Index: lldb/trunk/test/make/Makefile.rules
===================================================================
--- lldb/trunk/test/make/Makefile.rules
+++ lldb/trunk/test/make/Makefile.rules
@@ -342,14 +342,16 @@
 #----------------------------------------------------------------------
 # Check if we are compiling with gcc 4.6
 #----------------------------------------------------------------------
-ifneq (,$(filter g++,$(CXX)))
-	CXXVERSION = $(shell g++ -dumpversion | cut -b 1-3)
+ifneq "$(strip $(CXX_SOURCES) $(OBJCXX_SOURCES))" ""
+ifneq "$(filter g++,$(CXX))" ""
+	CXXVERSION = $(shell $(CXX) -dumpversion | cut -b 1-3)
 	ifeq "$(CXXVERSION)" "4.6"
                 # GCC 4.6 cannot handle -std=c++11, so replace it with -std=c++0x
                 # instead. FIXME: remove once GCC version is upgraded.
 		override CXXFLAGS := $(subst -std=c++11,-std=c++0x,$(CXXFLAGS))
 	endif
 endif
+endif
 
 #----------------------------------------------------------------------
 # DYLIB_ONLY variable can be used to skip the building of a.out.