编译树莓派3的提示 multiple definition of 'clear'

build/kernel/components/finsh/cmd.o: In function `clear':
/root/rt-thread/components/finsh/cmd.c:53: multiple definition of `clear'
build/driver/drv_fb.o:/root/rt-thread/bsp/raspberry-pi/raspi3-32/driver/drv_fb.c:209: first defined here
collect2: error: ld returned 1 exit status
scons: *** [rtthread.elf] Error 1
scons: building terminated because of errors.

long clear(void)
{
    rt_kprintf("\x1b[2J\x1b[H");
    return 0;
}

void clear(fb_t *fb, const uint32_t color)
{
    uint32_t *addr = (uint32_t*) fb->addr;
    uint32_t i;
    for (i = 0; i < (fb->height * fb->width); i++)
    {
        *addr++ = color;
    }
    fb->x = 0;
    fb->y = 0;
}