工程Makefile写法

#SDK测试程序

CXX   =  g++
#执行c++编译器的命令行参数
CXXFLAGS = -Wall -Wno-strict-aliasing -Wno-unused-variable

#包含头文件路径，类似这个 下面很多用到的就是函数
SUBDIR   = $(shell ls ../../src -R | grep /)
../../src:
#字符串替换 将：替换为/
SUBDIRS  = $(subst :,/,$(SUBDIR))
#得到路径 ../../src/
#头文件路径
INCPATHS = $(subst ../../,-I../../,$(SUBDIRS))
#加一个include目录下的头文件
INCPATHS += -I../../include/

VPATH = $(subst : ,:,$(SUBDIR))./
SOURCE = $(foreach dir,$(SUBDIRS),$(wildcard $(dir)*.cpp))

#将cpp的路径名称的.cpp后缀换为.o
OBJS = $(patsubst %.cpp,%.o,$(SOURCE))
#取出.o的文件名，不带路径
OBJFILE  = $(foreach dir,$(OBJS),$(notdir $(dir)))
#.o输出到.OBJ目录下
OBJSPATH = $(addprefix obj/,$(OBJFILE)) 
#库文件路径
LIBPATH = ../lib/
#这句话就没看懂了# 动态库的用法 
LIBS = -Wl,-rpath=./:./HCNetSDKCom:../lib -lhcnetsdk
EXE = ../lib/sdkTest

$(EXE):$(OBJFILE)
	$(CXX) -L$(LIBPATH)  -o $(EXE) $(OBJFILE) $(INCPATHS) $(LIBS)

$(OBJFILE):%.o:%.cpp
	$(CXX)  -c -o $@ $<  $(INCPATHS) -pipe -g -Wall

#依赖文件
DPPS = $(patsubst %.cpp,%.dpp,$(SOURCE))
include $(DPPS)
%.dpp: %.cpp	
	g++ $(INCPATHS) -MM $(CPPFLAGS) $< > $@.$$$$; \
	sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
	rm -f $@.$$$$ 
	

.PHONY:clean
clean:
	rm -rf $(OBJFILE)
	rm -rf $(DPPS)
	rm -rf $(EXE)