diff --git a/babeld/babeld.c b/babeld/babeld.c
index f995745e41..207c37d9b1 100644
--- a/babeld/babeld.c
+++ b/babeld/babeld.c
@@ -331,8 +331,8 @@ babel_main_loop(struct thread *thread)
         /* if there is no timeout, we must wait. */
         if(timeval_compare(&tv, &babel_now) > 0) {
             timeval_minus(&tv, &tv, &babel_now);
-            debugf(BABEL_DEBUG_TIMEOUT, "babel main loop : timeout: %ld msecs",
-                   tv.tv_sec * 1000 + tv.tv_usec / 1000);
+            debugf(BABEL_DEBUG_TIMEOUT, "babel main loop : timeout: %lld msecs",
+                   (long long)tv.tv_sec * 1000 + tv.tv_usec / 1000);
             /* it happens often to have less than 1 ms, it's bad. */
             timeval_add_msec(&tv, &tv, 300);
             babel_set_timer(&tv);
diff --git a/babeld/message.c b/babeld/message.c
index 5990373b69..e31d5de5df 100644
--- a/babeld/message.c
+++ b/babeld/message.c
@@ -391,7 +391,7 @@ parse_packet(const unsigned char *from, struct interface *ifp,
         } else if(type == MESSAGE_HELLO) {
             unsigned short seqno, interval;
             int changed;
-            unsigned int timestamp;
+            unsigned int timestamp = 0;
             DO_NTOHS(seqno, message + 4);
             DO_NTOHS(interval, message + 6);
             debugf(BABEL_DEBUG_COMMON,"Received hello %d (%d) from %s on %s.",
diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
index 324813c085..4dd38459f8 100644
--- a/bgpd/bgp_attr.h
+++ b/bgpd/bgp_attr.h
@@ -72,7 +72,7 @@ struct bgp_attr_encap_subtlv {
 	unsigned long refcnt;
 	uint16_t type;
 	uint16_t length;
-	uint8_t value[1]; /* will be extended */
+	uint8_t value[0]; /* will be extended */
 };
 
 #if ENABLE_BGP_VNC
diff --git a/isisd/isis_bpf.c b/isisd/isis_bpf.c
index 98f612f827..2c8b126088 100644
--- a/isisd/isis_bpf.c
+++ b/isisd/isis_bpf.c
@@ -48,14 +48,15 @@
 extern struct zebra_privs_t isisd_privs;
 
 struct bpf_insn llcfilter[] = {
-	BPF_STMT(BPF_LD + BPF_B + BPF_ABS,
-		 ETHER_HDR_LEN), /* check first byte */
+	/* check first byte */
+	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ETH_ALEN),
 	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ISO_SAP, 0, 5),
-	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ETHER_HDR_LEN + 1),
-	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ISO_SAP, 0,
-		 3), /* check second byte */
-	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ETHER_HDR_LEN + 2),
-	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x03, 0, 1), /* check third byte */
+	/* check second byte */
+	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ETH_ALEN + 1),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ISO_SAP, 0, 3),
+	/* check third byte */
+	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ETH_ALEN + 2),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x03, 0, 1),
 	BPF_STMT(BPF_RET + BPF_K, (u_int)-1),
 	BPF_STMT(BPF_RET + BPF_K, 0)};
 u_int readblen = 0;
@@ -243,15 +244,14 @@ int isis_recv_pdu_bcast(struct isis_circuit *circuit, u_char *ssnpa)
 
 	assert(bpf_hdr->bh_caplen == bpf_hdr->bh_datalen);
 
-	offset = bpf_hdr->bh_hdrlen + LLC_LEN + ETHER_HDR_LEN;
+	offset = bpf_hdr->bh_hdrlen + LLC_LEN + ETH_ALEN;
 
 	/* then we lose the BPF, LLC and ethernet headers */
 	stream_write(circuit->rcv_stream, readbuff + offset,
-		     bpf_hdr->bh_caplen - LLC_LEN - ETHER_HDR_LEN);
+		     bpf_hdr->bh_caplen - LLC_LEN - ETH_ALEN);
 	stream_set_getp(circuit->rcv_stream, 0);
 
-	memcpy(ssnpa, readbuff + bpf_hdr->bh_hdrlen + ETH_ALEN,
-	       ETH_ALEN);
+	memcpy(ssnpa, readbuff + bpf_hdr->bh_hdrlen + ETH_ALEN, ETH_ALEN);
 
 	if (ioctl(circuit->fd, BIOCFLUSH, &one) < 0)
 		zlog_warn("Flushing failed: %s", safe_strerror(errno));
@@ -265,7 +265,7 @@ int isis_send_pdu_bcast(struct isis_circuit *circuit, int level)
 	ssize_t written;
 	size_t buflen;
 
