Bug 542698

Summary:	dev-qt/designer-5.4.1 crashes with dev-qt/qtquick1-5.4.0[designer]
Product:	Gentoo Linux	Reporter:	Maik Nijhuis <manyac>
Component:	[OLD] Development	Assignee:	Qt Bug Alias <qt>
Status:	RESOLVED FIXED
Severity:	normal	CC:	Yanestra
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	543326

Description Maik Nijhuis 2015-03-09 13:55:02 UTC

When running 'designer', I got this message: "Cannot mix incompatible Qt library (version 0x50400) with this library (version 0x50401)"

The core dump quickly revealed that /usr/lib64/libQt5Declarative.so.5 caused the problem. This file belongs to qtquick1-5.4.0, which was still on my system even though I upgraded other qt packages to 5.4.1. After upgrading qtquick1 to 5.4.1 the problem disappeared. After removing qtquick1 I could still run designer.

Qt Designer apparantly automatically loads /usr/lib64/libQt5Declarative.so.5 (via the plugin /usr/lib64/qt5/plugins/designer/libqdeclarativeview.so) if it detects its presence.

The ebuild for dev-qt/designer should thus have a dependency on dev-qt/qtquick1: If qtquick1 is installed, it should have the same version as designer. Could you update the ebuild?

Reproducible: Always

Comment 1 Michael Palimaka (kensington) gentoo-dev

2015-03-16 16:04:22 UTC

Thanks, pushed a commit to the overlay for review.

https://gitweb.gentoo.org/proj/qt.git/commit/?id=c23384467ccb1541f1bb4e7f333355bb98ea62d6

Comment 2 Davide Pesavento (RETIRED) gentoo-dev

2015-03-16 17:42:10 UTC

Maybe this would be better solved using subslots? (see also bug 523616)

Comment 3 Michael Palimaka (kensington) gentoo-dev

2015-03-17 10:41:09 UTC

(In reply to Davide Pesavento from comment #2)
> Maybe this would be better solved using subslots? (see also bug 523616)

Is the error because the plugin was built against an older version, or because it is an older version? If the latter, subslots won't force an upgrade.

Comment 4 Davide Pesavento (RETIRED) gentoo-dev

2015-03-17 12:55:35 UTC

Good question. But I agree that it's safer to use the ~ dependency, so ACK from me. Maybe add a comment in the ebuild with a reference to this bug.

Comment 5 Michael Palimaka (kensington) gentoo-dev

2015-03-17 14:51:13 UTC

Thanks, fixed in CVS.

+  17 Mar 2015; Michael Palimaka <kensington@gentoo.org>
+  +qtquick1-5.4.1-r1.ebuild:
+  Pin dev-qt/designer dependency avoid a crash wrt bug #542698.