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_start not found

Using eclipse and code sorcery compiler I got an undefined label error, see below [b]_build/gcc_startup_nrf51.o: In function Reset_Handler': /home/oscar/workspace/Nordic/nrf51822/Source/templates/gcc/gcc_startup_nrf51.s:150: undefined reference to_start'[/b] "/opt/arm-2013.05/bin/arm-none-eabi-gcc" -DNRF51822_QFAA_CA -mcpu=cortex-m0 -mthumb -mabi=aapcs -DNRF51 -DBOARD_NRF6310 -DNRF51822_QFAA_CA --std=gnu99 -Wall -Werror -mfloat-abi=soft -DDEBUG -g3 -O0 -I"/home/oscar/workspace/Nordic/nrf51822/Include/ble" -I"/home/oscar/workspace/Nordic/nrf51822/Include/ble/softdevice" -I"/home/oscar/workspace/Nordic/nrf51822/Include/app_common" -I"/home/oscar/workspace/Nordic/nrf51822/Include/ble/ble_services" -I"../" -I"/home/oscar/workspace/Nordic/nrf51822/Include" -I"/home/oscar/workspace/Nordic/nrf51822/Include/gcc" -I"/home/oscar/workspace/Nordic/nrf51822/Include/ext_sensors" -M /home/oscar/workspace/Nordic/nrf51822/Source/ble/ble_services/ble_srv_common.c -MF "_build/ble_srv_common.d" -MT _build/ble_srv_common.o [b]collect2: error: ld returned 1 exit status make: *** [_build/ble_hrs_gcc_s110_xxaa.out] Error 1[/b] Where is the _start defined?
Any help?

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