update makefile

Makefile

@@ -6,10 +6,12 @@ PID_DIR = /var/run
 
 # ############################
 
-SRC := $(wildcard *.c)
-TARGET := bcastfwd
-CFLAGS := -O2 -Wall -Wno-unused-result -MMD -I.
-LDFLAGS :=
+SRC = $(wildcard *.c)
+TARGET = bcastfwd
+BUILD_DIR = build
+CFLAGS = -O2 -g -pipe -Wall -Wno-unused-result
+CFLAGS += -MMD -MF $(BUILD_DIR)/$(*D)/$(*F).d
+LDFLAGS =
 
 # ############################
 
@@ -23,15 +25,16 @@ endif
 
 all: $(TARGET)
 
-$(TARGET): $(SRC:%.c=%.o)
+$(TARGET): $(patsubst %,$(BUILD_DIR)/%, $(SRC:.c=.o))
 	@echo " Linking file:  $@"
 	@$(CC) $(LDFLAGS) $^ -o $@
 
-%.o: %.c
+$(BUILD_DIR)/%.o: %.c $(MAKEFILE_LIST)
 	@echo " Building file: $<"
+	@$(shell test -d $(BUILD_DIR)/$(*D) || mkdir -p $(BUILD_DIR)/$(*D))
 	@$(CC) $(CFLAGS) -o $@ -c $<
 
-install: all
+install: $(TARGET)
 	install -D -m 755 -s $(TARGET) $(DESTDIR)$(BINARY_DIR)/$(TARGET)
 	install -D -m 644 $(TARGET).conf $(DESTDIR)$(CONFIG_DIR)/$(NEWCONF)
 	sed -i -e "s:^logfile .*$$:logfile $(LOG_DIR)/$(TARGET).log:" \
@@ -40,6 +43,6 @@ install: all
 	install -d -m 755 $(DESTDIR)$(LOG_DIR)
 
 clean:
-	rm -rf *.d *.o $(TARGET)
+	rm -rf $(BUILD_DIR) $(TARGET)
 
-include $(shell find . -name \*.d 2> /dev/null)
+include $(shell find $(BUILD_DIR) -name \*.d 2> /dev/null)