net/mlx: fix build with clang 9

[dpdk.git] / drivers / net / mlx4 / mlx4_utils.h

diff --git a/drivers/net/mlx4/mlx4_utils.h b/drivers/net/mlx4/mlx4_utils.h
index 74b9d2e..5718b9c 100644 (file)
--- a/drivers/net/mlx4/mlx4_utils.h
+++ b/drivers/net/mlx4/mlx4_utils.h
@@ -79,9 +79,10 @@ pmd_drv_log_basename(const char *s)
 
 /** Allocate a buffer on the stack and fill it with a printf format string. */
 #define MKSTR(name, ...) \
-       char name[snprintf(NULL, 0, __VA_ARGS__) + 1]; \
+       int mkstr_size_##name = snprintf(NULL, 0, "" __VA_ARGS__); \
+       char name[mkstr_size_##name + 1]; \
        \
-       snprintf(name, sizeof(name), __VA_ARGS__)
+       snprintf(name, sizeof(name), "" __VA_ARGS__)
 
 /** Generate a string out of the provided arguments. */
 #define MLX4_STR(...) # __VA_ARGS__