<分区>
我正在尝试创建一个依赖于多个 C 静态库的 C 可执行文件。
我有两个库:
../libs/libsulibs.a 和 ../ppm_client/libppm_client.a。 libppm_client.a调用了libsulibs.a
这是我的 Makefile
../libs/生成文件
LIBS=-lpthread
CC=gcc
CFLAGS=-Wall -g
INCLUDES=-I .
OBJ=WheelTimer.o threadApi.o LinkedListApi.o
TARGET=libsulibs.a
${TARGET}:$(OBJ)
ar rs ${TARGET} $(OBJ)
%.o:%.c
${CC} ${CFLAGS} -c ${INCLUDES} $<
clean:
rm *.o
rm ${TARGET}
我通过这个makefile成功创建了libsulibs.a
../ppm_client/Makefile
CC=gcc
CFLAGS=-Wall -g
INCLUDES=-I . -I ../libs -I ../ppm
OBJ=ppm_pkt_enums.o ppm_client.o ppm_client_sock.o
TARGET=libppm_client.a
${TARGET}:$(OBJ)
ar rs ${TARGET} ${OBJ}
ppm_pkt_enums.o:ppm_pkt_enums.c
gcc -g -c ${INCLUDES} ppm_pkt_enums.c -o ppm_pkt_enums.o
ppm_client.o:ppm_client.c
gcc -g -c ${INCLUDES} ppm_client.c -o ppm_client.o
ppm_client_sock.o:ppm_client_sock.c
gcc -g -c ${INCLUDES} ppm_client_sock.c -o ppm_client_sock.o
clean:
rm *.o
rm ${TARGET}
此 makefile 也成功创建了 libppm_client.a。
现在，在当前目录中，我有主要的 Makefile 来创建可执行文件
CC=gcc
CFLAGS=-g -Wall
STANDARD_LIBS=-lpthread
PPM_OBJ=ppm.o ppm_main.o
LIBS_OBJ=libs/LinkedListApi.o libs/threadApi.o libs/WheelTimer.o
PPM_LIBS=../libs/libsulibs.a
PPM_CLIENT_LIBS=../ppm_client/libppm_client.a
INCLUDES=-I . -I ../libs -I ../ppm_client
TARGET:exe ${PPM_LIBS} ${PPM_CLIENT_LIBS}
ppm.o:ppm.c
gcc -g -c ${INCLUDES} ppm.c -o ppm.o
ppm_main.o:ppm_main.c
gcc -g -c ${INCLUDES} ppm_main.c -o ppm_main.o
${PPM_LIBS}:
(cd ../libs; make)
${PPM_CLIENT_LIBS}:
(cd ../ppm_client; make)
exe:${PPM_LIBS} ${PPM_OBJ} ${STANDARD_LIBS} ${PPM_CLIENT_LIBS}
${CC} ${CFLAGS} ${PPM_OBJ} -o exe -L ../libs -lsulibs -L ../ppm_client -lppm_client ${STANDARD_LIBS}
clean:
rm *.o
(cd ../libs; make clean)
(cd ../ppm_client; make clean)
rm exe
但是当我运行 make 时，它以错误结束:undefined reference to pthread_init。 pthread_init 是定义在 libsulibs.a 中的函数，它依赖于标准的 pthread 库。
vm@vm:~/Documents/PeriodicPacketManager/ppm$ make
(cd ../libs; make)
make[1]: Entering directory `/home/vm/Documents/PeriodicPacketManager/libs'
gcc -Wall -g -c -I . WheelTimer.c
gcc -Wall -g -c -I . threadApi.c
gcc -Wall -g -c -I . LinkedListApi.c
ar rs libsulibs.a WheelTimer.o threadApi.o LinkedListApi.o
ar: creating libsulibs.a
make[1]: Leaving directory `/home/vm/Documents/PeriodicPacketManager/libs'
gcc -g -c -I . -I ../libs -I ../ppm_client ppm.c -o ppm.o
gcc -g -c -I . -I ../libs -I ../ppm_client ppm_main.c -o ppm_main.o
(cd ../ppm_client; make)
make[1]: Entering directory `/home/vm/Documents/PeriodicPacketManager/ppm_client'
gcc -g -c -I . -I ../libs -I ../ppm ppm_pkt_enums.c -o ppm_pkt_enums.o
gcc -g -c -I . -I ../libs -I ../ppm ppm_client.c -o ppm_client.o
gcc -g -c -I . -I ../libs -I ../ppm ppm_client_sock.c -o ppm_client_sock.o
ar rs libppm_client.a ppm_pkt_enums.o ppm_client.o ppm_client_sock.o
ar: creating libppm_client.a
make[1]: Leaving directory `/home/vm/Documents/PeriodicPacketManager/ppm_client'
gcc -g -Wall ppm.o ppm_main.o -o exe -L ../libs -lsulibs -L ../ppm_client -lppm_client -lpthread
../ppm_client/libppm_client.a(ppm_client_sock.o): In function `ppm_client_init_socket':
/home/vm/Documents/PeriodicPacketManager/ppm_client/ppm_client_sock.c:138: undefined reference to `pthread_init'
collect2: error: ld returned 1 exit status
make: *** [exe] Error 1
请帮助我在这里缺少什么。