Adding missing return statments and types to let things build on gcc 8.

Missing return values and return types keep daq from building on debian 10.

src/daqd/channel.hh

@@ -109,6 +109,7 @@ public:
      signal_slope = a.signal_slope;
      signal_offset = a.signal_offset;
      strcpy(signal_units, a.signal_units);
+     return *this;
   }
 };
 

src/daqd/daqd.cc

@@ -1827,6 +1827,7 @@ bool daqd_c::symm_ok() { return 1; }
 #endif
 #endif
 /// Server main function.
+int
 main (int argc, char *argv [])
 {
   int farg;
@@ -1992,6 +1993,7 @@ main (int argc, char *argv [])
 
   main_exit_status = 0;
   pthread_exit (&main_exit_status);
+  return 0;
 }
 
 /// Shutdown the daqd server, exit.

src/daqd/edcu.cc

@@ -79,6 +79,7 @@ edcu::edcu_main ()
                     (void *)&(daqd.edcu1.channel_value[i]), 0);
      }
      system_log(1, "EDCU has %d channels configured; first=%d\n", num_chans, fidx);
+     return (void*)0;
 }
 
 #endif /* if EPICS_EDCU != 1 */

src/daqd/epicsServer.cc

@@ -25,5 +25,6 @@ epicsServer::epics_main ()
     pCAS->setDebugLevel(0);
     system_log(1, "Epics server started");
     for(;!server_is_shutting_down;) fileDescriptorManager.process(1000.0);
+    return (void*)0;
 }
 

src/daqd/producer.hh

@@ -40,7 +40,7 @@ public:
   static void *frame_writer_crc_static (void *a) { return ((producer *)a) -> frame_writer_crc();}
   void *grabIfoData (int, int, unsigned char *);
   void grabIfoDataThread (void);
-  static void *grabIfoData_static(void *a) { ((producer *)a) -> grabIfoDataThread();};
+  static void *grabIfoData_static(void *a) { ((producer *)a) -> grabIfoDataThread(); return (void*)0; };
 
   pthread_t tid;
   pthread_t tid1; ///< Parallel producer thread

src/drv/param.c

@@ -121,8 +121,8 @@ parseConfigFile(char *fname, unsigned long *crc,
 		int (*callback)(char *channel_name, struct CHAN_PARAM *params, void *user),
 		int testpoint, char *arch_file, void *user)
 {
-  unsigned long crc_ptr(char* cp, unsigned int bytes, unsigned int crc);
-  unsigned long crc_len(unsigned int bytes, unsigned int crc);
+  unsigned int crc_ptr(char* cp, unsigned int bytes, unsigned int crc);
+  unsigned long crc_int(unsigned int bytes, unsigned int crc);
 
   CHAN_PARAM deflt;
   CHAN_PARAM current;