Debugging with printf, openocd and semihosting on Workbench for STM32
Without "-specs=nosys.specs" same conflicts:
/../src/syscalls.c:80: multiple definition of `_kill'
/usr/lib/eclipse/plugins/fr.ac6.mcu.externaltools.arm-none.linux64_1.3.0.201507241112/tools/compiler/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7e-m/fpu/librdimon_nano.a(rdimon-_kill.o):_kill.c:(.text._kill+0x0): first defined here
same error for _exit, _close and other