[Interest] porting to Qt 5.4 - MOC very slow on Windows

Keith Gardner kreios4004 at gmail.com
Thu Jan 15 15:16:37 CET 2015

On Thu Jan 15 2015 at 12:33:59 AM Hamish Moffatt <hamish at risingsoftware.com>

> I'm trying to port our app from Qt 4.8 to 5.4. Currently working in MSVC
> 2013, and using the pre-built Qt binaries for that environment.
> We have about 440 files being MOCed during build. On 5.4, each file is
> taking 2-3 seconds meaning the overall build is significantly longer
> than in 4.8.
> I found a reference to a similar problem here -
> http://qt-project.org/forums/viewthread/47901 - which was due to using
> MOC on a network drive. In my case everything is on local SSD.
> Any suggestions?
> Do you have the /MP flag set for your project?  Even though MOC takes
longer, this will at least allow you to run one instance of MOC for every
core on your system in addition to reducing build times in general.
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