Bug 497298 – sys-devel/llvm-3.4 miscompiles code with varargs

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Holger Hoffstätte 2014-01-06 18:16:56 UTC]

See URL; basically a pretty bad bug that didn't make it for 3.4, as described in: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20131216/199116.html

Adding those patches (r197503, r197505, r197520) from upstream would prevent a lot of upfront pain. They are small and will be in future releases.

Reproducible: Always

Steps to Reproduce:
see $URL

Actual Results:  
see $URL


Expected Results:  
see $URL

[Comment 1 Holger Hoffstätte 2014-01-06 18:44:32 UTC]

The relevant patches can be found at:

http://llvm.org/viewvc/llvm-project?view=revision&revision=197503
http://llvm.org/viewvc/llvm-project?view=revision&revision=197505
http://llvm.org/viewvc/llvm-project?view=revision&revision=197520

[Comment 2 Holger Hoffstätte 2014-01-06 22:46:29 UTC]

Created attachment 367222 [details, diff]
r197503 1/4

[Comment 3 Holger Hoffstätte 2014-01-06 22:46:49 UTC]

Created attachment 367224 [details, diff]
r197503 2/4

[Comment 4 Holger Hoffstätte 2014-01-06 22:47:12 UTC]

Created attachment 367226 [details]
r197503 3/4

[Comment 5 Holger Hoffstätte 2014-01-06 22:47:33 UTC]

Created attachment 367228 [details]
r197503 4/4

[Comment 6 Holger Hoffstätte 2014-01-06 22:47:59 UTC]

Created attachment 367230 [details, diff]
r197505

[Comment 7 Holger Hoffstätte 2014-01-06 22:48:20 UTC]

Created attachment 367232 [details, diff]
r197520

[Comment 8 Holger Hoffstätte 2014-01-06 22:49:29 UTC]

(In reply to Holger Hoffstätte from comment #1)

I've extracted and attached the patches with meaningful (ordered) names so you don't have to. Hope this helps.

[Comment 9 Bernard Cafarelli 2014-01-08 13:32:18 UTC]

Hmm that's a nasty bug, thanks for the report and patch hunting! I added the patch to current (masked) 3.4 ebuild, tests still run fine