Václav Zindulka <vaclav.zindulka@xxxxxxxxxx> wrote:
> I have problem with compilation (linking) of my program using
> libnftables.h and libnftables library. I always get undefined
> reference no mater how I adjust the command. My app is written in C++
> and I want to use libnftables since I will make a lot of dynamic
> changes in nftable rules (tc categorization of packets). I have
> created simple prototype of app to learn usage of libnftables. I'm
> using git version of nftables since it supports conversion from c++
> string using .c_str() function, which can't be done in 0.9.0 yet. I
> also use latest versions of libnftnl and libmnl. I'm running it on
> Debian Stretch using stock 4.9 and even compiled 4.19 from backport
> sources since I need to apply some patches for production application.
[..]
> /tmp/ccgLgVWC.o: In function `main':
> main.cpp:10: undefined reference to `nft_ctx_new(unsigned int)'
You need to request C-Linkage.
try
extern "C" {
#include <nftables/libnftables.h>
}
