[dpdk-dev] [PATCH] mlx4: fix unneeded function error with clang v3.6

[Bruce Richardson <bruce.richardson@intel.com>]

When compiling with clang 3.6, the mlx4 driver gives the following error
message about an unneeded function.

  CC mlx4.o
.../drivers/net/mlx4/mlx4.c:136:20: fatal error: function
      'wr_id_t_check' is not needed and will not be emitted
[-Wunneeded-internal-declaration]
static inline void wr_id_t_check(void)
                   ^
1 error generated.

The function is to compile-time check the size of wr_id_t, so use
the standard DPDK BUILD_BUG_ON macro to do so in the init function
instead.

Fixes: 7fae69eeff13 ("mlx4: new poll mode driver")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 drivers/net/mlx4/mlx4.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 207bfe2..ac162e9 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -132,15 +132,6 @@ typedef union {
 
 #define WR_ID(o) (((wr_id_t *)&(o))->data)
 
-/* Compile-time check. */
-static inline void wr_id_t_check(void)
-{
-	wr_id_t check[1 + (2 * -!(sizeof(wr_id_t) == sizeof(uint64_t)))];
-
-	(void)check;
-	(void)wr_id_t_check;
-}
-
 /* Transpose flags. Useful to convert IBV to DPDK flags. */
 #define TRANSPOSE(val, from, to) \
 	(((from) >= (to)) ? \
@@ -5685,6 +5676,8 @@ rte_mlx4_pmd_init(const char *name, const char *args)
 {
 	(void)name;
 	(void)args;
+
+	RTE_BUILD_BUG_ON(sizeof(wr_id_t) != sizeof(uint64_t));
 	/*
 	 * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
 	 * huge pages. Calling ibv_fork_init() during init allows
-- 
2.5.0