uboot-lantiq: fix compatibility with gcc7

Backport u-boot commit 704f3acfcf55343043bbed01c5fb0a0094a68e8a to fix
compatibility with gcc7.

Signed-off-by: Martin Schiller <[email protected]>

package/boot/uboot-lantiq/patches/0029-net-Use_packed_structures-for_networking.patch

@@ -0,0 +1,142 @@
+From 704f3acfcf55343043bbed01c5fb0a0094a68e8a Mon Sep 17 00:00:00 2001
+From: Denis Pynkin <[email protected]>
+Date: Fri, 21 Jul 2017 19:28:42 +0300
+Subject: [PATCH] net: Use packed structures for networking
+
+PXE boot is broken with GCC 7.1 due option '-fstore-merging' enabled
+by default for '-O2':
+
+BOOTP broadcast 1
+data abort
+pc : [<8ff8bb30>]          lr : [<00004f1f>]
+reloc pc : [<17832b30>]    lr : [<878abf1f>]
+sp : 8f558bc0  ip : 00000000     fp : 8ffef5a4
+r10: 8ffed248  r9 : 8f558ee0     r8 : 8ffef594
+r7 : 0000000e  r6 : 8ffed700     r5 : 00000000  r4 : 8ffed74e
+r3 : 00060101  r2 : 8ffed230     r1 : 8ffed706  r0 : 00000ddd
+Flags: nzcv  IRQs off  FIQs off  Mode SVC_32
+Resetting CPU ...
+
+Core reason is usage of structures for network headers without packed
+attribute.
+
+Reviewed-by: Yauheni Kaliuta <[email protected]>
+Signed-off-by: Denis Pynkin <[email protected]>
+Acked-by: Joe Hershberger <[email protected]>
+---
+ include/net.h | 14 +++++++-------
+ net/bootp.h   |  2 +-
+ net/dns.h     |  2 +-
+ net/nfs.h     |  2 +-
+ net/sntp.h    |  2 +-
+ 5 files changed, 11 insertions(+), 11 deletions(-)
+
+--- a/include/net.h
++++ b/include/net.h
+@@ -203,7 +203,7 @@ struct ethernet_hdr {
+ 	uchar		et_dest[6];	/* Destination node		*/
+ 	uchar		et_src[6];	/* Source node			*/
+ 	ushort		et_protlen;	/* Protocol or length		*/
+-};
++} __attribute__((packed));
+ 
+ /* Ethernet header size */
+ #define ETHER_HDR_SIZE	(sizeof(struct ethernet_hdr))
+@@ -219,7 +219,7 @@ struct e802_hdr {
+ 	uchar		et_snap2;
+ 	uchar		et_snap3;
+ 	ushort		et_prot;	/* 802 protocol			*/
+-};
++} __attribute__((packed));
+ 
+ /* 802 + SNAP + ethernet header size */
+ #define E802_HDR_SIZE	(sizeof(struct e802_hdr))
+@@ -233,7 +233,7 @@ struct vlan_ethernet_hdr {
+ 	ushort		vet_vlan_type;	/* PROT_VLAN			*/
+ 	ushort		vet_tag;	/* TAG of VLAN			*/
+ 	ushort		vet_type;	/* protocol type		*/
+-};
++} __attribute__((packed));
+ 
+ /* VLAN Ethernet header size */
+ #define VLAN_ETHER_HDR_SIZE	(sizeof(struct vlan_ethernet_hdr))
+@@ -260,7 +260,7 @@ struct ip_hdr {
+ 	ushort		ip_sum;		/* checksum			*/
+ 	IPaddr_t	ip_src;		/* Source IP address		*/
+ 	IPaddr_t	ip_dst;		/* Destination IP address	*/
+-};
++} __attribute__((packed));
+ 
+ #define IP_OFFS		0x1fff /* ip offset *= 8 */
+ #define IP_FLAGS	0xe000 /* first 3 bits */
+@@ -288,7 +288,7 @@ struct ip_udp_hdr {
+ 	ushort		udp_dst;	/* UDP destination port		*/
+ 	ushort		udp_len;	/* Length of UDP packet		*/
+ 	ushort		udp_xsum;	/* Checksum			*/
+-};
++} __attribute__((packed));
+ 
+ #define IP_UDP_HDR_SIZE		(sizeof(struct ip_udp_hdr))
+ #define UDP_HDR_SIZE		(IP_UDP_HDR_SIZE - IP_HDR_SIZE)
+@@ -327,7 +327,7 @@ struct arp_hdr {
+ 	uchar		ar_tha[];	/* Target hardware address	*/
+ 	uchar		ar_tpa[];	/* Target protocol address	*/
+ #endif /* 0 */
+-};
++} __attribute__((packed));
+ 
+ #define ARP_HDR_SIZE	(8+20)		/* Size assuming ethernet	*/
+ 
+@@ -362,7 +362,7 @@ struct icmp_hdr {
+ 		} frag;
+ 		uchar data[0];
+ 	} un;
+-};
++} __attribute__((packed));
+ 
+ #define ICMP_HDR_SIZE		(sizeof(struct icmp_hdr))
+ #define IP_ICMP_HDR_SIZE	(IP_HDR_SIZE + ICMP_HDR_SIZE)
+--- a/net/bootp.h
++++ b/net/bootp.h
+@@ -49,7 +49,7 @@ struct Bootp_t {
+ 	char		bp_sname[64];	/* Server host name		*/
+ 	char		bp_file[128];	/* Boot file name		*/
+ 	char		bp_vend[OPT_FIELD_SIZE]; /* Vendor information	*/
+-};
++} __attribute__((packed));
+ 
+ #define BOOTP_HDR_SIZE	sizeof(struct Bootp_t)
+ 
+--- a/net/dns.h
++++ b/net/dns.h
+@@ -29,7 +29,7 @@ struct header {
+ 	uint16_t	nauth;		/* Authority PRs */
+ 	uint16_t	nother;		/* Other PRs */
+ 	unsigned char	data[1];	/* Data, variable length */
+-};
++} __attribute__((packed));
+ 
+ extern void DnsStart(void);		/* Begin DNS */
+ 
+--- a/net/sntp.h
++++ b/net/sntp.h
+@@ -51,7 +51,7 @@ struct sntp_pkt_t {
+ 	unsigned long long originate_timestamp;
+ 	unsigned long long receive_timestamp;
+ 	unsigned long long transmit_timestamp;
+-};
++} __attribute__((packed));
+ 
+ extern void SntpStart(void);	/* Begin SNTP */
+ 
+--- a/net/nfs.h
++++ b/net/nfs.h
+@@ -68,7 +68,7 @@ struct rpc_t {
+ 			uint32_t data[19];
+ 		} reply;
+ 	} u;
+-};
++} __attribute__((packed));
+ extern void NfsStart(void);	/* Begin NFS */
+ 
+