undefined reference to 'pthread_create'
undefined reference to 'pthread_join'
问题原因:
pthread 库不是 Linux 系统默认的库,连接时需要使用静态库 libpthread.a,所以在使用pthread_create()创建线程,以及调用 pthread_atfork()函数建立fork处理程序时,需要链接该库。
问题解决:
在编译中要加 -lpthread参数
gcc thread.c -o thread -lpthread
thread.c为你些的源文件,不要忘了加上头文件#include
############################################################# File: Makefile ############################################################# INSTALLDIR = $(EXEC_DIR) INCLUDES += -I ./ -I$(PUBLIC_INCLUDE_DIR) -I ./sysctrl -I include CC = $(BUILD_TOOL_PREFIX)gcc $(INCLUDES) $(C_FLAGS) CFLAGS += -Wall -O3LDFLAGS += -sBIN = annpOBJS = annp.o utils.o LINK_TARGET = $(APP_LIB_DIR)/file_msg_drv.a $(APP_LIB_DIR)/sysctrl.a \、 LDFLAGS = -g -lpthread SOURCES = $(wildcard *.c) REL_OBJ = $(SOURCES:%.c=%.o) all: $(REL_OBJ) $(CC) $(LDFLAGS) -o $(BIN) annp.o utils.o $(LINK_TARGET) $(LDFLAGS) REL_OBJ = $(SOURCES:%.c=%.o) install: all cp $(BIN) $(INSTALLDIR) #cp -a -f lib/*.so* $(ROOT_FILE_SYS)/usr/lib/ uninstall: rm -rf $(INSTALLDIR)/$(BIN) clean: rm -f $(BIN) $(BIN).{elf,gdb} $(OBJS)