Bug 783481

Summary:	icu fails in rawhide with gcc 4.7.0 mass rebuild
Product:	[Fedora] Fedora	Reporter:	Peter Robinson <pbrobinson>
Component:	gcc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	denis.arnaud_fedora, erack, jakub
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	gcc-4.7.0-0.9.fc17	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-01-24 07:37:56 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Peter Robinson 2012-01-20 15:21:12 UTC

icu 4.8.1 previously built fine in rawhide in the mass rebuild it failed in the tests with quite a number of test failures.

Build is
http://koji.fedoraproject.org/koji/taskinfo?taskID=3717531

The previous build on December 13th built OK so its possibly a regression in gcc
http://koji.fedoraproject.org/koji/buildinfo?buildID=278730

I've tested the build up to and including gcc-4.7.0-0.8.fc17

Comment 1 Peter Robinson 2012-01-20 15:21:51 UTC

assigning to gcc as likely a gcc issue

Comment 2 Jakub Jelinek 2012-01-20 15:36:41 UTC

That needs analysis by the package maintainer first.  It might be a GCC issue, but it might also be (and more probably) just package bug, strict aliasing violation, undefined behavior code etc.
If you suspect a gcc bug, it needs to be first reduced into a small self-contained reproducer.  Thanks.

Comment 3 Eike Rathke 2012-01-20 17:25:44 UTC

(In reply to comment #0)
> icu 4.8.1 previously built fine

@pbrobinson: I noticed you updated the ICU to version 4.8.1.1, did this package actually build with other gcc versions?

Comment 4 Peter Robinson 2012-01-21 14:01:20 UTC

(In reply to comment #3)
> (In reply to comment #0)
> > icu 4.8.1 previously built fine
> 
> @pbrobinson: I noticed you updated the ICU to version 4.8.1.1, did this package
> actually build with other gcc versions?

Scratch build on f16 builds fine
http://koji.fedoraproject.org/koji/taskinfo?taskID=3719806

Comment 5 Jakub Jelinek 2012-01-21 14:40:38 UTC

This turned to be a GCC bug, icu/source/test/cintltst/cbiditst.c u16ToPseudo function is miscompiled.  But next time I'd really appreciate if at least the binary search (if doing brute force search) would be done by package maintainers who know their code better than me.