<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11623#discussion_r325013443">sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c</a>:</p>
<pre style='color:#555'>>  static void _send_by_netif_hdr(gnrc_pktsnip_t *pkt)
 {
     assert(pkt->type == GNRC_NETTYPE_NETIF);
     gnrc_netif_t *netif = gnrc_netif_hdr_get_netif(pkt->data);
 
     _send_to_iface(netif, pkt);
 }
+#else   /* MODULE_GNRC_IPV6_EXT_FRAG */
+#define _fragment_pkt_if_needed(pkt, netif, from_me)    (false)
</pre>
<p>Binary does not change size at least on ARM platforms.</p>

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