[lwip-users] Lwip linker error in Mac

[arun . mahasenan]

Hello All,

I tried to run the lwip example application in Mac OS with the options as below, but I get a linker error “ip_data” symbol not found.

#define LWIP_IPV4 0

#define LWIP_IPV6 1

#define NO_SYS     1

However, if I enable LWIP_IPV4, the undefined symbol error doest appear.

Ip_data is defined in ip.c file, and ip.h file is included in ip6.c file. 

Has anyone come across this issue 

Undefined symbols for architecture x86_64:

  "_ip_data", referenced from:

      _ip6_input in liblwipcore.a(ip6.c.o)

      _ip6_input_accept in liblwipcore.a(ip6.c.o)

      _ip6_reass in liblwipcore.a(ip6_frag.c.o)

      _mld6_input in liblwipcore.a(mld6.c.o)

      _nd6_input in liblwipcore.a(nd6.c.o)

      _nd6_send_na in liblwipcore.a(nd6.c.o)

      _raw_input in liblwipcore.a(raw.c.o)

      ...

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

make[3]: *** [contrib/ports/unix/example_app/example_app] Error 1

make[2]: *** [contrib/ports/unix/example_app/CMakeFiles/example_app.dir/all] Error 2

make[1]: *** [contrib/ports/unix/example_app/CMakeFiles/example_app.dir/rule] Error 2

make: *** [example_app] Error 2

Regards

Arun