Date: Wed, 26 Feb 2014 21:26:47 -0500 (EST) From: Benjamin Kaduk <kaduk@MIT.EDU> To: Don Lewis <truckman@freebsd.org> Cc: imb@protected-networks.net, freebsd-current@freebsd.org Subject: Re: firebox build fails post clang-3.4 merge Message-ID: <alpine.GSO.1.10.1402262124291.1213@multics.mit.edu> In-Reply-To: <201402270057.s1R0vkjH084327@gw.catspoiler.org> References: <201402270057.s1R0vkjH084327@gw.catspoiler.org>
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On Wed, 26 Feb 2014, Don Lewis wrote: > On 26 Feb, Michael Butler wrote: >> On 02/18/14 12:10, Michael Butler wrote: >>> Is anyone else seeing firefox failing to install after the clang-3.4 >>> merge? As in xpcshell dumping core .. >> >> An update .. >> >> Recompiling with GCC48 on -current yields the same result. Seems to run >> correctly when invoked from the command-line but seg-faults with "errno >> = 4" (invalid instruction) from the build >> >> Giving up and using the Linux port .. :-( > > I've also seen this problem with clang-3.4 on i386. It looks like a > clang bug to me. Clang is putting ud2 instructions in its output which > are guaranteed to fault when it compiles nsAppRunner.cpp. See > <http://www.freebsd.org/cgi/query-pr.cgi?pr=187103>. That would seem to indicate that clang believes the source code in question is exercising a case which is explicitly listed as giving undefined behavior in the language specification. Presumably that means we need a C++ language lawyer to look over the code in question. -Ben Kaduk
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