fix compilation with gcc-11
/usr/lib/gcc/arm-none-eabi/11.3.1/../../../arm-none-eabi/bin/ld: cuart_driver_asf4_usart_async.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: multiple definition of `dma_m2m_complete_flag'; atmel_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: first defined here
/usr/lib/gcc/arm-none-eabi/11.3.1/../../../arm-none-eabi/bin/ld: command.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: multiple definition of `dma_m2m_complete_flag'; atmel_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: first defined here
/usr/lib/gcc/arm-none-eabi/11.3.1/../../../arm-none-eabi/bin/ld: main.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: multiple definition of `dma_m2m_complete_flag'; atmel_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: first defined here
/usr/lib/gcc/arm-none-eabi/11.3.1/../../../arm-none-eabi/bin/ld: stdio_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: multiple definition of `dma_m2m_complete_flag'; atmel_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: first defined here
/usr/lib/gcc/arm-none-eabi/11.3.1/../../../arm-none-eabi/bin/ld: usb_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: multiple definition of `dma_m2m_complete_flag'; atmel_start.o:/space/home/laforge/projects/git/osmo-ccid-firmware/sysmoOCTSIM/gcc/../atmel_start.h:15: first defined here
Change-Id: I9a72dc0101de84ce39530c1503b32620b4777b4a
diff --git a/sysmoOCTSIM/atmel_start.h b/sysmoOCTSIM/atmel_start.h
index 4892cbd..fb1e18f 100644
--- a/sysmoOCTSIM/atmel_start.h
+++ b/sysmoOCTSIM/atmel_start.h
@@ -12,7 +12,7 @@
#include "stdio_start.h"
/** flag set when the memory to memory DMA is complete */
-volatile bool dma_m2m_complete_flag;
+extern volatile bool dma_m2m_complete_flag;
/**
* Initializes MCU, drivers and middleware in the project