libpcap: 64bit machine has no compatible 32-bit libpcap library

Question

I want to compile a .c file to 32-bit executable using gcc option -m32 with libpcap the machine is linux 64bit fedora 16

however, I get the following error

[root@fdf source]# gcc -m32 -o test_tcp test_tcp.c -lpcap
/usr/bin/ld: skipping incompatible /usr/lib64/libpcap.so when searching for -lpcap
/usr/bin/ld: cannot find -lpcap
 collect2: ld returned 1 exit status

I installed

 yum install libpcap.i686

and then try to compile, but still get errors:

root@ddh-4.0# gcc -m32 -o test_tcp test_tcp.c -lpcap
/usr/bin/ld: skipping incompatible /usr/lib64/libpcap.so when searching for -lpcap
/usr/bin/ld: cannot find -lpcap

Install the 32-bit library? On most modern systems it's possible to have both 64-bit and 32-bit variants installed at the same time. Don't know how it works on Fedora 16, or what the packages are named. — Some programmer dude, Mar 25 '13 at 13:22
I'm just wondering why 64-bit libpcap library doesn't include 32-bit variant? — user138126, Mar 25 '13 at 13:41
The 32bit version library is not included by default. You can install it by "yum install libpcap.i686". — Wu Yongzheng, Mar 25 '13 at 14:56
I installed libpcap.i686, but still get errors: `/usr/bin/ld: cannot find -lpcap` — user138126, Mar 25 '13 at 15:21
ld doesn't find your 32bits libpcap. You could include the install directory of your 32bit libpcap in the environnement variable LD_LIBRARY_PATH to solve this — KrahnacK, Mar 25 '13 at 15:52
how to include the install directory of your 32bit libpcap in the environnement variable LD_LIBRARY_PATH? and how to find the install directory? thanks! — user138126, Mar 25 '13 at 15:57

score 1 · Accepted Answer · answered Mar 25 '13 at 16:09

1

You need the development package in addition to the runtime library. So do

yum install libpcap-devel.i686

answered Mar 25 '13 at 16:09

nos

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if a machine are with tcpdump, that machine doesn't necessarily have libpcap-devel, then can my program run on that machine? thanks! – user138126 Mar 25 '13 at 16:19
Yes, the -devel packages are for development, i.e. compiling and linking, and isn't needed at runtime. – nos Mar 25 '13 at 16:22

libpcap: 64bit machine has no compatible 32-bit libpcap library

1 Answers1