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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