Migrating Qt 5.5.1 -> Qt 5.6.0 .. how to avoid multiple versions?
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I had previously installed and tested Qt 5.5.1 on Ubuntu 14.04 (32 bit).
from the PPA repository here ...
https://launchpad.net/~beineri/+archive/ubuntu/opt-qt551-trusty
into /opt/qt55I then installed Qt 5.6.0 from same PPA repository ...
https://launchpad.net/~beineri/+archive/ubuntu/opt-qt56-trusty
into /opt/qt56
alongside /opt/qt55Now when I launch Qt 5.6 Creator and view > Options > Build & Run > Qt Versions
I see ...
Auto-detected
Qt 5.5.1 in PATH (qt55) /opt/qt55/bin/qmakeManual
Qt 5.6.0 (qt56) /opt/qt56/bin/qmake...
When in Qt Creator 3.6.1 (based on Qt 5.6.0) and starting a new simple widget project
then Ctrl+K .. the Custom Commands pop-up list refers to /opt/qt55 and not as I expect /opt/qt56
...
Running qmake --version
returns ..
QMake version 3.0
Using Qt version 5.6.0 in /opt/qt56/lib
...Because of this confusion between qt55 and qt56 installations I would prefer to uninstall/purge Qt 5.5.1.
But when I tried that (by admittedly crude method of temporary disabling installation folder /opt/qt55 by renaming to /opt/__qt55 to break paths) I found that the Auto-detected entry in Qt Creator then showed an error under Auto-detected.
I had to re-enable /opt/qt55 to remove the error in Qt Creator.
Surely the Auto-detected and Manual variables should be identical?
My question is .. what is best practice to safely purge Qt 5.5.1 from /opt/qt55 to leave only Qt 5.6.0 installed in /opt/qt56? And for the Auto-detect to find only 5.6.0?
...
There is a related thread found here ...
https://forum.qt.io/topic/65394/how-to-completely-un-install-qt
but I prefer not to have multiple versions of Qt. -
Hi @eureka, does this help? http://askubuntu.com/questions/307/how-can-ppas-be-removed
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@JKSH
Thanks for the link.I have Y PPA Manager already installed so I can use that tool to remove/purge both PPA installations to allow me to start with a clean sheet to reinstall Qt 5.6.0 (32 bit Linux) from Qt downloads site.
However I cannot find an installer for 32bit Qt 5.6.0 .. http://www.qt.io/download-open-source/
There are offline installers but only for Linux 64 bit.
I don't want to go through a build from source.So I have to return to the option of using PPA pre-built versions.
I'll try purging Qt 5.5.1.Why doesn't Qt place a Linux 32bit offline installer on the Qt downloads page (as you do for Windows)?
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@eureka said:
Why doesn't Qt place a Linux 32bit offline installer on the Qt downloads page (as you do for Windows)?
It's a decision made by the Qt release team: http://comments.gmane.org/gmane.comp.lib.qt.devel/22021 Qt 5.5.1 is the last version of Qt that will receive a pre-built 32-bit package on Linux. I'm guessing it's because the market share of 32-bit desktop Linux is diminishing.
Each pre-built package costs time and energy to test, so not all possibilities can be supported, unfortunately. For example, MinGW users on Windows are stuck with 32-bit installers only; there's no 64-bit MinGW installer.
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@JKSH said:
I'm guessing it's because the market share of 32-bit desktop Linux is diminishing.
Unfortunately I'll have to live with my ancient laptop (x86) for some time yet, so I returned to the PPA pre-built 32bit route.
After uninstalling Qt 5.5.1 and Qt 5.6.0 and then reinstalling only Qt 5.6.0 I was back where I started with references to /opt/qt55 still seen (as I wrote above in my first post).
I realised that I had to disable ~/.config/QtProject folder which held historical data referring to /opt/qt55. A fresh Qt folder was auto created in ~/.config when I loaded Qt 5.6 Creator.
I kept a backup of the old ~/.config/QtProject folder in case I need to refer back to contents.
So on now to trying Qt 5.6.0 app development.
Thanks.
