Qwt build error with Qt 4.6.0-tp1

[alex-krutikov]

Hi,

I tryed to build Qwt from svn with Qt 4.6.0-tp1 (MinGW 3.4.5). The following build error happened:

../../include/QtCore/../../src/corelib/tools/qhash.h: In member function `typename QHash<K, V>::Node** QHash<K, V>::findNode(const Key&, uint*) const [with Key = qreal, T = QHashDummyValue]':
../../include/QtCore/../../src/corelib/tools/qhash.h:742:   instantiated from `typename QHash<K, V>::iterator QHash<K, V>::insert(const Key&, const T&) [with Key = qreal, T = QHashDummyValue]'
../../include/QtCore/../../src/corelib/tools/qset.h:175:   instantiated from `QSet<V>::const_iterator QSet<V>::insert(const T&) [with T = qreal]'
../../include/QtCore/../../src/corelib/tools/qset.h:309:   instantiated from `QSet<T> QList<T>::toSet() const [with T = qreal]'
qwt_valuelist.h:48:   instantiated from here
../../include/QtCore/../../src/corelib/tools/qhash.h:865: error: call of overloaded `qHash(const double&)' is ambiguous
../../include/QtCore/../../src/corelib/tools/qhash.h:63: note: candidates are: uint qHash(char)
../../include/QtCore/../../src/corelib/tools/qhash.h:64: note:                 uint qHash(uchar)
../../include/QtCore/../../src/corelib/tools/qhash.h:65: note:                 uint qHash(signed char)
../../include/QtCore/../../src/corelib/tools/qhash.h:66: note:                 uint qHash(ushort)
../../include/QtCore/../../src/corelib/tools/qhash.h:67: note:                 uint qHash(short int)
../../include/QtCore/../../src/corelib/tools/qhash.h:68: note:                 uint qHash(uint)
../../include/QtCore/../../src/corelib/tools/qhash.h:69: note:                 uint qHash(int)
../../include/QtCore/../../src/corelib/tools/qhash.h:71: note:                 uint qHash(ulong)
../../include/QtCore/../../src/corelib/tools/qhash.h:78: note:                 uint qHash(long int)
../../include/QtCore/../../src/corelib/tools/qhash.h:80: note:                 uint qHash(quint64)
../../include/QtCore/../../src/corelib/tools/qhash.h:87: note:                 uint qHash(qint64)
../../include/QtCore/../../src/corelib/tools/qhash.h:88: note:                 uint qHash(QChar)

../../include/QtCore/../../src/corelib/tools/qhash.h: In member function `typename QHash<K, V>::Node** QHash<K, V>::findNode(const Key&, uint*) const [with Key = qreal, T = QHashDummyValue]':
../../include/QtCore/../../src/corelib/tools/qhash.h:742:   instantiated from `typename QHash<K, V>::iterator QHash<K, V>::insert(const Key&, const T&) [with Key = qreal, T = QHashDummyValue]'
../../include/QtCore/../../src/corelib/tools/qset.h:175:   instantiated from `QSet<V>::const_iterator QSet<V>::insert(const T&) [with T = qreal]'
../../include/QtCore/../../src/corelib/tools/qset.h:309:   instantiated from `QSet<T> QList<T>::toSet() const [with T = qreal]'
qwt_valuelist.h:48:   instantiated from here
../../include/QtCore/../../src/corelib/tools/qhash.h:865: error: call of overloaded `qHash(const double&)' is ambiguous
../../include/QtCore/../../src/corelib/tools/qhash.h:63: note: candidates are: uint qHash(char)
../../include/QtCore/../../src/corelib/tools/qhash.h:64: note:                 uint qHash(uchar)
../../include/QtCore/../../src/corelib/tools/qhash.h:65: note:                 uint qHash(signed char)
../../include/QtCore/../../src/corelib/tools/qhash.h:66: note:                 uint qHash(ushort)
../../include/QtCore/../../src/corelib/tools/qhash.h:67: note:                 uint qHash(short int)
../../include/QtCore/../../src/corelib/tools/qhash.h:68: note:                 uint qHash(uint)
../../include/QtCore/../../src/corelib/tools/qhash.h:69: note:                 uint qHash(int)
../../include/QtCore/../../src/corelib/tools/qhash.h:71: note:                 uint qHash(ulong)
../../include/QtCore/../../src/corelib/tools/qhash.h:78: note:                 uint qHash(long int)
../../include/QtCore/../../src/corelib/tools/qhash.h:80: note:                 uint qHash(quint64)
../../include/QtCore/../../src/corelib/tools/qhash.h:87: note:                 uint qHash(qint64)
../../include/QtCore/../../src/corelib/tools/qhash.h:88: note:                 uint qHash(QChar)

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[Uwe]

This is a Qt problem, that is known from earlier Qt4 versions. Please report this to the Qt development and ask them to reintroduce qHash(double), what seems to be necessary (AFAIR) for type definitions, that have nothing to do with hashing.

Uwe

[hml]

I am having the same problem with Qt opensource 4.6.0 (vs2008) downloaded from qt website.

[navid]

hello,

I want only 2-D plotting, what can I do with this installation problem? Is it possible to I use only some source pages?

regards
navid

[hml]

If you check out the sources from the svn sourceforce repository as mentioned on the main page, it has the fix that will allow to build qwt with qt4.6.0 without problems.
The repository checkout has fixes for bugs that are in the compressed archives.

[navid]

updated to reversion 625 but the problem exist.

The repository checkout has fixes for bugs that are in the compressed archives.

by the way, what do you mean?

[Uwe]

Please read before posting: there are enough threads about the Qt 4.6 + qHash problem in this forum, f.e. http://www.qtcentre.org/forum/f-qwt-...tp1-24721.html

updated to reversion 625 ...

Revison 625 is in the development branch ( = trunk ), but you need the code from the 5.2 branch. The qHash problem is solved in both branches.

... but the problem exist.

No, the offending export declaration has been removed from the code. If you have problems compiling Qwt then it has to be a different problem.

Uwe