Date: Mon, 28 Dec 2015 23:02:13 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 205663] clang++ 3.7.1 gets Bus Errors during compilation on arm that has SCTLR bit[1]==1 (alignment required) Message-ID: <bug-205663-8-aFM6DKOeT4@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-205663-8@https.bugs.freebsd.org/bugzilla/> References: <bug-205663-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D205663 --- Comment #3 from Mark Millard <markmi@dsl-only.net> --- Below is what llvm-org's James Molloy reports about needing -mno-unaligned-access when building clang and clang++ for use in a SCTLR bit[1]=3D=3D1 context: From: bugzilla-daemon@llvm.org Subject: [Bug 25958] FreeBSD 11.0-CURRENT clang++ 3.7.1 gets Bus Errors dur= ing compilation on arm that has SCTLR bit[1]=3D=3D1 (alignment required) Date: December 28, 2015 at 1:28:28 PM PST To: <markmi@dsl-only.net> James Molloy changed bug 25958=20 What Removed Added CC james.molloy@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 a= nd enables strict alignment mode. Cheers, James More notes: I've answered with the example compilation command for the specific clang source file, extracted from a script log of my build: I had used -mno-unaligned-access. --=20 You are receiving this mail because: You are the assignee for the bug.=
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