Fixed build for gcc 8 (SITL).

lib/main/dyad/dyad.c

@@ -5,6 +5,12 @@
  * under the terms of the MIT license. See LICENSE for details.
  */
 
+#if __GNUC__ > 6
+#define FALLTHROUGH __attribute__ ((fallthrough))
+#else
+#define FALLTHROUGH do {} while(0)
+#endif
+
 #ifdef _WIN32
   #define _WIN32_WINNT 0x501
   #ifndef _CRT_SECURE_NO_WARNINGS
@@ -741,8 +747,8 @@ void dyad_update(void) {
             break;
           }
         }
-        /* Fall through */
 
+	FALLTHROUGH;
       case DYAD_STATE_CLOSING:
         if (select_has(&dyad_selectSet, SELECT_WRITE, stream->sockfd)) {
           stream_flushWriteBuffer(stream);

src/main/pg/pg.h

@@ -134,7 +134,7 @@ extern const uint8_t __pg_resetdata_end[];
 
 #define PG_REGISTER_WITH_RESET_FN(_type, _name, _pgn, _version)         \
     extern void pgResetFn_ ## _name(_type *);                           \
-    PG_REGISTER_I(_type, _name, _pgn, _version, .reset = {.fn = (pgResetFunc*)&pgResetFn_ ## _name }) \
+    PG_REGISTER_I(_type, _name, _pgn, _version, .reset = {.fn = (pgResetFunc*)(void (*)())&pgResetFn_ ## _name }) \
     /**/
 
 #define PG_REGISTER_WITH_RESET_TEMPLATE(_type, _name, _pgn, _version)   \
@@ -163,7 +163,7 @@ extern const uint8_t __pg_resetdata_end[];
 
 #define PG_REGISTER_ARRAY_WITH_RESET_FN(_type, _size, _name, _pgn, _version) \
     extern void pgResetFn_ ## _name(_type *);    \
-    PG_REGISTER_ARRAY_I(_type, _size, _name, _pgn, _version, .reset = {.fn = (pgResetFunc*)&pgResetFn_ ## _name}) \
+    PG_REGISTER_ARRAY_I(_type, _size, _name, _pgn, _version, .reset = {.fn = (pgResetFunc*)(void (*)())&pgResetFn_ ## _name}) \
     /**/
 
 #if 0

src/main/rx/rx.c

@@ -476,8 +476,8 @@ static uint16_t getRxfailValue(uint8_t channel)
                 return rxConfig()->rx_min_usec;
             }
         }
-        /* no break */
 
+	FALLTHROUGH;
     default:
     case RX_FAILSAFE_MODE_INVALID:
     case RX_FAILSAFE_MODE_HOLD: