Libpcap example doesnt work but project builds in eclipse?

Question

I am running the following libpcap example on Ubuntu, within eclipse:

http://www.tcpdump.org/pcap.html

#include <stdio.h>
#include <pcap.h>

int main(int argc, char *argv[])
{
    char *dev, errbuf[PCAP_ERRBUF_SIZE];

    dev = pcap_lookupdev(errbuf);
    if (dev == NULL) {
        fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
        return(2);
    }
    printf("Device: %s\n", dev);
    return(0);
}

I included the library path to the libpcap.a file in the eclipse settings for the GCC C++ linker. When I build the project I get:

g++ -L/usr/lib/x86_64-linux-gnu/ -o"test" ./src/test.o -llibpcap.a /usr/bin/ld: cannot find -llibpcap.a collect2: ld returned 1 exit status make: * [test] Error 1

I dont see why the path is /usr/bin/ld when I set it to "/usr/lib/x86_64-linux-gnu/" within the linker library search path (libraries -L)? I also set (libraries -l) within GCC C++ linker to "libpcap.a"

Do I need to set both? Have I done this correctly? My pcap files are located at /usr/lib/x86_64-linux-gnu/

Interestingly if I write non-pcap C++ but include pcap.h the code builds with no errors.

user997112 user997112 · Accepted Answer · 2011-11-21T23:02:13

OK you need to enter 'pcap' in the top window for the -l argument and then put your directory to the pcap files in the bottom window -L on eclipse, these are both within the GCC C++ Linker library section.

Libpcap example doesnt work but project builds in eclipse?

1 Answers