On Wednesday 10 December 2014 20:38:20 René J.V. Bertin wrote: > >Set the flag. I'm not sure if you'll have problems with QtXmlPatterns, but > >I don't think you will. > > That's what I saw after reading up a bit more on the topic. But if > QtXmlPatterns doesn't build without them, I'm stuck with -fexceptions as > KDE uses QtXmlPatterns ...
Try and see. I think xmlpatterns.pro turns it back on, but I could be wrong. You'll see in the output of configure whether it got enabled or not. > BTW, you didn't confirm if -no-exceptions does or does not put a > -fno-exceptions in the mkspecs ? It doesn't add to the mkspec, but it does pass -fno-exceptions in the Qt build. The difference is whether it affects other applications built with qmake: modifying the mkspec does, the configure option doesn't. > >Yes. Note we're talking about memory usage, not about code execution > >performance. The exceptional code paths and the exception tables need to be > >loaded in memory, even if you never use them. And since Qt does not ever > >use > I understood that, but loading into memory is not an instantaneous > operation, so if the overhead is large enough to be worth mentioning, the > load time overhead must be measurable too. You have to measure. The exception tables themselves mustn't be larger than a few pages. The big difference is the exceptional code paths. I don't know how big the size difference is. In any case, I'm more concerned about L1 cache misses than the actual size. > Fortunately, when comparing the memory footprints between Qt/KDE(4) and Mac > native applications, the balance is usually very much in favour of the > former. > > >Qt 5 made the option of compiling all modules except for QtCore and > >QtXmlPatterns without exceptions. > > Why make it an option, if they're not used internally? It's not an option. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest