Bug 1645850

Summary:	Mesa 18.2.3 and above packaged by Fedora fails to compile some shaders
Product:	[Fedora] Fedora	Reporter:	madcatx
Component:	gcc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	urgent
Version:	29	CC:	ajax, aoliva, bskeggs, caillon+fedoraproject, carlwgeorge, davejohansen, dmalcolm, eclipseo, fschwarz, fweimer, igor.raits, jakub, jglisse, john.j5live, jwakely, kparal, law, mpolacek, msebor, nickc, rclark, rhughes, rstrode, thatslyude
Target Milestone:	---	Keywords:	Regression
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Hardware:	Unspecified
OS:	Unspecified
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Last Closed:	2018-11-05 10:44:47 UTC	Type:	Bug
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Description madcatx 2018-11-04 11:43:07 UTC

I noticed the problem even with Fedora 28 when I installed mesa-18.2.3 from a copr repository. At that time I treated it as a defect of the unofficial package. Now after the update to F29 I installed mesa-18.2.3 from "updates-testing" and it exhibits the very same problem. Attempts to bisect the issue did not get me anywhere because the issue does not seem to be a mesa issue. If I compile mesa -18.2.2 locally on my machine it misbehaves in exactly the same way as mesa-18.2.3. The only workaround for this issue is a downgrade to official mesa-18.2.2 packages. It would appear that some mesa dependency has changes at some point between mesa-18.2.2 and mesa-18.2.3 release and mesa packages built after this change are defective.

Relevant Freedesktop bugreport: https://bugs.freedesktop.org/show_bug.cgi?id=108646

Comment 1 Robert-André Mauchin 🐧 2018-11-04 12:41:56 UTC

Seems the culprit is gcc: compiled with gcc-8.2.1-2 it works, with gcc-8.2.1-4 it doesn't.

Comment 2 madcatx 2018-11-04 13:48:52 UTC

Confirmed. Rolling back to gcc-8.2.1-2 and rebuilding mesa (18.2.4 in my case) gets things back in order for me too. The amount of changes between the -2 and -4 releases seems to be too big for me to bisect this.

Comment 3 Robert-André Mauchin 🐧 2018-11-04 17:06:34 UTC

8.2.1-3 works. I'll try to svn-bisect the thingie. Why GNU isn't using GIT in 2018.

Comment 4 Dave Malcolm 2018-11-05 00:48:17 UTC

(In reply to Robert-André Mauchin from comment #3)
> 8.2.1-3 works. I'll try to svn-bisect the thingie. Why GNU isn't using GIT
> in 2018.

FWIW there's a git mirror of gcc svn:
  https://gcc.gnu.org/wiki/GitMirror

Comment 5 Jakub Jelinek 2018-11-05 10:44:47 UTC


*** This bug has been marked as a duplicate of bug 1645400 ***