-	buflen = stream_get_endp(circuit->snd_stream) + LLC_LEN + ETHER_HDR_LEN;
+	buflen = stream_get_endp(circuit->snd_stream) + LLC_LEN + ETH_ALEN;
 	if (buflen > sizeof(sock_buff)) {
 		zlog_warn(
 			"isis_send_pdu_bcast: sock_buff size %zu is less than "
@@ -291,12 +291,12 @@ int isis_send_pdu_bcast(struct isis_circuit *circuit, int level)
 	/*
 	 * Then the LLC
 	 */
-	sock_buff[ETHER_HDR_LEN] = ISO_SAP;
-	sock_buff[ETHER_HDR_LEN + 1] = ISO_SAP;
-	sock_buff[ETHER_HDR_LEN + 2] = 0x03;
+	sock_buff[ETH_ALEN] = ISO_SAP;
+	sock_buff[ETH_ALEN + 1] = ISO_SAP;
+	sock_buff[ETH_ALEN + 2] = 0x03;
 
 	/* then we copy the data */
-	memcpy(sock_buff + (LLC_LEN + ETHER_HDR_LEN), circuit->snd_stream->data,
+	memcpy(sock_buff + (LLC_LEN + ETH_ALEN), circuit->snd_stream->data,
 	       stream_get_endp(circuit->snd_stream));
 
 	/* now we can send this */
diff --git a/isisd/isisd.c b/isisd/isisd.c
index f8a9df45c7..3d39a1ed52 100644
--- a/isisd/isisd.c
+++ b/isisd/isisd.c
@@ -1260,8 +1260,8 @@ DEFUN (show_isis_spf_ietf,
 			if (area->spf_timer[level - 1]) {
 				struct timeval remain = thread_timer_remain(
 					area->spf_timer[level - 1]);
-				vty_out(vty, "Pending, due in %ld msec\n",
-					remain.tv_sec * 1000
+				vty_out(vty, "Pending, due in %lld msec\n",
+					(long long)remain.tv_sec * 1000
 						+ remain.tv_usec / 1000);
 			} else {
 				vty_out(vty, "Not scheduled\n");
diff --git a/lib/module.c b/lib/module.c
index beef791093..b3ab91c4ea 100644
--- a/lib/module.c
+++ b/lib/module.c
@@ -42,8 +42,10 @@ static struct frrmod_info frrmod_default_info = {
 	.description = "libfrr core module",
 };
 union _frrmod_runtime_u frrmod_default = {
-	.r.info = &frrmod_default_info,
-	.r.finished_loading = 1,
+	.r = {
+		.info = &frrmod_default_info,
+		.finished_loading = 1,
+	},
 };
 
