about the link error with arm-none-eabi on the eclipse environment.

[neweins]

Hello all

I'm struggling with link errors, "undefined referencce atan2" as well as all math library. I still dont know why it is occurred these errors. I configured the eclipse compile environment with the gnu arm tool using your doc, application note ver1.2. May you help me?

[Markus Roppelt]

I can compile the attached math-lib.zip. However if I change the the argument to a variable I get following error.

main.c:(.text.startup+0x5a): undefined reference to `atan2'
collect2.exe: error: ld returned 1 exit status
make: *** [_build/template_project_gcc_s110_xxaa.out] Fehler 1

My main is:

int main(void)
{	
	uint8_t idx = 0;
	double d_idx = 0.0;
	uint8_t buffer[20];
	simple_uart_config(0, 17, 0, 16, false);
	simple_uart_putstring((uint8_t *)"Start\r\n");
	nrf_gpio_range_cfg_output(8, 15);
	
	while (true)
    {
		idx++;
		d_idx = (double) idx;
		float result = atan2(1.0, d_idx);
		sprintf((char *)buffer, "%f\r\n", result);
		simple_uart_putstring(buffer);
		nrf_delay_us(100000);
    }
}

How can I build this?

Greetings Markus