<net/sff8472.h>: Conditionally export table of ID names

Only export the array of ID names if either _WANT_SFF_8024_ID or
_WANT_SFF_8472_ID is defined.  Exporting them unconditionally can
trigger unused variable warnings if a consumer doesn't use the array.

Reviewed by:	olce, bz, brooks
Differential Revision:	https://reviews.freebsd.org/D49955

lib/libifconfig/libifconfig_sfp.c

@@ -24,6 +24,8 @@
  * SUCH DAMAGE.
  */
 
+#define _WANT_SFF_8024_ID
+
 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/ioctl.h>

sys/dev/mlx5/mlx5_core/mlx5_diagnostics.c

@@ -26,6 +26,8 @@
 #include "opt_rss.h"
 #include "opt_ratelimit.h"
 
+#define _WANT_SFF_8024_ID
+
 #include <dev/mlx5/driver.h>
 #include <dev/mlx5/port.h>
 #include <dev/mlx5/diagnostics.h>

sys/net/sff8472.h

@@ -415,6 +415,7 @@ enum {
 	SFF_8024_ID_LAST	= SFF_8024_ID_QSFP_CMIS
 };
 
+#if defined(_WANT_SFF_8024_ID) || defined(_WANT_SFF_8472_ID)
 static const char *sff_8024_id[SFF_8024_ID_LAST + 1] = {
 	"Unknown",
 	"GBIC",
@@ -448,6 +449,7 @@ static const char *sff_8024_id[SFF_8024_ID_LAST + 1] = {
 	"x8MiniLink",
 	"QSFP+(CIMS)"
 };
+#endif
 
 /* Keep compatibility with old definitions */
 #define	SFF_8472_ID_UNKNOWN	SFF_8024_ID_UNKNOWN

usr.sbin/cxgbetool/cxgbetool.c

@@ -25,6 +25,8 @@
  * SUCH DAMAGE.
  */
 
+#define _WANT_SFF_8472_ID
+
 #include <sys/param.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>