I want to use the libnetlink library shipped with iproute2. I specified it's include dir with -I and it's lib dir with -L. However I still get some undefined reference errors.
test.c: In function ‘addqdisc’:test.c:26:3: warning: ignoring return value of ‘rtnl_open’, declared with attribute warn_unused_result [-Wunused-result] 26 | rtnl_open(rth, 0); | ^~~~~~~~~~~~~~~~~test.c:27:3: warning: ignoring return value of ‘rtnl_talk’, declared with attribute warn_unused_result [-Wunused-result] 27 | rtnl_talk(rth, &req.n, NULL); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~/usr/bin/ld: /tmp/ccCnXM9F.o: in function `addqdisc':test.c:(.text+0x79): undefined reference to `rtnl_open'/usr/bin/ld: test.c:(.text+0x97): undefined reference to `rtnl_talk'#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <fcntl.h>#include <asm/types.h>#include <sys/socket.h>#include <linux/netlink.h>#include <linux/rtnetlink.h>#include <libnetlink.h>#include <netinet/in.h>#include <arpa/inet.h>int addqdisc() { struct rtnl_handle *rth; struct { struct nlmsghdr n; struct tcmsg t; char buf[64*1024]; } req = { .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_EXCL | NLM_F_CREATE, .n.nlmsg_type = RTM_NEWQDISC, .t.tcm_family = AF_UNSPEC, }; rtnl_open(rth, 0); rtnl_talk(rth, &req.n, NULL);}int main() { addqdisc(); return 0;}gcc test.c -o test -I/pwd/Downloads/linux-5.17/iproute2/include -l /pwd/Downloads/linux-5.17/iproute2/lib/libnetlink.a -lnetlink -static
Anyone knows why?