Hi, I’m trying to compile FreeRTOS 5.3.0 STM32 Primer example (unmodified). RIDE and development environment is fresh and clear: Ride7 7.20.09.0139 Rkit-ARM 1.20.09.0153 Everything compile fine, except linking: Running: LD "C:RaisonanceRidearm-gccbinarm-none-eabi-gcc.exe" -mcpu=cortex-m3 -mthumb -Wl,-T -Xlinker "C:workFreeRTOSDemoCORTEX_STM32F103_Primer_GCCRTOSDemo.elf.ld" -u _start -Wl,-static -Wl,–gc-sections -nostartfiles -Wl,-Map -Xlinker "C:workFreeRTOSDemoCORTEX_STM32F103_Primer_GCCRTOSDemo.map"   C:RaisonanceRideLibARMSTM32x_io_putchar_thumb.a(STM32F10X_IO_putchar.o): In function `putchar’:  STM32F10X_IO_putchar.c:(.text.putchar+0x0): multiple definition of `putchar’  c:/raisonance/ride/arm-gcc/bin/../lib/gcc/arm-none-eabi/4.3.2/../../../../arm-none-eabi/lib/thumb2libc.a(lib_a-putchar.o):putchar.c:(.text+0x0): first defined here  collect2: ld returned 1 exit status The I have no idea how to prevent linker from linking libc putchar, any ideas? Regards, Andriy

The error is telling you where to two definitions are.  One is in the libc library, and the other in STM32F10X_IO_putchar.c – so you need to either remove the .c file from the build or not use the library.  I suspect this is a compiler or link option setting problem and must be caused by a different Ride version to the one used to create the demo. Regards.

Thanks, it’s exactly I supposed. The problem that I have no idea how to avoid linking libc – it’s linked automatically. And worse, I want libc – there are many useful function there. And the goal is to use both – putchar from STM32F10X_IO_putchar.c and libc for the rest. Any ideas? Maybe I’m wrong somewhere? regards, Andriy