Re: [lwip-devel] Lwip linker error in Mac

[address@hidden]

Am 10.02.2021 um 20:53 schrieb Arun via lwip-devel:
> 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 ?

I'm not aware of any reports like this. How did you compile the sources?
Using the existing CMake files? I'm not sure these have been used for
IPv6-only yet. What I can tell for sure is that with the Win32 VS
project, compiling for IPv6-only works (or worked last time I did that).

Regards,
Simon

>
>
> 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
>
>
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