Hi,
Yes, you can edit the Makefile as follows:
#VisualGDB: FileSpecificTemplates #<--- VisualGDB will use the following lines to define rules for source files in subdirectories
$(BINARYDIR)/%.o : %.cpp $(all_make_files) |$(BINARYDIR)
$(CXX) $(CXXFLAGS) -c $< -o $@ -MD -MF $(@:.o=.dep)
$(CXX) $(CXXFLAGS) -S $< -o $(@:.o=.S)
Then modify the SOURCEFILES line so that VisualGDB regenerates the file-specific templates. This should start generating a .S file for each source file.