Fix sb_counters declaration.

src/sb_counter.c

@@ -25,6 +25,8 @@
 #include "sb_util.h"
 #include "sb_ck_pr.h"
 
+sb_counters_t *sb_counters CK_CC_CACHELINE;
+
 static sb_counters_t last_intermediate_counters;
 static sb_counters_t last_cumulative_counters;
 

src/sb_counter.h

@@ -50,7 +50,7 @@ typedef uint64_t
 sb_counters_t[SB_ALIGN(SB_CNT_MAX * sizeof(uint64_t), CK_MD_CACHELINE) /
               sizeof(uint64_t)];
 
-sb_counters_t *sb_counters CK_CC_CACHELINE;
+extern sb_counters_t *sb_counters;
 
 int sb_counters_init(void);