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Bug 778392 - dev-qt/qtwidgets[gtk] ignores -display command line option
Summary: dev-qt/qtwidgets[gtk] ignores -display command line option
Status: UNCONFIRMED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Qt Bug Alias
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-03-26 11:50 UTC by Felix J. Ogris
Modified: 2021-09-14 20:03 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Felix J. Ogris 2021-03-26 11:50:14 UTC
If qtwidgets are build with USE=gtk, then every Qt application seems to ignore the -display command line option, e.g.:

$ DISPLAY="" qtpass -display :0.0

(qtpass:11039): Gtk-WARNING **: 12:38:21.221: cannot open display: 
$ DISPLAY="" qtpass -display :0

(qtpass:11042): Gtk-WARNING **: 12:38:22.883: cannot open display: 
$ DISPLAY="foobar" qtpass -display :0

(qtpass:11084): Gtk-WARNING **: 12:39:48.488: cannot open display: foobar
$ DISPLAY="" pinentry-qt5 --display :0

(pinentry-qt5:11199): Gtk-WARNING **: 12:45:27.577: cannot open display: 
$ DISPLAY="foobaz" pinentry-qt5 --display :0.0

(pinentry-qt5:11201): Gtk-WARNING **: 12:45:33.440: cannot open display: foobaz


$ equery u qtwidgets
[ Legend : U - final flag setting for installation]
[        : I - package is installed with flag     ]
[ Colors : set, unset                             ]
 * Found these USE flags for dev-qt/qtwidgets-5.15.2:
 U I
 + + X          : Add support for X11
 - - debug      : Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
 - - gles2-only : Use GLES 2.0 or later instead of full OpenGL
 + + gtk        : Build the GTK platform theme plugin 
 + + png        : Add support for libpng (PNG images)
 - - test       : Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)


Reproducible: Always

Steps to Reproduce:
1. emerge dev-qt/qtwidgets with USE=gtk
2. unset DISPLAY
3. launch any Qt application and pass a valid -display :0.0 or -display :0 commandline option
Actual Results:  
applications exit with an error message:
Gtk-WARNING **: 12:46:55.930: cannot open display:

Expected Results:  
applications show their main window on the specified display
Comment 1 Davide Pesavento gentoo-dev 2021-09-13 18:41:07 UTC
are you saying that just by toggling the gtk USE flag the behavior wrt -display handling changes?

what's $XDG_SESSION_TYPE set to?
Comment 2 Felix J. Ogris 2021-09-14 20:03:36 UTC
Yes, but just if -display is set to 0:

$ DISPLAY="foobar" qtpass -display :0

(qtpass:24807): Gtk-WARNING **: 21:53:51.655: cannot open display: foobar


Compare this to:

$ DISPLAY="foobar" qtpass -display :1
qt.qpa.xcb: could not connect to display :1
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: minimal, offscreen, xcb.


$ echo $XDG_SESSION_TYPE
x11


$ equery u qtwidgets
[ Legend : U - final flag setting for installation]
[        : I - package is installed with flag     ]
[ Colors : set, unset                             ]
 * Found these USE flags for dev-qt/qtwidgets-5.15.2-r10:
 U I
 + + X          : Add support for X11
 - - debug      : Enable extra debug codepaths, like asserts and extra output.
                  If you want to get meaningful backtraces see https://wiki.gen
                  too.org/wiki/Project:Quality_Assurance/Backtraces
 - - gles2-only : Use GLES 2.0 or later instead of full OpenGL
 + + gtk        : Build the GTK platform theme plugin 
 + + png        : Add support for libpng (PNG images)
 - - test       : Enable dependencies and/or preparations necessary to run
                  tests (usually controlled by FEATURES=test but can be toggled
                  independently)