usbtools/Makefile

.PHONY: all build_target clean test prebuild
all: build_target

TARGET:=reset_usb_tools
OUTDIR:=build
SRCDIR:=src
LIBDIR:=lib
INC:=-Iinc
CDEF:=
LIBS:=-lusb-1.0
CFLAG := -O1 -g -Wall
LDFLAG:=

CC:=gcc
PROJDIR := $(shell pwd -P)
INC += -I$(SRCDIR)
LDFLAG += -Wl,--rpath=$(LIBDIR)
#SRC:=resetusb.c
SRC:=$(wildcard $(SRCDIR)/*.c)
OBJDIR=$(strip $(OUTDIR))
TARGET:=$(OBJDIR)/$(TARGET)
obj=$(SRC:.c=.o)
#OBJS:=$(addprefix $(OBJDIR)/, $(obj))
OBJS:=$(subst $(SRCDIR)/, $(OBJDIR)/, $(obj))
PRES:=$(OBJS:.o=.p)

DEPS:=$(OBJS:.o=.d)
DEPFLAG:=-MMD -MF 

$(OBJDIR):
	mkdir -p $@

include $(wildcard $(DEPS))

build_target:$(TARGET)

prebuild:$(OBJDIR) $(PRES)

 $(TARGET):$(OBJDIR) $(OBJS)
	@echo build target...
	@$(CC) -o $@ $(OBJS) $(LIBS) $(LDFLAG) 

$(OBJDIR)/%.o: $(SRCDIR)/%.c
	@echo compile  $< ...
	@$(CC) -c $(INC) $(CDEF) $(CFLAG) $< -o $@ $(DEPFLAG) $(OBJDIR)/$*.d -MP

$(OBJDIR)/%.p: $(SRCDIR)/%.c
	@$(CC) -c  -E $(INC) $(CDEF) $(CFLAG) $< -o $@ 

clean:
	rm -rf $(OBJDIR)

test:
	
	@echo $(SRC), $(obj), $(SRCDIR), $(OBJDIR), $(OBJS)