make diff ok

C/MakefileCommon

@@ -105,13 +105,15 @@ $(NAME): $(OBJS)
 leaks: $(NAME)
 	valgrind --leak-check=full --show-leak-kinds=all $(CREATE_CLONE)
 
-run:
+run: $(NAME)
 	$(CREATE_CLONE)
 
-diff: $(NAME)
+diff: $(CLONES)
 	@echo $(CYAN)"compare source with output :"$(RESET)
-	- diff --color $(CLONE) $(SRCS); \
-		if [  $$? -eq 0 ]; then echo $(GREEN)"Files $(SRCS) and $(CLONES) are identical"$(RESET); else echo $(RED)":Files $(SRCS) and $(CLONES) differ"$(RESET); fi
+	@for clone in $^; do \
+		diff --color $$clone $(SRCS); \
+		if [  $$? -eq 0 ]; then echo $(GREEN)"Files $(SRCS) and $$clone are identical"$(RESET); else echo $(RED)":Files $(SRCS) and $$clone differ"$(RESET); fi \
+	done
 
 clean:
 	$(RM_OBJS)