[PATCH v6 23/30] examples/ptpclient: replace packed attributes

[Andre Muezerie <andremue@linux.microsoft.com>]

MSVC struct packing is not compatible with GCC. Replace macro
__rte_packed with __rte_packed_begin to push existing pack value
and set packing to 1-byte and macro __rte_packed_end to restore
the pack value prior to the push.

Macro __rte_packed_end is deliberately utilized to trigger a
MSVC compiler warning if no existing packing has been pushed allowing
easy identification of locations where the __rte_packed_begin is
missing.

Signed-off-by: Andre Muezerie <andremue@linux.microsoft.com>
---
 examples/ptpclient/ptpclient.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/examples/ptpclient/ptpclient.c b/examples/ptpclient/ptpclient.c
index 23fa487081..5486a87119 100644
--- a/examples/ptpclient/ptpclient.c
+++ b/examples/ptpclient/ptpclient.c
@@ -85,21 +85,24 @@ static const struct rte_ether_addr ether_multicast = {
 };
 
 /* Structs used for PTP handling. */
+__rte_packed_begin
 struct tstamp {
 	uint16_t   sec_msb;
 	uint32_t   sec_lsb;
 	uint32_t   ns;
-}  __rte_packed;
+}  __rte_packed_end;
 
 struct clock_id {
 	uint8_t id[8];
 };
 
+__rte_packed_begin
 struct port_id {
 	struct clock_id        clock_id;
 	uint16_t               port_number;
-}  __rte_packed;
+}  __rte_packed_end;
 
+__rte_packed_begin
 struct ptp_header {
 	uint8_t              msg_type;
 	uint8_t              ver;
@@ -113,39 +116,44 @@ struct ptp_header {
 	uint16_t             seq_id;
 	uint8_t              control;
 	int8_t               log_message_interval;
-} __rte_packed;
+} __rte_packed_end;
 
+__rte_packed_begin
 struct sync_msg {
 	struct ptp_header   hdr;
 	struct tstamp       origin_tstamp;
-} __rte_packed;
+} __rte_packed_end;
 
+__rte_packed_begin
 struct follow_up_msg {
 	struct ptp_header   hdr;
 	struct tstamp       precise_origin_tstamp;
 	uint8_t             suffix[];
-} __rte_packed;
+} __rte_packed_end;
 
+__rte_packed_begin
 struct delay_req_msg {
 	struct ptp_header   hdr;
 	struct tstamp       origin_tstamp;
-} __rte_packed;
+} __rte_packed_end;
 
+__rte_packed_begin
 struct delay_resp_msg {
 	struct ptp_header    hdr;
 	struct tstamp        rx_tstamp;
 	struct port_id       req_port_id;
 	uint8_t              suffix[];
-} __rte_packed;
+} __rte_packed_end;
 
 struct ptp_message {
+	__rte_packed_begin
 	union {
 		struct ptp_header          header;
 		struct sync_msg            sync;
 		struct delay_req_msg       delay_req;
 		struct follow_up_msg       follow_up;
 		struct delay_resp_msg      delay_resp;
-	} __rte_packed;
+	} __rte_packed_end;
 };
 
 struct ptpv2_time_receiver_ordinary {
-- 
2.34.1