Strange error when compiling LibreOffice from master

Hi all,

I'm running Ubuntu 14 on a VM via VirtualBox, when I compile from master I
consistently get the following:

[CXX] cppcanvas/qa/extras/emfplus/emfplus.cxx
[CXX] sc/qa/extras/sccondformats.cxx
[CXX] sc/qa/unit/subsequent_filters-test.cxx
[CXX] sc/qa/unit/subsequent_export-test.cxx
[CXX] sc/qa/unit/bugfix-test.cxx
[CXX] sc/qa/extras/htmlexporttest.cxx
[CXX] sc/qa/unit/opencl-test.cxx
[CXX] sc/qa/unit/copy_paste_test.cxx
[CXX] sw/qa/core/uwriter.cxx
[CXX] sw/qa/core/test_ToxLinkProcessor.cxx
/home/chris/repos/libreoffice/sc/qa/unit/opencl-test.cxx: In static member
function ‘static void
ScOpenCLTest::addTestsToSuite(CppUnit::TestSuiteBuilderContextBase&)’:
/home/chris/repos/libreoffice/sc/qa/unit/opencl-test.cxx:302:300: note:
variable tracking size limit exceeded with -fvar-tracking-assignments,
retrying without
     CPPUNIT_TEST_SUITE(ScOpenCLTest);



                                                                        ^
[CXX] sw/qa/core/test_ToxTextGenerator.cxx
[CXX] sw/qa/extras/docbookexport/docbookexport.cxx
[CXX] sw/qa/extras/htmlexport/htmlexport.cxx
[CXX] sw/qa/extras/htmlimport/htmlimport.cxx
[CXX] sw/qa/core/macros-test.cxx
[CXX] sw/qa/extras/ooxmlexport/ooxmlexport.cxx
[CXX] sw/qa/extras/ooxmlexport/ooxmlexport2.cxx
[CXX] sw/qa/extras/ooxmlexport/ooxmlexport3.cxx
/home/chris/repos/libreoffice/sc/qa/unit/ucalc_formula.cxx: In member
function ‘void Test::testFetchVectorRefArray()’:
/home/chris/repos/libreoffice/sc/qa/unit/ucalc_formula.cxx:474:6: note:
variable tracking size limit exceeded with -fvar-tracking-assignments,
retrying without
 void Test::testFetchVectorRefArray()
      ^
{standard input}: Assembler messages:
{standard input}:1265132: Warning: end of file not at end of a line;
newline inserted
{standard input}:1265305: Error: unknown pseudo-op: `.'
g++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions.
/home/chris/repos/libreoffice/solenv/gbuild/LinkTarget.mk:189: recipe for
target
'/home/chris/repos/libreoffice/workdir/CxxObject/sc/qa/unit/ucalc_formula.o'
failed
make[1]: ***
[/home/chris/repos/libreoffice/workdir/CxxObject/sc/qa/unit/ucalc_formula.o]
Error 4
make[1]: *** Waiting for unfinished jobs....

My version of g++ is:

chris@libreoffice-ia64:~/repos/libreoffice$ g++ --version
g++ (Ubuntu 4.9.2-10ubuntu13) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Anyone have any ideas why the compiler might be barfing? I run make again
and it finishes successfully!

Chris