Fix various compiler warnings for combinations of undefined USE_ features

src/main/fc/fc_core.c

@@ -558,7 +558,9 @@ bool isAirmodeActivated()
 bool processRx(timeUs_t currentTimeUs)
 {
     static bool armedBeeperOn = false;
+#ifdef USE_TELEMETRY
     static bool sharedPortTelemetryEnabled = false;
+#endif
 
     if (!calculateRxChannelsAndUpdateFailsafe(currentTimeUs)) {
         return false;

src/main/rx/fport.c

@@ -25,7 +25,7 @@
 
 #include "platform.h"
 
-#if defined(USE_SERIAL_RX)
+#if defined(USE_SERIAL_RX) && defined(USE_SERIALRX_FPORT)
 
 #include "build/debug.h"
 
@@ -114,7 +114,9 @@ typedef struct fportFrame_s {
     fportData_t data;
 } fportFrame_t;
 
+#ifdef USE_TELEMETRY_SMARTPORT
 static const smartPortPayload_t emptySmartPortFrame = { .frameId = 0, .valueId = 0, .data = 0 };
+#endif
 
 #define FPORT_REQUEST_FRAME_LENGTH sizeof(fportFrame_t)
 #define FPORT_RESPONSE_FRAME_LENGTH (sizeof(uint8_t) + sizeof(smartPortPayload_t))
@@ -144,7 +146,9 @@ static smartPortPayload_t *mspPayload = NULL;
 static timeUs_t lastRcFrameReceivedMs = 0;
 
 static serialPort_t *fportPort;
+#ifdef USE_TELEMETRY_SMARTPORT
 static bool telemetryEnabled = false;
+#endif
 
 static void reportFrameError(uint8_t errorReason) {
     static volatile uint16_t frameErrors = 0;
@@ -248,7 +252,9 @@ static bool checkChecksum(uint8_t *data, uint8_t length)
 
 static uint8_t fportFrameStatus(rxRuntimeConfig_t *rxRuntimeConfig)
 {
+#ifdef USE_TELEMETRY_SMARTPORT
     static smartPortPayload_t payloadBuffer;
+#endif
     static bool hasTelemetryRequest = false;
 
     uint8_t result = RX_FRAME_PENDING;

src/main/target/common_fc_post.h

@@ -56,6 +56,16 @@
 #endif
 #endif
 
+#if !defined(USE_TELEMETRY)
+#undef USE_TELEMETRY_FRSKY_HUB
+#undef USE_TELEMETRY_HOTT
+#undef USE_TELEMETRY_LTM
+#undef USE_TELEMETRY_SMARTPORT
+#undef USE_TELEMETRY_CRSF
+#undef USE_TELEMETRY_SRXL
+#undef USE_SERIALRX_FPORT
+#endif
+
 #if defined(USE_MSP_OVER_TELEMETRY)
 #if !defined(USE_TELEMETRY_SMARTPORT) && !defined(USE_TELEMETRY_CRSF)
 #undef USE_MSP_OVER_TELEMETRY

src/main/telemetry/smartport.c

@@ -472,6 +472,8 @@ void processSmartPortTelemetry(smartPortPayload_t *payload, volatile bool *clear
          uint8_t *frameStart = (uint8_t *)&payload->valueId;
          smartPortMspReplyPending = handleMspFrame(frameStart, SMARTPORT_MSP_PAYLOAD_SIZE);
     }
+#else
+    UNUSED(payload);
 #endif
 
     bool doRun = true;