Date: Tue, 05 Jan 2016 13:08:13 -0700 From: Ian Lepore <ian@freebsd.org> To: Russell Haley <russ.haley@gmail.com>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Bug 205663 Clang getting Bus Errors (arm SCLTR Bit[12]==1 context): Reported fixed on llvm's trunk Message-ID: <1452024493.1320.37.camel@freebsd.org> In-Reply-To: <CABx9NuSoEK%2BtoSWGnO98_noZf3N_-D4Vdmpy_gNroJdYtZKoPA@mail.gmail.com> References: <C90F0ABA-3C59-4FE1-AAB4-99F8FF32FB24@dsl-only.net> <CANCZdfoWDg_ZX8zxqRV2-Q6teYf_Ef4f3VKB0fhb0sikcW3hUA@mail.gmail.com> <1452020032.1320.21.camel@freebsd.org> <CABx9NuSoEK%2BtoSWGnO98_noZf3N_-D4Vdmpy_gNroJdYtZKoPA@mail.gmail.com>
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On Tue, 2016-01-05 at 12:05 -0800, Russell Haley wrote: > On Tue, Jan 5, 2016 at 10:53 AM, Ian Lepore <ian@freebsd.org> wrote: > > > > On Tue, 2016-01-05 at 11:35 -0700, Warner Losh wrote: > > > On Tue, Jan 5, 2016 at 11:27 AM, Mark Millard < > > > markmi@dsl-only.net> > > > wrote: > > > > > > > llvm.org's Bugzilla reports that clang trunk has been fixed and > > > > clang 3.8 > > > > will contain the fixes: > > > > > > > > James Molloy changed bug 25958 > > > > What Removed Added > > > > Status NEW RESOLVED > > > > Resolution --- FIXED > > > > Comment # 8 on bug 25958 from James Molloy > > > > Hi Mark, > > > > > > > > Thanks for your detailed investigation. I can confirm that this > > > > is > > > > fixed on > > > > trunk and therefore will be fixed for LLVM 3.8. > > > > > > > > The fixes were done for SPARC, which requires strict accesses > > > > much > > > > as ARM > > > > does > > > > with SCTLR=1. > > > > > > > > There was a sequence of commits by James Knight that fixed > > > > these, > > > > but an > > > > example is http://reviews.llvm.org/rL242554 . > > > > > > > > The fixes were in a similar vein to yours, but required changes > > > > in > > > > fewer > > > > places > > > > and there were a few more sticky issues to solve too. I'll CC > > > > James > > > > here in > > > > case he wants to comment on the current state of the clang > > > > codebase > > > > for > > > > self-hosting in a strict alignment environment. > > > > > > > > Cheers, > > > > > > > > James > > > > > > > > > > There's a projects/clang-380-import that you might want to try... > > > > It's a non-starter for us, because unfortunately they appear to > > have > > removed support for the -arm-use-movt=0 command line option, so now > > we > > can't build ubldr or kernel modules. > > Does this mean FreeBSD can't ever move to clang 3.8? > > Russ No, it means we have to figure out how we're going to fix or workaround the situation before clang 3.8 can get moved from its experimental branch into -current. Whatever we come up with, we can make a local patch, and submit the change back upstream. -- Ian
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