firebox build fails post clang-3.4 merge

[Dimitry Andric]

On 27 Feb 2014, at 01:57, Don Lewis <truckman at FreeBSD.org> 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>.
> 
> I tried compiling the offending file with gcc46 and didn't see the
> problem in the assembly output.

Indeed, this is clang bug with stdcall calling conventions.  See the
upstream bug http://llvm.org/PR19007 (thanks to Benjamin Kramer for
reducing this).

I have followed up on the bug with a workaround, which can be used until
this bug is fixed upstream, and I can import the fix.

-Dimitry

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