build fix

runtime/Makefile

@@ -12,28 +12,24 @@ PROJECT = libvortexrt
 
 SRCS = ./src/vx_start.S ./src/vx_print.S ./src/vx_print.c ./src/vx_spawn.c
 
-OBJS := $(SRCS:.S=.o) $(SRCS:.c=.o)
+OBJS := $(addsuffix .o, $(notdir $(SRCS)))
 
 all: $(PROJECT).a $(PROJECT).dump
 
-$(PROJECT).a: $(OBJS)
-	$(AR) rc $(PROJECT).a $^
-	
 $(PROJECT).dump: $(PROJECT).a
 	$(DP) -D $(PROJECT).a > $(PROJECT).dump
 
-%.o: src/%.S
-	$(CC) $(CFLAGS) -c -o $@ $<
+%.S.o: src/%.S
+	$(CC) $(CFLAGS) -c $< -o $@
 
-%.o: src/%.c
-	$(CC) $(CFLAGS) -c -o $@ $<
+%.c.o: src/%.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(PROJECT).a: $(OBJS)
+	$(AR) rc $(PROJECT).a $^
 
 .depend: $(SRCS)
 	$(CC) $(CFLAGS) -MM $^ > .depend;
 
 clean:
-	rm -rf *.a *.o *.dump .depend
-
-ifneq ($(MAKECMDGOALS),clean)
-    -include .depend
-endif
+	rm -rf *.a *.o *.dump .depend