Denis, There's an additional way to mitigate this: 1/ requesting Qt devs to apply the patch fixing this issue ( http://code.qt.io/cgit/qt/qtbase.git/patch/src/corelib/tools/qlocale.h?id=726fed0d67013cbfac7921d3d4613ca83406fb0f ) onto Qt 5.6, which after all is a LTS version; 2/ requesting distributions - such as Ubuntu and Fedora - to apply the patch onto the packages maintained and offered through their repositories.
Regarding #2, I've filed such a request earlier today: https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1620173 It's a shame we can't override the QVariant conversion to QString with some code of our own to patch the issue on Qt5 < 5.7. Math On Mon, Sep 5, 2016 at 12:23 PM, Denis Rouzaud <[email protected]> wrote: > Hi Mathieu, > > For reference, here is the Qt issue > https://bugreports.qt.io/browse/QTBUG-47192 > > It's the conversion from QVariant to QString which is broken. > > There are several ways to deal with this: > * fix this for some versions of Qt (no idea how) > * require Qt 5.7+ > * ship like this with a warning notice > > The discussion already arised and the latter seems to be prefered: > https://lists.osgeo.org/pipermail/qgis-developer/2016-August/044127.html > > Denis > > > > On 09/05/2016 04:39 AM, Mathieu Pellerin wrote: > > Greetings, > > While testing QGIS compiled against Qt5 5.6.1 (the version that will be > offered in Ubuntu's next release in a month or so), I ran into a rounding > issue, whereas the round() expression engine function simply fails to round > values to the stated number of decimals. > > As seen in this screenshot[1], using this expression "round( 0.972743..., > 2 )" to round the double value to two decimals returns 0.96999999999997. > > Nyall says the issue has been fixed in Qt5 5.7. For Qt5 < 5.7, is there a > contingency plan for this problem? Could we get distributions to include a > fix in their 5.6.x packages (if that’s possible)? > > Math > > [1] http://i.imgur.com/7v2Z24Z.png > > > > _______________________________________________ > Qgis-developer mailing [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer > > >
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