Adapt to work with rtools.

Author: jolars

src/tbb/build/common_rules.inc

@@ -110,6 +110,12 @@ LINK_FILES+=$(TEST_LIBS)
 	cpp <$< | grep -v '^#' >$*.tmp
 	$(ASM) $(ASM_FLAGS) -o $@ $*.tmp
 
+ifdef rtools
+# Line 70 doesn't work with rtool's version of make. The symptom being that the asm rule kicks off instead, and these rules are cl only
+%.$(OBJ): %.cpp
+	$(CPLUS) $(OUTPUTOBJ_KEY)$@ $(COMPILE_ONLY) $(CPLUS_FLAGS) $(CXX_ONLY_FLAGS) $(CXX_WARN_SUPPRESS) $(INCLUDES) $<
+endif
+
 # Rule for generating .E file if needed for visual inspection
 # Note that ICL treats an argument after PREPROC_ONLY as a file to open,
 # so all uses of PREPROC_ONLY should be immediately followed by a file name