Unidentified reference of nRF Connect SDK to nRFX_timer_*

[KeilyMorrison]

Am focused on building a UART async api support by making an addition of:

CONFIG_SERIAL=y

CONFIG_UART_ASYNC_API=y

 to my prj.conf.  Without CONFIG_UART_ASYNC_API the app compiles, but uart_callback_set fails (as expected).  When I add CONFIG_UART_ASYNC_API to get support for CONFIG_UART_ASYNC_API, then the build fails with messages like this:

/opt/nordic/ncs/v1.7.1/toolchain/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.bfd:/ Users/denis/sandbox/itamar/workspace/zephyr/drivers/serial/uart_nrfx_uarte.c:530: undefined reference to `nrfx_timer_increment'

Is there anything else needed in order to get the nrfx timer support?

[Susheel Nuguru]

That is very strange, nrf_xtimer_enable and nrf_timer_increment are in the same module in nrfx_timer.c .

It looks like the compiler is not complaining about nrfx_timer_enable:527 but cannot see nrfx_timer_increment?