makefile编写差异
由于zlib动态库在linux下引用的问题引出了对于简练的makefile的学习。之前通过看网络上的一些文章自己也算简单了解如何编写一个makefile，可总是不那么美观，今天经过辉哥的指点，对于makefile做了调整，看下两者之间的差别吧。如果有更好的方法，欢迎指点。
第一次文件如下：
CPP=filehead.cpp xmailuncompress.cpp zlibstrage.cpp compressfactory.cpp md5.cppOBJ = md5.o compressfactory.o filehead.o xmailuncompress.o zlibstrage.o.PHONY:ALLALL: libcompress.a libcompress.so onlyUncompress mytestHEAD = -I./include/mytest: main.cpp g++ main.cpp -g -L. -lcompress -L./so/ -llogger ${HEAD} -I. -o $@ rm -f *.o onlyUncompress:unCompress.cpp g++ unCompress.cpp -g -L. -lcompress -L./so/ -llogger ${HEAD} -I. -o $@libcompress.a:$(OBJ) ar -rc libcompress.a $(OBJ) libcompress.so:$(CPP) g++ -g -fPIC -shared -Wl,-rpath ./so/ -L./so -lz -llogger ${CPP} -o $@ ${HEAD} cp libcompress.so ./so/compressfactory.o:compressfactory.cpp g++ -c compressfactory.cpp ${HEAD}filehead.o:filehead.cpp g++ -c filehead.cpp ${HEAD}xmailuncompress.o:xmailuncompress.cpp g++ -c xmailuncompress.cpp ${HEAD}zlibstrage.o:zlibstrage.cpp g++ -c zlibstrage.cpp -L./so -lz ${HEAD}md5.o:md5.cpp g++ -c md5.cpp ${HEAD}install: cp libcompress.so ../libcomp/so/ cp ./so/*.so ../libcomp/so/ cp *.h ../libcomp/include/ cp ./include/* ../libcomp/include/ cp *.h ../dfs_api/include/compress/ cp libcompress.so ../dfs_api/lib/clean: rm -f *.o rm -f libcompress.a rm -f mytest rm -f onlyUncompress rm -f libcompress.so
经过修改后的makefile如下：
CPP=main.cpp filehead.cpp xmailuncompress.cpp zlibstrage.cpp compressfactory.cpp md5.cppFLAG= -c -g -fPIC -sharedOBJ=filehead.o xmailuncompress.o zlibstrage.o compressfactory.o md5.o.PHONY:ALLall:libcompress.a libcompress.so onlyUncompress mytestHEAD= -I./include/ -I.LIB= -L./ -llogger -lzmytest: main.o g++ $< -g -L. -lcompress ${LIB} ${HEAD} -I. -o $@ rm -f *.o onlyUncompress:unCompress.cpp g++ unCompress.cpp -g -L. -lcompress ${LIB} ${HEAD} -I. -o $@libcompress.a:$(OBJ) ar -rc libcompress.a $(OBJ) libcompress.so:$(OBJ) g++ -g -fPIC -shared -Wl,-rpath ${LIB} $(OBJ) -o $@ ${HEAD}.cpp.o: g++ $(HEAD) $(FLAG) -o $@ $< install: cp libcompress.so ../libcomp/so/ cp *.so ../libcomp/so/ cp *.h ../libcomp/include/ cp ./include/* ../libcomp/include/ cp *.h ../dfs_api/include/compress/ cp libcompress.so ../dfs_api/lib/clean: rm -f *.o rm -f libcompress.a rm -f mytest rm -f onlyUncompress rm -f libcompress.so
两者对比来看是不是后者清晰简练不少
顺带的了解了两个小的知识点：
在makefile中$>代表引用“：”后的内容，，，$@引用“：”前的内容