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List:       kde-devel
Subject:    Re: problem building kdesupport/soprano against Qt4.5
From:       Brad Hards <bradh () frogmouth ! net>
Date:       2008-08-23 4:52:31
Message-ID: 200808231452.32419.bradh () frogmouth ! net
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On Friday 22 August 2008 08:46:25 pm Brad Hards wrote:
> On Friday 22 August 2008 04:44:23 pm Thiago Macieira wrote:
> > Yes. We've seen that problem. It happens because:
> > 
> > * Soprano uses a namespace
> > * Soprano defined qHash(Soprano::Node) before qhash.h was defined
> > * qvariant.h has changed in 4.5, including qhash.h now
> > 
> > That means the definition for QHash jumped above the definition of the
> > qHash function. You have to put the function inside the Soprano namespace
> > for this to work.
> 
> OK, that works for me.
Actually, it only worked for kdesupport/soprano.

Now I'm in kdelibs/nepomuk:
[ 88%] Building CXX object nepomuk/core/CMakeFiles/nepomuk.dir/resourcefiltermodel.o
/opt/qt45/include/QtCore/qhash.h: In member function ‘typename QHash<Key, \
T>::Node** QHash<Key, T>::findNode(const Key&, uint*) const [with Key = \
Soprano::Node, T =  QHashDummyValue]':
/opt/qt45/include/QtCore/qhash.h:741:   instantiated from ‘typename QHash<Key, \
T>::iterator QHash<Key, T>::insert(const Key&, const T&) [with Key = Soprano::Node, T \
=  QHashDummyValue]'
/opt/qt45/include/QtCore/qset.h:176:   instantiated from ‘QSet<T>::const_iterator \
                QSet<T>::insert(const T&) [with T = Soprano::Node]'
/opt/qt45/include/QtCore/qset.h:297:   instantiated from ‘QSet<T> QList<T>::toSet() \
                const [with T = Soprano::Node]'
/home/bradh/devel/kde-src/kdelibs/nepomuk/core/resourcefiltermodel.cpp:100:   \
                instantiated from here
/opt/qt45/include/QtCore/qhash.h:860: error: no matching function for call to \
                ‘qHash(const Soprano::Node&)'
/opt/qt45/include/QtCore/qhash.h:65: note: candidates are: uint qHash(char)
/opt/qt45/include/QtCore/qhash.h:66: note:                 uint qHash(uchar)
/opt/qt45/include/QtCore/qhash.h:67: note:                 uint qHash(signed char)
/opt/qt45/include/QtCore/qhash.h:68: note:                 uint qHash(ushort)
/opt/qt45/include/QtCore/qhash.h:69: note:                 uint qHash(short int)
/opt/qt45/include/QtCore/qhash.h:70: note:                 uint qHash(uint)
/opt/qt45/include/QtCore/qhash.h:71: note:                 uint qHash(int)
/opt/qt45/include/QtCore/qhash.h:72: note:                 uint qHash(ulong)
/opt/qt45/include/QtCore/qhash.h:80: note:                 uint qHash(long int)
/opt/qt45/include/QtCore/qhash.h:81: note:                 uint qHash(quint64)
/opt/qt45/include/QtCore/qhash.h:89: note:                 uint qHash(qint64)
/opt/qt45/include/QtCore/qhash.h:90: note:                 uint qHash(QChar)
/opt/qt45/include/QtCore/qhash.h:91: note:                 uint qHash(const \
                QByteArray&)
/opt/qt45/include/QtCore/qhash.h:92: note:                 uint qHash(const QString&)
/opt/qt45/include/QtCore/qhash.h:93: note:                 uint qHash(const \
                QStringRef&)
/opt/qt45/include/QtCore/qhash.h:94: note:                 uint qHash(const \
QBitArray&) make[2]: *** [nepomuk/core/CMakeFiles/nepomuk.dir/resourcefiltermodel.o] \
Error 1 make[1]: *** [nepomuk/core/CMakeFiles/nepomuk.dir/all] Error 2
make: *** [all] Error 2
[1]+  Done                    xemacs \
/home/bradh/devel/kde-src/kdelibs/nepomuk/core/resourcefiltermodel.cpp  (wd: \
~/devel/kde-build/kdelibs-build) (wd now: ~/devel/kde-build/kdelibs-build/nepomuk

I did the same kind of namespace wrapping:

===================================================================
--- nepomuk/core/resourcefiltermodel.cpp        (revision 850712)
+++ nepomuk/core/resourcefiltermodel.cpp        (working copy)
@@ -41,13 +41,13 @@

 using namespace Soprano;

-
+namespace Soprano {
 uint qHash( const Soprano::Node& node )
 {
     return qHash( node.toString() );
 }
+}

-
 class Nepomuk::ResourceFilterModel::Private
 {
 public:


and it now compiles, but won't link:

Linking CXX shared library ../../lib/libnepomuk.so
CMakeFiles/nepomuk.dir/resourcefiltermodel.o: In function `QHash<QUrl, \
QHashDummyValue>::findNode(QUrl const&, unsigned int*) const': \
resourcefiltermodel.cpp:(.text._ZNK5QHashI4QUrl15QHashDummyValueE8findNodeERKS0_Pj[QHash<QUrl, \
QHashDummyValue>::findNode(QUrl const&, unsigned int*) const]+0x2a): undefined  \
                reference to `qHash(Soprano::Node const&)'
collect2: ld returned 1 exit status

Brad
 
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