 // if defined(HAVE_SYS_WEAK_ALIAS_ATTRIBUTE)
diff --git a/lib/prefix.h b/lib/prefix.h
index eab4ac2bb7..a27f46ba0a 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -125,7 +125,7 @@ struct prefix {
 			struct in_addr adv_router;
 		} lp;
 		struct ethaddr prefix_eth; /* AF_ETHERNET */
-		u_char val[8];
+		u_char val[16];
 		uintptr_t ptr;
 		struct evpn_addr prefix_evpn; /* AF_EVPN */
 	} u __attribute__((aligned(8)));
diff --git a/lib/spf_backoff.c b/lib/spf_backoff.c
index d075e70d4e..92b7620eda 100644
--- a/lib/spf_backoff.c
+++ b/lib/spf_backoff.c
@@ -226,8 +226,9 @@ void spf_backoff_show(struct spf_backoff *backoff, struct vty *vty,
 	if (backoff->t_holddown) {
 		struct timeval remain =
 			thread_timer_remain(backoff->t_holddown);
-		vty_out(vty, "%s                   Still runs for %ld msec\n",
-			prefix, remain.tv_sec * 1000 + remain.tv_usec / 1000);
+		vty_out(vty, "%s                   Still runs for %lld msec\n",
+			prefix, (long long)remain.tv_sec * 1000
+				+ remain.tv_usec / 1000);
 	} else {
 		vty_out(vty, "%s                   Inactive\n", prefix);
 	}
@@ -237,8 +238,9 @@ void spf_backoff_show(struct spf_backoff *backoff, struct vty *vty,
 	if (backoff->t_timetolearn) {
 		struct timeval remain =
 			thread_timer_remain(backoff->t_timetolearn);
-		vty_out(vty, "%s                   Still runs for %ld msec\n",
-			prefix, remain.tv_sec * 1000 + remain.tv_usec / 1000);
+		vty_out(vty, "%s                   Still runs for %lld msec\n",
+			prefix, (long long)remain.tv_sec * 1000
+				+ remain.tv_usec / 1000);
 	} else {
 		vty_out(vty, "%s                   Inactive\n", prefix);
 	}
diff --git a/lib/termtable.c b/lib/termtable.c
index f7aec43118..ba85962cc9 100644
--- a/lib/termtable.c
+++ b/lib/termtable.c
@@ -31,48 +31,60 @@ struct ttable_style ttable_styles[] = {
 		.corner = '+',
 		.rownums_on = false,
 		.indent = 1,
-		.border.top = '-',
-		.border.bottom = '-',
-		.border.left = '|',
-		.border.right = '|',
-		.border.top_on = true,
-		.border.bottom_on = true,
-		.border.left_on = true,
-		.border.right_on = true,
-		.cell.lpad = 1,
-		.cell.rpad = 1,
-		.cell.align = LEFT,
-		.cell.border.bottom = '-',
-		.cell.border.bottom_on = true,
-		.cell.border.top = '-',
-		.cell.border.top_on = false,
-		.cell.border.right = '|',
-		.cell.border.right_on = true,
-		.cell.border.left = '|',
-		.cell.border.left_on = false,
+		.border = {
+			.top = '-',
+			.bottom = '-',
+			.left = '|',
+			.right = '|',
+			.top_on = true,
+			.bottom_on = true,
+			.left_on = true,
+			.right_on = true,
+		},
+		.cell = {
+			.lpad = 1,
+			.rpad = 1,
+			.align = LEFT,
+			.border = {
+				.bottom = '-',
+				.bottom_on = true,
+				.top = '-',
+				.top_on = false,
+				.right = '|',
+				.right_on = true,
+				.left = '|',
+				.left_on = false,
+			},
+		},
 	}, {	// blank, suitable for plaintext alignment
 		.corner = ' ',
 		.rownums_on = false,
 		.indent = 1,
-		.border.top = ' ',
-		.border.bottom = ' ',
-		.border.left = ' ',
-		.border.right = ' ',
-		.border.top_on = false,
-		.border.bottom_on = false,
-		.border.left_on = false,
-		.border.right_on = false,
-		.cell.lpad = 0,
-		.cell.rpad = 3,
-		.cell.align = LEFT,
-		.cell.border.bottom = ' ',
-		.cell.border.bottom_on = false,
-		.cell.border.top = ' ',
-		.cell.border.top_on = false,
-		.cell.border.right = ' ',
-		.cell.border.right_on = false,
-		.cell.border.left = ' ',
-		.cell.border.left_on = false,
+		.border = {
+			.top = ' ',
+			.bottom = ' ',
+			.left = ' ',
+			.right = ' ',
+			.top_on = false,
+			.bottom_on = false,
+			.left_on = false,
+			.right_on = false,
+		},
+		.cell = {
+			.lpad = 0,
+			.rpad = 3,
+			.align = LEFT,
+			.border = {
+				.bottom = ' ',
+				.bottom_on = false,
+				.top = ' ',
+				.top_on = false,
+				.right = ' ',
+				.right_on = false,
+				.left = ' ',
+				.left_on = false,
+			},
+		}
    }
 };
 /* clang-format on */
diff --git a/pimd/pim_join.c b/pimd/pim_join.c
index 9d65330e5f..4f5e534010 100644
--- a/pimd/pim_join.c
+++ b/pimd/pim_join.c
@@ -414,7 +414,7 @@ int pim_joinprune_send(struct pim_rpf *rpf, struct list *groups)
 	struct pim_jp_agg_group *group;
 	struct pim_interface *pim_ifp = NULL;
 	struct pim_jp_groups *grp = NULL;
-	struct pim_jp *msg;
+	struct pim_jp *msg = NULL;
 	struct listnode *node, *nnode;
 	uint8_t pim_msg[10000];
 	uint8_t *curr_ptr = pim_msg;
diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index 84d01bca6f..e2a1deb9ac 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -88,13 +88,10 @@ extern struct zebra_privs_t zserv_privs;
 #if !defined(ROUNDUP)
 
 /*
- * It's a bug for a platform not to define rounding/alignment for
- * sockaddrs on the routing socket.  This warning really is
- * intentional, to provoke filing bug reports with operating systems
- * that don't define RT_ROUNDUP or equivalent.
+ * If you're porting to a platform that changed RT_ROUNDUP but doesn't
+ * have it in its headers, this will break rather obviously and you'll
+ * have to fix it here.
  */
-#warning                                                                       \
-	"net/route.h does not define RT_ROUNDUP; making unwarranted assumptions!"
 
 /* OS X (Xcode as of 2014-12) is known not to define RT_ROUNDUP */
 #ifdef __APPLE__
diff --git a/zebra/zserv.c b/zebra/zserv.c
index 7899a8375c..0e0cc78bbe 100644
--- a/zebra/zserv.c
+++ b/zebra/zserv.c
@@ -1198,7 +1198,7 @@ static int zread_ipv4_add(struct zserv *client, u_short length,
 	ifindex_t ifindex;
 	safi_t safi;
 	int ret;
-	enum lsp_types_t label_type;
+	enum lsp_types_t label_type = ZEBRA_LSP_NONE;
 	mpls_label_t label;
 	struct nexthop *nexthop;