On 08/01/2013 11:49 PM, Orion Poplawski wrote:
http://doc.qt.digia.com/4.6/qtglobal.html#qreal-typedef typedef qreal Typedef for double on all platforms except for those using CPUs with ARM architectures. On ARM-based platforms, qreal is a typedef for float for performance reasons. This still seems to be the case for 4.8 as well. This lead to the following compile error on arm in kst: /builddir/build/BUILD/kst-2.0.7/src/libkstapp/plotrenderitem.cpp:561:33: error: no matching function for call to 'qMin(double&, qreal)' y = qMin(y, plotItem()->yMax()); ^ If there is scientific type codes using qreal this might lead to some precision issues as well.
Yes, we've had to patch quite a few packages to fix/workaround qreal!=double assumptions in code.
Is double really that much slower on arm?
Good question for https://lists.fedoraproject.org/mailman/listinfo/arm (but, I assume the qt docs aren't lying and the answer is yes) -- rex _______________________________________________ kde mailing list kde@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/kde New to KDE4? - get help from http://userbase.kde.org
