[dpdk-dev] [PATCH v3] net/mlx5: fix compilation issue with gcc pragma

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

The GCC compiler might generate warning or error if
format parameter of fscanf is not literal. This was
suppressed with GCC specific pragms. Some compilers
(i.e Intel icc) do not recognize GCC diagnostic
pragma, so the code was refactored with stringification,
pragmas are not needed anymore.

Fixes: a46a42b5cd03 ("net/mlx5: add VF LAG mode bonding device recognition")

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 v3: replace with RTE_STR stringifier

 v2: http://patches.dpdk.org/patch/60415/
     code rewritten with stringification

 v1: http://patches.dpdk.org/patch/60310/
     initial version with pragmas and compiler type check

 drivers/net/mlx5/mlx5.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 951b9f5..13d112e 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -2295,12 +2295,9 @@ struct mlx5_dev_spawn_data {
 	}
 	if (!file)
 		return -1;
-	MKSTR(format, "%c%us", '%', (unsigned int)(sizeof(ifname) - 1));
-
 	/* Use safe format to check maximal buffer length. */
-#pragma GCC diagnostic ignored "-Wformat-nonliteral"
-	while (fscanf(file, format, ifname) == 1) {
-#pragma GCC diagnostic error "-Wformat-nonliteral"
+	assert(atol(RTE_STR(IF_NAMESIZE)) == IF_NAMESIZE);
+	while (fscanf(file, "%" RTE_STR(IF_NAMESIZE) "s", ifname) == 1) {
 		char tmp_str[IF_NAMESIZE + 32];
 		struct rte_pci_addr pci_addr;
 		struct mlx5_switch_info	info;
-- 
1.8.3.1