Subzero: Fix build errors from upgrading to clang 3.9 .

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 395 matching lines @@
           -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
 
 $(UNITTEST_OBJS): $(OBJDIR)/unittest/%.o: unittest/%.cpp unittest/*.h \
                   src/*.h src/*.def
         $(CXX) -c $(CXXFLAGS) \
           -Isrc/ \
           -Iunittest/ \
           -I$(LLVM_SRC_PATH)/utils/unittest/googletest/include \
           -I$(LLVM_SRC_PATH) \
           -DGTEST_HAS_RTTI=0 -DGTEST_USE_OWN_TR1_TUPLE \
+          -Wno-expansion-to-defined \
           $< -o $@
 
 $(OBJS): | $(OBJDIR)
 $(SB_OBJS): | $(SB_OBJDIR)
 $(SBB_OBJS): | $(SBB_OBJDIR)
 
 $(UNITTEST_OBJS): | $(OBJDIR)/unittest $(OBJDIR)/unittest/AssemblerX8632 \
                     $(OBJDIR)/unittest/AssemblerX8664
 
 $(OBJDIR):
@@ skipping 185 matching lines @@
 
 help-check-xtest:
         @cat Makefile.standalone-help/check-xtest.txt
 
 clean:
         rm -rf pnacl-sz *.o $(foreach nexe,$(NEXES),$(notdir $(nexe))) \
           $(OBJDIR) $(SB_OBJDIR) $(SBB_OBJDIR) build/*.bloat.json
 
 clean-all: clean
         rm -rf build/  crosstest/Output/