qt tools freeze on startup

kshots

I can't start qt creator (version 13.0.2). I've noticed that I can start, but not open .ui files, using designer 6.7.2 (but have no problems with 5.15.14). This is a fairly recent problem...

I'm running gentoo linux with qt 6.7.2 and 5.15.14 both installed. My project is using 6.7.2, but given I can't use designer or creator, now that I'm making UI files I'm being forced to use designer 5, which is sub-optimal. I'd also like to use creator, as it's actually capable of peeking at Qt variable names while CLion is not currently working for that purpose.

Running qtcreator with QT_DEBUG_PLUGINS=1 gives many thousands of lines of output (which apparently cannot be redirected to a file as it is neither stdout nor stderr, so 2>&1 >/some/file does not work)... but here's the last bit if that helps anyone try to debug this mess:

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QMYSQL", "QMARIADB")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/sqldrivers" ...
qt.core.library: "/usr/lib64/qt6/plugins/sqldrivers/libqsqlite.so" loaded library
qt.core.plugin.factoryloader: checking directory path "/usr/lib64/qt6/plugins/wayland-decoration-client" ...
qt.core.plugin.factoryloader: looking at "/usr/lib64/qt6/plugins/wayland-decoration-client/libbradient.so"
qt.core.plugin.loader: Found metadata in lib /usr/lib64/qt6/plugins/wayland-decoration-client/libbradient.so, metadata=
{
    "IID": "org.qt-project.Qt.WaylandClient.QWaylandDecorationFactoryInterface.5.4",
    "MetaData": {
        "Keys": [
            "bradient"
        ]
    },
    "archlevel": 3,
    "className": "QWaylandBradientDecorationPlugin",
    "debug": false,
    "version": 395008
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("bradient")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/wayland-decoration-client" ...
qt.core.library: "/usr/lib64/qt6/plugins/wayland-decoration-client/libbradient.so" loaded library

Any hints on how to get a functional environment again?

ChrisW67

@kshots said in qt tools freeze on startup:

Running qtcreator with QT_DEBUG_PLUGINS=1 gives many thousands of lines of output (which apparently cannot be redirected to a file as it is neither stdout nor stderr, so 2>&1 >/some/file does not work)..

You have your redirections back-to-front. Reading left-to-right you need to send stdout somewhere and then redirect stderr to the same place:

chrisw@newton:/tmp$ QT_DEBUG_PLUGINS=1 ~/Qt/Tools/QtCreator/bin/qtcreator > debug.txt 2>&1
chrisw@newton:/tmp$ ls -l debug.txt 
-rw-rw-r-- 1 chrisw chrisw 251763 Jun 22 14:39 debug.txt

(Or just redirect stderr alone in this case)

Are you using a Wayland or X11 session in Gentoo?

JonB

@ChrisW67 said in qt tools freeze on startup:

Reading left-to-right you need to send stdout somewhere and then redirect stderr to the same place:

You learn something new every day! In all my years of using UNIX I thought 2>&1 >file would work, I thought it would connect #2 to "logical" #1 and then #1 to file, taking #2 with it....

@kshots

so 2>&1 >/some/file does not work

Assuming you are using bash (or csh), it's simpler to type and you don't have to worry about order if you use:

command >& file
command |& less

:)

kshots

@ChrisW67 said in qt tools freeze on startup:

@kshots said in qt tools freeze on startup:

Running qtcreator with QT_DEBUG_PLUGINS=1 gives many thousands of lines of output (which apparently cannot be redirected to a file as it is neither stdout nor stderr, so 2>&1 >/some/file does not work)..

You have your redirections back-to-front. Reading left-to-right you need to send stdout somewhere and then redirect stderr to the same place:
chrisw@newton:/tmp$ QT_DEBUG_PLUGINS=1 ~/Qt/Tools/QtCreator/bin/qtcreator > debug.txt 2>&1
chrisw@newton:/tmp$ ls -l debug.txt 
-rw-rw-r-- 1 chrisw chrisw 251763 Jun 22 14:39 debug.txt
(Or just redirect stderr alone in this case)

Are you using a Wayland or X11 session in Gentoo?

Huh - I always thought that was the order. Evidently not - thanks for the suggestion. Here's a pastebin of the full output.

I'm using Wayland under gentoo at the moment.

kshots

Update... an oddity here - I can start qt creator if I disconnect my external monitors.

Edit: ... and a few minutes later creator froze and won't start up again. <frustration>

ChrisW67

@kshots Does this delay behaviour persist if you use an X11 session?

cristian-adam

How does Qt Creator 13.0.2 from https://download.qt.io/official_releases/qtcreator/13.0/ work?