[dpdk-dev] g++: undefined reference to

Stefan Baranoff sbaranoff at gmail.com
Thu Jan 2 14:19:56 CET 2014


I do not think your attachments made it through but it looks like you are
not linking the DPDK object files in this line:
g++ helloClass.o

There would need to be many more files beyond helloClass.o listed. Try
adding the relevant DPDK object files (I do not have the path off hand but
I believe they are in the "build" folder) and recompiling. The files you
need to add are those built when your build DPDK itself.

This is similar to missing -lpcap if compiling against libpcap but in this
case you need to link against object files, not a shared library.

Good luck!

Sent from my smart phone; people don't make typos, Swype does!
On Jan 2, 2014 4:35 AM, "Hamid Ramazani" <mrramazani at gmail.com> wrote:

> Hi,
> I wanted to write a simple program using class (object oriented). I've
> attached my helloClass.cpp and also Makefile. after runnig make I get
> below errors.
> I think:
> 1. it is the problem of using c code in c++
> 2. I've used extern "C" in helloClass.cpp
> 3. Should I recompile the DPDK from source with gcc -c argument for
> compatibility with g++?
> Thanks in advance.
> g++ -c  helloClass.cpp
> -I/home/hamid/dpdk/dpdk-1.5.1r1/x86_64-default-linuxapp-gcc/include
> g++ helloClass.o
> -I/home/hamid/dpdk/dpdk-1.5.1r1/x86_64-default-linuxapp-gcc/include
> -lstdc++
> helloClass.o: In function `rte_lcore_id':
> helloClass.cpp:(.text+0x7): undefined reference to `per_lcore__lcore_id'
> helloClass.o: In function `rte_get_master_lcore':
> helloClass.cpp:(.text+0x15): undefined reference to
> `rte_eal_get_configuration'
> helloClass.o: In function `rte_lcore_is_enabled':
> helloClass.cpp:(.text+0x2a): undefined reference to
> `rte_eal_get_configuration'
> helloClass.o: In function `HelloClass::HelloClass(int, char**)':
> helloClass.cpp:(.text._ZN10HelloClassC2EiPPc[_ZN10HelloClassC5EiPPc]+0x20):
> undefined reference to `rte_eal_init'
> helloClass.cpp:(.text._ZN10HelloClassC2EiPPc[_ZN10HelloClassC5EiPPc]+0x4b):
> undefined reference to `__rte_panic'
> helloClass.o: In function `HelloClass::run()':
> helloClass.cpp:(.text._ZN10HelloClass3runEv[HelloClass::run()]+0x3f):
> undefined reference to `rte_eal_remote_launch'
> helloClass.cpp:(.text._ZN10HelloClass3runEv[HelloClass::run()]+0x80):
> undefined reference to `rte_eal_mp_wait_lcore'
> collect2: ld returned 1 exit status
> make: *** [helloClass.o] Error 1
> All the Best,
> Hamid

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