#44193: qt: allow side by side installation of qt4-mac and qt5-mac -------------------------------+------------------------ Reporter: mojca@… | Owner: mcalhoun@… Type: enhancement | Status: new Priority: Normal | Milestone: Component: ports | Version: Resolution: | Keywords: Port: qt4-mac, qt5-mac | -------------------------------+------------------------ Comment (by michaelld@…): Replying to [comment:54 rjvbertin@…]:

Replying to [comment:53 michaelld@…]:

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Well, this is the way the Qt folks do it in Qt5; I just back-ported it to Qt4. I don't care if it is more or less efficient. If it's good enough for Qt5 then it's good enough for Qt4 (IMHO). You may be right, but Qt5 has lots of other changes under the hood which may make this particular code path much less of a bottleneck that it *maybe* is in Qt4

Also true. Bottom line is that this patch allows Qt4 to build on 10.11 without resorting to using the 10.10 SDK; it seems to work correctly too. So, no matter the performance, this is a win at least for 10.11 users (who will be numerous shortly, since Apple just gives away the OS). I also doubt that the performance is very different between the original and this version, as the primary change is in "QCoreGraphicsPaintEngine::clearColorSpace", which, really, isn't likely to be used very often (do a grep though the qt4 source & you'll find a few references to this; grep those & you find almost no references). This method was removed in Qt5 sometime; apparently it really isn't used much if at all. Thus, I don't worry about performance, either. -- Ticket URL: <https://trac.macports.org/ticket/44193#comment:55> MacPorts <https://www.macports.org/> Ports system for OS X