makefile生成静/动态库

通过makefile生成静态库和动态库
目录树

➜  app_hello tree -h
.
├── [ 280]  app_hello.c
├── [ 218]  app_hello.h
└── [ 997]  makefile

0 directories, 3 files

makefile

ROOT_DIR := $(shell pwd)
SRC := $(wildcard *.c)
OBJ := $(patsubst %.c,%.o,$(SRC))

export DFLAGS ?=                               # 库的链接参数
export CFLAGS ?=                               # 参数信息
export CROSS_COMPILE ?=                        # 没有定义交叉编译器时，直接用gcc


export CC := $(CROSS_COMPILE)gcc               # 编译器 按需就行
export AR = ${CROSS_COMPILE}ar
export STRIP = ${CROSS_COMPILE}strip
export AS = ${CROSS_COMPILE}as
export LD = ${CROSS_COMPILE}lr
export RANLIB = ${CROSS_COMPILE}ranlib
export NM = ${CROSS_COMPILE}nm

LIB_SO_NAME := libhello.so
LIB_REAL_NAME := libhello.so.1
LIB_A_NAME :=libhello.a



.PHONY :all clean LIB_SO LIB_A
all: LIB_SO LIB_A

LIB_A : $(OBJ)
	$(AR) r $(LIB_A_NAME) $(OBJ)

LIB_SO : $(OBJ)
	$(info $(SRC) $(OBJ))
	$(CC) $(OBJ) -shared -Wl,-soname,$(LIB_SO_NAME) -o $(LIB_REAL_NAME)

%.o : %.c
	$(CC) -fPIC -c $< -o $@ $(CFLAGS) $(DFLAGS)

clean:
	rm -rf $(OBJ)
	rm -rf $(LIB_REAL_NAME)
	rm -rf $(LIB_A_NAME)

测试

➜  app_hello make clean all
rm -rf app_hello.o
rm -rf libhello.so.1
rm -rf libhello.a
gcc                -fPIC -c app_hello.c -o app_hello.o  
app_hello.c app_hello.o
gcc                app_hello.o -shared -Wl,-soname,libhello.so -o libhello.so.1
ar r libhello.a app_hello.o
ar: creating libhello.a
➜  app_hello nm -D libhello.so.1 
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 w __cxa_finalize
                 w __gmon_start__
0000000000001119 T app_hello
                 U puts
➜  app_hello nm libhello.a 

app_hello.o:
                 U _GLOBAL_OFFSET_TABLE_
0000000000000000 T app_hello
                 U puts