Bug 544666

Summary:	=dev-qt/qtcore-4.8.5 collisions on downgrade from 4.8.6
Product:	Gentoo Linux	Reporter:	Rick Farina (Zero_Chaos) <zerochaos>
Component:	[OLD] Development	Assignee:	Qt Bug Alias <qt>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Rick Farina (Zero_Chaos) gentoo-dev

2015-03-27 15:55:04 UTC

It looks like qtcore-4.8.6 split out dev-qt/qttranslations which collides with qtcore in version 4.8.5.

Can we please add a blocker to ease downgrade?  I know it's not typical, but it shouldn't hurt anything.

DEPEND="!dev-qt/qttranslations:4" seems appropriate if I had to guess....

You may ignore this, but I hit collision while testing the -Os bug in x86 so I figured it was worth reporting.

Comment 1 Ben de Groot (RETIRED) gentoo-dev

2015-03-28 01:03:38 UTC

qt4-build.eclass has this gem:

ewarn "Downgrading Qt is completely unsupported and can break your system!"

So if you attempt that, you're on your own anyway. That said, I'm not against adding the blocker for completeness.

Comment 2 Davide Pesavento (RETIRED) gentoo-dev

2015-03-29 03:26:26 UTC

(In reply to Ben de Groot from comment #1)
> 
> ewarn "Downgrading Qt is completely unsupported and can break your system!"

That's mostly for historical reasons, and mainly refers to potential breakages (missing symbols) at the ABI level when downgrading, i.e. something outside our control.

The file collision is a packaging bug instead, and must be fixed.

Comment 3 Davide Pesavento (RETIRED) gentoo-dev

2015-03-29 03:43:28 UTC

  29 Mar 2015; Davide Pesavento <pesa@gentoo.org> qtcore-4.8.5-r2.ebuild:
  Add blocker to prevent file collision on downgrade, thanks to Zero_Chaos in
  bug #544666.