Added preprocessor checks and documentation to the bootloaders giving information about missing SIGNATURE_x defines due to outdated avr-libc versions.

Demos/Device/MassStorage/MassStorage.c

@@ -386,7 +386,7 @@ STREAM_CALLBACK(AbortOnMassStoreReset)
 /** ISR for the general Pipe/Endpoint interrupt vector. This ISR fires when a control request has been issued to the control endpoint,
  *  so that the request can be processed. As several elements of the Mass Storage implementation require asynchronous control requests
  *  (such as endpoint stall clearing and Mass Storage Reset requests during data transfers) this is done via interrupts rather than
- *  polling.
+ *  polling so that they can be processed regardless of the rest of the application's state.
  */
 ISR(ENDPOINT_PIPE_vect, ISR_BLOCK)
 {

Demos/Device/RNDISEthernet/RNDIS.h

@@ -55,10 +55,10 @@
 		#define REMOTE_NDIS_VERSION_MINOR             0x00
 	
 		/** RNDIS request to issue a host-to-device NDIS command */
-		#define SEND_ENCAPSULATED_COMMAND             0x00
+		#define REQ_SendEncapsulatedCommand           0x00
 
 		/** RNDIS request to issue a device-to-host NDIS response */
-		#define GET_ENCAPSULATED_RESPONSE             0x01
+		#define REQ_GetEncapsulatedResponse           0x01
 		
 	/* Enums: */
 		/** Enum for the possible NDIS adapter states. */

Demos/Device/RNDISEthernet/RNDISEthernet.c

@@ -158,7 +158,7 @@ EVENT_HANDLER(USB_UnhandledControlPacket)
 	/* Process RNDIS class commands */
 	switch (bRequest)
 	{
-		case SEND_ENCAPSULATED_COMMAND:
+		case REQ_SendEncapsulatedCommand:
 			if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				/* Clear the SETUP packet, ready for data transfer */
@@ -175,7 +175,7 @@ EVENT_HANDLER(USB_UnhandledControlPacket)
 			}
 			
 			break;
-		case GET_ENCAPSULATED_RESPONSE:
+		case REQ_GetEncapsulatedResponse:
 			if (bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 			{
 				/* Check if a response to the last message is ready */