMetaType:1:0,
>                  from
/home/pcchou/project/gci/amarok/src/core/playlists/Playlist.h:24,
>                  from
/home/pcchou/project/gci/amarok/src/core/playlists/PlaylistProvider.h:21,
>                  from
/home/pcchou/project/gci/amarok/src/scripting/scriptengine/exporters/PlaylistProviderExporter.h:21,
>                  from
/home/pcchou/project/gci/amarok/src/moc_PlaylistProviderExporter.cpp:9,
>                  from
/home/pcchou/project/gci/amarok/src/amaroklib_automoc.cpp:4:
> /usr/include/qt4/QtCore/qmetatype.h:324:7: error: forward declaration of
‘class QIcon’
>  class QIcon;
>        ^
> src/CMakeFiles/amaroklib.dir/build.make:294: recipe for target
'src/CMakeFiles/amaroklib.dir/amaroklib_automoc.o' failed
> make[2]: *** [src/CMakeFiles/amaroklib.dir/amaroklib_automoc.o] Error 1
> CMakeFiles/Makefile2:1256: recipe for target
'src/CMakeFiles/amaroklib.dir/all' failed
> make[1]: *** [src/CMakeFiles/amaroklib.dir/all] Error 2
> Makefile:113: recipe for target 'all' failed
> make: *** [all] Error 2
>
> The only differences I can note is that the student uses Kubuntu in a VM,
mine is a direct installation, and I use clang. Kevin gave some possible
errors on IRC:

Even I got the same error despite of the fact that am using direct
installation of Kubuntu 14.10
>
> [15:52] <kfunk> could be that sth in the include chain includes QIcon for
you and the CI, and thus doesn't fail.
> [15:53] <kfunk> could even be automoc's fault, because of a different
order of moc call on the files
> [15:53] <kfunk> => not easy to say what's causing this
>
> Would be nice if somebody could check that. Thanks in advance!
>
> Regards, Myriam
> --
> Proud member of the Amarok and KDE Community
> Protect your freedom and join the Fellowship of FSFE:
> http://www.fsfe.org
> Please don't send me proprietary file formats,
> use ISO standard ODF instead (ISO/IEC 26300)
>
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>
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