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Qt 5.12 and Sailfish OS 3

asked 2018-11-20 04:44:57 +0200

JSEHV gravatar image

updated 2019-02-07 13:51:50 +0200

Will the new released Sailish OS 3 get an update of Qt to 5.12? As reported eg on Phoronix, there is a big performance win compared to previous versions. Plus a more current/uptodate webengine is integrated in this release (Chromium 69 vs 56 in Qt 5.9). On top of this it is released as an LTS (long term support) release.


The JavaScript speed-ups for Qt compared to older Qt5 releases is quite staggering while the overall performance compared to Qt 5.9 LTS is about 21%.

Link to the article on Phoronix

Update 07-02-2019:

As discussed in the last Sailfish OS Open Source meeting:

We (Jolla) are looking reasonably into the summer or even 2nd half of 2019 for the Qt 5.9 roll-out.

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QT 5.12 LTS has now been officially released:

pasikarkkainen ( 2018-12-07 11:31:28 +0200 )edit

In my view it is still better for Jolla to move to 5.12, as 5.9 is already in the "strict" phase, so it is not receiving all bug fixes anymore, only critical ones. Hope they will keep developers on it after the implementation of 5.9 in Sailfish 3.

For those who are interested and like to read on the improvements, all info can be found on the QT blog: QT 5.12.1 Released

Quote from Tuukka:

Qt 5.12 LTS will receive multiple patch releases throughout the coming ~3 years and we recommend all active developed projects to migrate to Qt 5.12 LTS. Qt 5.9 LTS is currently in ‘Strict’ phase and receives only the selected important bug and security fixes, while Qt 5.12 LTS is currently receiving all the bug fixes. With Qt 5.6 Support ending in March 2019 all active projects still using Qt 5.6 LTS should now migrate to a later version of Qt.
JSEHV ( 2019-02-04 08:52:43 +0200 )edit

4 Answers

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answered 2018-12-07 16:25:53 +0200

paolomi gravatar image

Qt 5.12 LTS is out and "We have had a strong focus on quality and fixed more than 2000 bugs since the last Qt LTS version, Qt 5.9.7 – make that over 5000 bugfixes since Qt 5.6.3. "


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Jolla should take some time and jump straight to the qt 5.12 lts. Better to wait more than get older gt 5.9 with "no time".

Jk ( 2018-12-07 19:48:38 +0200 )edit

Note, however, that there were regressions as well so Jolla will have to do lots of testing before switching to 5.12.

Aldrog ( 2018-12-07 22:56:17 +0200 )edit

answered 2018-11-20 10:28:18 +0200

Giacomo Di Giacomo gravatar image

Qt 5.12 final has not yet been released. You cannot use a less than ultrastable version in SFOS. If there is a malfunction, the whole system fails. This is not a PC where you can uninstall it and downgrade to the earlier version. The planned upgrade is to Qt 5.9.

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I could wait until spring, but updating to 5.9 which reaches end of support soon doesn't sound like a good plan to me.

rweickelt ( 2018-11-20 11:26:39 +0200 )edit

5.9 LTS would still be a step in the right direction, porting a major new Qt build over isn't exactly easy.

Allstar12345 ( 2018-11-20 11:48:30 +0200 )edit

Agree that it's a right step. I was just hoping for a leap ahead.

rweickelt ( 2018-11-20 17:04:15 +0200 )edit

To be honest it would be better for SFOS in to get 5.9 as soon as possible, the jump in performance to 5.9 could really let Jolla show SFOS off, at the moment it seems a bit slow opening Apps ect looking at videos.

Allstar12345 ( 2018-11-20 18:33:55 +0200 )edit

Very true.

rweickelt ( 2018-11-20 19:22:10 +0200 )edit

answered 2018-11-20 06:43:09 +0200

depscribe gravatar image

Best can be told, it's up in the air but not promising. You can dig the latest, if you want, from the log of last week's meeting, here:

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answered 2018-11-20 08:37:31 +0200

Nova gravatar image

updated 2019-01-03 10:41:22 +0200

Don't quote me, but a Qt upgrade was mentioned for December 2018... I can't remember where I read/heard it though. Edit: I guess I remembered incorrectly.

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Just because there wasn't a december release with a Qt upgrade doesn't mean that there wasn't any talk about it. I remember a similar thing as well (Qt 5.9 iirc) and hopefully some new Qt version will follow in a soon to come update...

laubblaeser ( 2019-01-03 19:03:45 +0200 )edit

Just seen from the open meeting that 5.9 is scheduled for second half of 2019, seems to be licensing issues as well as porting

Allstar12345 ( 2019-02-07 20:39:43 +0200 )edit
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Asked: 2018-11-20 04:44:57 +0200

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Last updated: Feb 07