[Interest] Application build times using Qt4 vs Qt5

[Koehne Kai]

> -----Original Message-----
> From: interest-bounces+kai.koehne=digia.com at qt-project.org
> [mailto:interest-bounces+kai.koehne=digia.com at qt-project.org] On Behalf
> Of Adam Light
> Sent: Tuesday, July 29, 2014 8:23 PM
> To: Interest at qt-project.org
> Subject: [Interest] Application build times using Qt4 vs Qt5
> 
> I've noticed that compiling my application takes considerably longer when
> compiling using Qt5 vs. Qt 4. This is true on Macintosh 10.9 and Windows 7.
> I'm comparing builds done using the same machine with the same application
> source code.
> 
> For example,
> Macintosh:
> Qt 4.8.6: Elapsed time: 06:20
> 
> Qt 5.4-dev: Elapsed time: 08:51.
> 
> 
> Windows:
> Qt 4.8.6: Elapsed time: 04:51.
> 
> Qt 5.4-dev: Elapsed time: 10:23.

For Mac, make sure that you call cache() in your top-level .pro file ( see e.g. http://stackoverflow.com/questions/18055726/warning-while-building-project-using-qt-5-1-on-osx )

No idea really about Windows, and I haven't noticed anything like this myself. You might consider doing a dry compilation run (jom /N /J 1) with both Qt 4 and Qt 5, and then compare the output.

Regards
Kai