How to use dictionary logging when no backends are enabled?

[ashwinyes]

We have a use case where we require to log to a buffer. The buffer will be drained out by a host and Zephyr need not bother about this part.

I would like to enable CONFIG_LOG_FRONTEND and CONFIG_LOG_FRONTEND_ONLY, and implement my own versions of log_frontend_msg(), log_frontend_panic() and log_frontend_init() which will be logging to the buffer. So I don't require any backends.

Here I am not able to enable dictionary logging as it has a dependency on one of the backends which supports it.

Why is dictionary logging not supported when only frontend is required?

[yashi]

The help message says:

Dictionary based logging is binary based where predefined strings are
replaced with their equivalent addresses from the built binary image
file in log output. This reduces the size required to store the log
output when there are long format strings to be logged.

This should be selected by the backend automatically.