Hello,

The module "pa_log" proposed by Mr. Conway seems very near to the 
objective of my previuos post.

The objective  now is expand a line like: DEBUG 3 "%d\n" 14
to: if debug.val then logint 3 ( fun () -> Printf.printf "%d\" 14  ) 
else ();

However, it is necessary to migrate the module to new camlpx .

Please, could someone give any advice about the current options: camlp4 
or camlp5? PreCast? Functorial?

Thanks a lot.