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abd7205115
This bug was spotted by GCC 14.1.0:
In file included from /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.h:27,
from /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-arsm.h:33,
from /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-6ln.h:30,
from /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c:28:
In function 'bf_isset',
inlined from '_build_ext_opts' at /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c:256:17,
inlined from '_snd_ra' at /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c:368:20,
inlined from '_snd_rtr_advs' at /home/maribu/Repos/software/RIOT/master/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c:99:9:
/home/maribu/Repos/software/RIOT/master/sys/include/bitfield.h:130:18: error: array subscript 0 is outside array bounds of 'uint8_t[0]' {aka 'unsigned char[]'} [-Werror=array-bounds=]
130 | return (field[idx / 8] & (1u << (7 - (idx % 8))));
| ~~~~~^~~~~~~~~
In function '_snd_rtr_advs':
cc1: note: source object is likely at address zero
cc1: all warnings being treated as errors
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