| Hi Simon, I used the CMake system for building. Everything was going well till I disabled IPv4 and enabled only IPv6.
My colleague faced the same problem in Mac. He moved to Linux and it worked.
I believe this is something specific to Mac.
Regards Arun Mahasenan
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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