pykde fails to compile on ARM

[Jonathan Riddell]

PyKDE fails to compile on ARM with version 4.6.0

/usr/bin/sip -t ALL -t WS_X11 -t Qt_4_7_1 -x VendorID -x PyQt_NoPrintRangeBug -x PyQt_qreal_double -g -j 8 -c /build/buildd/kdebindings-4.6.0/obj-arm-linux-gnueabi/python/pykde4-2.7/sip/akonadi -I /usr/share/sip/PyQt4 -I /build/buildd/kdebindings-4.6.0/python/pykde4/sip /build/buildd/kdebindings-4.6.0/python/pykde4/sip/akonadi/akonadimod.sip
sip: KPlotAxis::majorTickMarks() unsupported function return type - provide %MethodCode and a C++ signature

 -x PyQt_qreal_double should stop this problem from occuring but it doesn't seem to work, it's still correctly defined in qglobal.sip though

[Michael Casadevall (mcasadevall)]

Issue doesn't appear to be qreal related at first glance as the breaking function properly defines a double as does the kplotaxis.h header. Continuing to investigate.

[Jani Monoses (jani)]

In the python/pykde4 dir running

sip -t ALL -t WS_X11 -t Qt_4_7_1 -x VendorID -x PyQt_NoPrintRangeBug -x PyQt_qreal_double -g -c someoutputdir -I /usr/share/sip/PyQt4 -I sip sip/kdeui/kdeuimod.sip

fails as in the FTBFS log.

After dropping the -x PyQt_qreal_double it works.

Similarly it works if the above is not dropped but the signature of the offending functions is changed to return QList<float>
or QList<qreal> in
kplotaxis.sip whre the originals read

    QList<double> majorTickMarks () const;
    QList<double> minorTickMarks () const;

By works I mean the command does not error, whether the generated bindings are correct I don't know.

One of the first mentions of MethodCode missing errors after googling shows it was related to templated return type, maybe that case needs more testing?

[Felix Geyer (debfx)]

qgis fails to build with the same error:
> sip: QgsComposerScaleBar::segmentPositions() unsupported function argument type - provide %MethodCode and a valid C++ signature

[Jani Monoses (jani)]

That has an argument of QList<QPair<double, double> >
So a combination of QList templates and doubles is common for these failures.

[Jani Monoses (jani)]

There was a regression in python-qt4-dev that caused the problem. An Ubuntu qreal_float patch was dropped which lead to some types of Method signatures not to be recognized. QList<qreal> was defined so on most platforms QList<double> worked, but not on ARM.

[Jani Monoses (jani)]

Past the previous failure caused by a regressed python-qt4 but now failing in another place much later.
http://launchpadlibrarian.net/65100586/buildlog_ubuntu-natty-armel.kdebindings_4:4.6.0-0ubuntu1_FAILEDTOBUILD.txt.gz

[Jonathan Riddell (jr)]

This is a general problem not specific to ARM so I'll close this bug. Thanks for the help Jani.