Use the proper "-Wl,--undefined=BootloaderAPI_JumpTable" linker command line parameter in the bootloaders to ensure that the API jump tables are not discarded, rather than the previous C volatile pointer hack (thanks to Opendous Inc.).

Bootloaders/CDC/BootloaderAPI.h

@@ -43,9 +43,6 @@
 		
 		#include <LUFA/Common/Common.h>
 	
-	/* External Variables: */
-		extern uint8_t* BootloaderAPI_JumpTable;
-	
 	/* Function Prototypes: */
 		void    BootloaderAPI_ErasePage(uint32_t Address);
 		void    BootloaderAPI_WritePage(uint32_t Address);

Bootloaders/CDC/BootloaderCDC.c

@@ -63,10 +63,6 @@ static bool RunBootloader = true;
  */
 int main(void)
 {
-	/* Force a reference to the API jump table to prevent the linker from discarding it */
-	uint8_t* volatile Dummy = BootloaderAPI_JumpTable;
-	(void)Dummy;
-
 	/* Setup hardware required for the bootloader */
 	SetupHardware();
 

Bootloaders/CDC/makefile

@@ -340,7 +340,7 @@ EXTMEMOPTS =
 #    -Map:      create map file
 #    --cref:    add cross reference to  map file
 LDFLAGS  = -Wl,-Map=$(TARGET).map,--cref
-LDFLAGS += -Wl,--section-start=.text=$(BOOT_START) -Wl,--section-start=.apitable=$(BOOT_API_TABLESTART)
+LDFLAGS += -Wl,--section-start=.text=$(BOOT_START) -Wl,--section-start=.apitable=$(BOOT_API_TABLESTART) -Wl,--undefined=BootloaderAPI_JumpTable
 LDFLAGS += -Wl,--relax
 LDFLAGS += -Wl,--gc-sections
 LDFLAGS += $(EXTMEMOPTS)

Bootloaders/DFU/BootloaderAPI.h

@@ -43,9 +43,6 @@
 		
 		#include <LUFA/Common/Common.h>
 	
-	/* External Variables: */
-		extern uint8_t* BootloaderAPI_JumpTable;
-	
 	/* Function Prototypes: */
 		void    BootloaderAPI_ErasePage(uint32_t Address);
 		void    BootloaderAPI_WritePage(uint32_t Address);

Bootloaders/DFU/BootloaderDFU.c

@@ -99,10 +99,6 @@ static uint16_t EndAddr = 0x0000;
  */
 int main(void)
 {
-	/* Force a reference to the API jump table to prevent the linker from discarding it */
-	uint8_t* volatile Dummy = BootloaderAPI_JumpTable;
-	(void)Dummy;
-
 	/* Configure hardware required by the bootloader */
 	SetupHardware();
 

Bootloaders/DFU/makefile

@@ -335,7 +335,7 @@ EXTMEMOPTS =
 #    -Map:      create map file
 #    --cref:    add cross reference to  map file
 LDFLAGS  = -Wl,-Map=$(TARGET).map,--cref
-LDFLAGS += -Wl,--section-start=.text=$(BOOT_START) -Wl,--section-start=.apitable=$(BOOT_API_TABLESTART)
+LDFLAGS += -Wl,--section-start=.text=$(BOOT_START) -Wl,--section-start=.apitable=$(BOOT_API_TABLESTART) -Wl,--undefined=BootloaderAPI_JumpTable
 LDFLAGS += -Wl,--relax
 LDFLAGS += -Wl,--gc-sections
 LDFLAGS += $(EXTMEMOPTS)