Date: Thu, 09 Feb 2017 15:36:51 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-ports-bugs@FreeBSD.org Subject: [Bug 216770] lang/julia: fails to build with clang 4.0 Message-ID: <bug-216770-13-VD8eVw3zW7@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-216770-13@https.bugs.freebsd.org/bugzilla/> References: <bug-216770-13@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216770 Dimitry Andric <dim@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |emaste@freebsd.org --- Comment #9 from Dimitry Andric <dim@FreeBSD.org> --- (In reply to tavert from comment #8) > Is that working around a compiler bug in clang 4.0, or undefined behavior= in > the source where other compiler versions behaved differently? It's not entirely clear yet. It seems that adding that line, or putting so= me printf's in the ratio() function "fixes" it, either due to some sort of undefined behavior or a compiler bug. So as a quick stopgap it would proba= bly be OK. That said, I did some bisecting of upstream llvm/clang, and this revision causes the trouble: http://llvm.org/viewvc/llvm-project?view=3Drevision&revision=3D280351 ------------------------------------------------------------------------ r280351 | jamesm | 2016-09-01 12:44:35 +0200 (Thu, 01 Sep 2016) | 22 lines [SimplifyCFG] Change the algorithm in SinkThenElseCodeToEnd It shuffles around some code in smisc.c's ratio() function, apparently with interesting effects. I still need to figure out some way of transforming t= his into a test case for upstream, or if it is actually caused by undefined behavior, some workaround that can be applied permanently. --=20 You are receiving this mail because: You are the assignee for the bug.=
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