arm-linux-gnueabihf-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609

root@OpenWrt:/lib/modules/4.14.34# modprobe cfg80211.ko
   [   42.424100] cfg80211: Unknown symbol __put_net (err 0)
   1 module could not be probed
   - cfg80211

root@OpenWrt:/lib/modules/4.14.34# cat /proc/version
Linux version 4.14.34 (buildbot@crazyhorse)
(gcc version 7.3.0 (OpenWrt GCC 7.3.0 r6727-38bd4e4))
#0 SMP PREEMPT Thu Apr 19 17:15:00 2018