Created attachment 160505 [details] Fix undefined behavior in libjpeg-turbo's jcdctmgr.c During the exp-run in bug 201377, it was found that graphics/jpeg-turbo gives testing errors with a recent clang 3.7.0 snapshot, on amd64: http://package22.nyi.freebsd.org/data/headamd64PR201377-default/2015-08-20_16h45m13s/logs/errors/libjpeg-turbo-1.4.0.log This is caused by undefined behavior in libjpeg-turbo's quantization function. It was reported upstream here: https://github.com/libjpeg-turbo/libjpeg-turbo/issues/13 and subsequently fixed in this upstream commit: https://github.com/libjpeg-turbo/libjpeg-turbo/commit/4cfa3f4c39c2e46eca3a65c67411d15e08a3fc70 I propose to merge the fix to jcdctmgr.c now, and it can be dropped again when libjpeg-turbo 1.4.2 comes out.
A commit references this bug: Author: antoine Date: Sun Sep 13 20:27:08 UTC 2015 New revision: 396855 URL: https://svnweb.freebsd.org/changeset/ports/396855 Log: Fix negative shift with IFAST FDCT and qual=100 This fixes regression tests with clang 3.7.0 PR: 202762 Obtained from: https://github.com/libjpeg-turbo/libjpeg-turbo/commit/4cfa3f4c39c2e46eca3a65c67411d15e08a3fc70 Approved by: maintainer timeout (15 days) Changes: head/graphics/jpeg-turbo/Makefile head/graphics/jpeg-turbo/files/patch-jcdctmgr.c