[exim] No debug info but stay in foreground, how?

It seems the only way to make exim with the -bd option _not_ become a
daemon, and _not_ disconnect from the controlling terminal, is to also
give it a -d option.

I need the foreground behavior to run exim under the supervisor daemon,
but I don't care for the verbose debugging output. How can I limit it
to the absolute minimum? I tried -d-all, but then exim again
disconnects into the background :-(

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