最近在搞根文件系统的移植，busybox使用的版本是1.6.1，动态编译， 但是出现很多警告，一开始以为问题不大，但是进入控制台发现ifconfig命令没有用，这个命令已经配置了，后面我还需要移植thttpd服务器，所以要用到这个命令设置ip地址。出现的问题如下，请帮忙看看是什么原因。
CC coreutils/env.o
CC coreutils/expr.o
coreutils/expr.c: In function `eval6':
coreutils/expr.c:280: warning: `l' might be used uninitialized in this function
CC coreutils/false.o
CC coreutils/fold.o
CC coreutils/libcoreutils/cp_mv_stat.o
CC coreutils/libcoreutils/getopt_mk_fifo_nod.o
coreutils/libcoreutils/getopt_mk_fifo_nod.c:27: warning: no previous prototype for `getopt_mk_fifo_nod'
AR coreutils/libcoreutils/lib.a
LD debianutils/built-in.o
CC debianutils/mktemp.o
CC debianutils/pipe_progress.o
CC debianutils/readlink.o
CC debianutils/run_parts.o
CC debianutils/start_stop_daemon.o
CC debianutils/which.o
AR debianutils/lib.a
LD e2fsprogs/built-in.o
CC e2fsprogs/chattr.o
CC e2fsprogs/e2fs_lib.o
CC e2fsprogs/fsck.o
CC e2fsprogs/lsattr.o
AR e2fsprogs/lib.a
LD editors/built-in.o
CC editors/awk.o
CC editors/ed.o
CC editors/patch.o
CC editors/sed.o
CC editors/vi.o
AR editors/lib.a
LD findutils/built-in.o
CC findutils/find.o
findutils/find.c: In function `parse_params':
findutils/find.c:466: warning: no previous prototype for `alloc_action'
CC findutils/grep.o
CC findutils/xargs.o
AR findutils/lib.a
LD init/built-in.o
CC init/halt.o
CC init/init.o
CC networking/zcip.o
AR networking/lib.a
LD networking/libiproute/built-in.o
CC networking/libiproute/ip_parse_common_args.o
networking/libiproute/ip_parse_common_args.c: In function `ip_parse_common_args':
networking/libiproute/ip_parse_common_args.c:45: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/ip_parse_common_args.c:64: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
CC networking/libiproute/ipaddress.o
networking/libiproute/ipaddress.c: In function `ipaddr_modify':
networking/libiproute/ipaddress.c:727: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
CC networking/libiproute/iplink.o
CC networking/libiproute/iproute.o
CC networking/libiproute/iprule.o
networking/libiproute/iprule.c: In function `iprule_modify':
networking/libiproute/iprule.c:228: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iprule.c:229: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iprule.c:230: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iprule.c:248: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iprule.c:254: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iprule.c:267: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iprule.c:277: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
CC networking/libiproute/iptunnel.o
networking/libiproute/iptunnel.c: In function `parse_args':
networking/libiproute/iptunnel.c:251: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iptunnel.c: In function `do_iptunnel':
networking/libiproute/iptunnel.c:507: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iptunnel.c:509: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iptunnel.c:511: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iptunnel.c:513: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iptunnel.c:514: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/iptunnel.c:515: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
CC networking/libiproute/libnetlink.o
CC networking/libiproute/ll_addr.o
CC networking/libiproute/ll_map.o
CC networking/libiproute/ll_proto.o
CC networking/libiproute/ll_types.o
CC networking/libiproute/rt_names.o
CC networking/libiproute/rtm_map.o
networking/libiproute/rtm_map.c: In function `rtnl_rtntype_a2n':
networking/libiproute/rtm_map.c:61: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:64: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:66: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:68: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:70: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:72: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:74: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
networking/libiproute/rtm_map.c:76: warning: `matches' is deprecated (declared at networking/libiproute/utils.h:79)
CC networking/libiproute/utils.o
AR networking/libiproute/lib.a
LD networking/udhcp/built-in.o
CC networking/udhcp/arpping.o
CC networking/udhcp/clientpacket.o
CC networking/udhcp/clientsocket.o
CC networking/udhcp/common.o
CC networking/udhcp/dhcpc.o
