目录结构：

CommomLib--|inc

                   --|src

                   --|obj

                   --|lib

                   --|Makefile

GCC	:= gcc
GXX	:= g++
LD	:= ld
AR	:= ar

LDFLAGS	:= -shared -fpic
ARFLAGS	:= -rc
CFLAGS	:= -g -Wall -fpic

DIR_INC	:= ./inc
DIR_SRC	:= ./src
DIR_OBJ	:= ./obj
DIR_LIB	:= ./lib

LIB_NAME	:= commonLib

SRC	:= $(wildcard ${DIR_SRC}/*.c)
OBJ	:= $(patsubst %.c, ${DIR_OBJ}/%.o, $(notdir ${SRC}))

SHARE_LIB	:= $(LIB_NAME).so
DYNAMIC_LIB	:= $(LIB_NAME).a

INC	:= -I${DIR_INC}
 
all:$(OBJ)
	$(LD) $(LDFLAGS) -o $(DIR_LIB)/$(SHARE_LIB) $(OBJ)
	#${AR} ${ARFLAGS} $(DIR_LIB)/$(DYNAMIC_LIB) $(OBJ)
	${DIR_OBJ}/%.o:${DIR_SRC}/%.c
	@echo Compiling $(OBJ) ...
	$(GCC) $(CFLAGS) -o $@ -c $< ${INC} -g
clean:
	rm -rf $(DIR_OBJ)/*.o $(DIR_LIB)/*.so $(DIR_LIB)/*.a