Bug#988304: exim4: rsyslog log files not getting any new info

[GSR]

Hi,
ametzler at bebt.de (2021-05-10 at 1938.37 +0200):
> what log_file_path setting are you using? I am aware that 
> log_file_path = :syslog
> does not duplicate the entries to syslog but only logs to /var/log/exim4
> (See https://bugs.exim.org/show_bug.cgi?id=2733#c5 and later.)

Same config. To be exact, these are the config lines about syslog,
which have worked for years (log msgs once to syslog without time as
it will be added by logger and log to own files+syslog):
---8<---
syslog_duplication = false
syslog_timestamp = false
log_file_path = :syslog
--->8---
I just checked the documentation at exim.org and it seems their
purpose has not changed.

I see in the bugreport that explicit "/var/log/exim4/%slog : syslog"
works, but not ":syslog". So Debian 988304 is upstream 2733#c3.

Are we sure exim4 contacts rsyslog at all? Got the source, and all
those "else" & "if" without {} in src/log.c write_syslog() make me
doubt the compiler and humans agree what the source means.

Cheers,
GSR