NCS 3.4.0, (Ubuntu, nRF9160-DK)
Using cbprintf results in a linker error:
undefined reference to `cbprintf'
But I didn't find, how to enable it.
The zephyr samples doesn't contain it.
The nrf samples only use "vsnprintfcb", adding a few lines to use cbprintf just to test, if it links, fails with the same error message.
I tried to check the migration guides for nrf and zephyr, but I fail to see the guidance.
It's pretty easy to reproduce, e.g. "nrf/samples/cellular/udp":
src/main.c:
-------------------------------------
...
#include <nrf_modem_at.h>
#include <zephyr/sys/cbprintf.h>
...
static int out_func(int c, void *ctx)
{
ARG_UNUSED(ctx);
printk("%c", c);
return 0;
}
int main(void)
{
int err;
printk("UDP sample has started\n");
cbprintf(out_func, NULL, "cbprintf\n");
...
}
Build with:
west build -b nrf9160dk/nrf9160/ns
...
So, what is missing?
