fix to MAKE on GCC 10+ (worked on RHEL 9 using GCC 11). Thanks to Net…

…flix#775

src/dyn_ring_queue.c

@@ -11,6 +11,9 @@
 #include "dyn_gossip.h"
 #include "dyn_token.h"
 
+_C2G_InQ C2G_InQ = {};
+_C2G_OutQ C2G_OutQ = {};
+
 // should use pooling to store struct ring_message so that we can reuse
 struct ring_msg *create_ring_msg(void) {
   struct ring_msg *msg = dn_alloc(sizeof(*msg));

src/dyn_ring_queue.h

@@ -16,17 +16,20 @@ struct gossip_node;
 typedef rstatus_t (*callback_t)(void *msg);
 typedef void (*data_func_t)(void *);
 
-volatile struct {
+typedef volatile struct {
   long m_getIdx;
   long m_putIdx;
   void *m_entry[C2G_InQ_SIZE];
-} C2G_InQ;
+} _C2G_InQ;
 
-volatile struct {
+typedef volatile struct {
   long m_getIdx;
   long m_putIdx;
   void *m_entry[C2G_OutQ_SIZE];
-} C2G_OutQ;
+} _C2G_OutQ;
+
+extern _C2G_InQ C2G_InQ;
+extern _C2G_OutQ C2G_OutQ;
 
 struct ring_msg {
   callback_t cb;