Bug 213411 - x11-libs/qt-4.3.x has aliasing problems
Bug#: 213411 Product:  Gentoo Linux Version: 2007.0 Platform: All
OS/Version: Linux Status: RESOLVED Severity: normal Priority: P2
Resolution: FIXED Assigned To: qt@gentoo.org Reported By: h.mth@web.de
Component: Ebuilds
URL:  http://cvs.fedoraproject.org/viewcvs/*checkout*/devel/qt/qt-x11-opensource-src-4.3.4-aliasing.patch
Summary: x11-libs/qt-4.3.x has aliasing problems
Keywords:  
Status Whiteboard: 
Opened: 2008-03-14 17:06 0000
Description:   Opened: 2008-03-14 17:06 0000 
The Qt library version 4.3.x has problems with aliasing.
These should be fixed in 4.4.

Some gcc versions with optimization '-O2' or '-fstrict-aliasing' compile Qt but
throw segmentation faults at runtime.

See my mailing list thread at Qt-interest:
http://lists.trolltech.com/qt-interest/2008-03/thread00368-0.html
(Message 6 and onwards get interesting.)

One issue is fixed with the patch from fedora on URL. But on f.g.o and b.g.o I
see Qt segfaulting other way, the QApplication constructor.

I recommend to add 'append-flags -fno-strict-aliasing' in src_compile before
configure is called.

References:
https://forums.gentoo.org/viewtopic-t-668006.html
https://forums.gentoo.org/viewtopic-t-492597.html
https://forums.gentoo.org/viewtopic-t-674330.html
https://bugs.gentoo.org/192954

------- Comment #1 From Ingmar Vanhassel (RETIRED) 2008-03-19 04:30:58 0000 ------- 
Fixed in qt-4.3.4-r1, thanks for letting us know. :)

------- Comment #2 From Jakub Moc (RETIRED) 2008-03-22 06:47:32 0000 ------- 
*** Bug 214223 has been marked as a duplicate of this bug. ***

------- Comment #3 From Jakub Moc (RETIRED) 2008-03-22 06:58:32 0000 ------- 
Reopen wrt Bug 214218, this thing looks more borked than this...

------- Comment #4 From Mark Loeser 2008-05-03 19:01:55 0000 ------- 
I don't see a porting problem here :)

------- Comment #5 From Ben de Groot 2009-01-03 01:30:39 0000 ------- 
*** Bug 241828 has been marked as a duplicate of this bug. ***