Undefined reference to __mulhi3 when using sprintf() - AVR GCC in Code::Blocks on Windows

Question

I am using Code::Blocks with AVR-GCC toolchain from Microchip (Atmel). I am trying to compile program for Atmega32. I get "Undefined reference to __mulhi3" when I try to compile program that uses sprintf() function. Without this function I get no error. The same program compiled in Atmel Studio or in Code::Blocks under Linux works fine.

#include <avr/io.h>
#include <stdio.h>

int main(void)
{
    char buf[20];
    sprintf(buf, "Hello %d", 1);

    while(1);
    return 0;
}

Answer 1

Problem is caused by default settings of Code::Blocks for GNU GCC Compiler for AVR - there are unnecessary include paths to C:/WinAVR/avr/lib. You should go to

Settings → Compiler... → GNU GCC Compiler for AVR → Search directiories → Linker

and clear list of include paths. If the list is not empty, linker tries to link against wrong version of library.