llvm.org's James Molloy on the need for -mno-unaligned-access for SCTLR bit[1]==1 arm contexts

[Mark Millard]

Begin forwarded message:

> From: bugzilla-daemon at llvm.org
> Subject: [Bug 25958] FreeBSD 11.0-CURRENT clang++ 3.7.1 gets Bus Errors during compilation on arm that has SCTLR bit[1]==1 (alignment required)
> Date: December 28, 2015 at 1:28:28 PM PST
> To: <markmi at dsl-only.net>
> 
> James Molloy changed bug 25958 
> What	Removed	Added
> CC	 	james.molloy at arm.com
> 
> Comment # 2 on bug 25958 from James Molloy
> Hi Mark,
> 
> Thanks for raising this. Before checking the specifics of what you found - did
> you compile Clang with -mno-unaligned-access? We will by default compile
> assuming SCTLR.A is 0. -mno-unaligned-access switches this assumption off and
> enables strict alignment mode.
> 
> Cheers,
> 
> James


===
Mark Millard
markmi at dsl-only.net