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Date: Wed, 29 Jul 2015 05:00:28 -0700 (PDT)
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Subject: Re: Running a preprocessor from GPS?
From: EGarrulo <egarrulo@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:27124
Date: 2015-07-29T05:00:28-07:00
List-Id: <comp.lang.ada>

On Wednesday, July 29, 2015 at 12:31:25 PM UTC+2, Brian Drummond wrote:
> waitaminit ... if you use a preprocessor, the logging code DOESN'T stay 
> and isn't controllable at runtime.

But I would use a preprocessor to expand code unconditionally.  If using the C preprocessor, it would be something like this:

#define TRACE(level,message)          \
            if Active (Level) then    \
               Trace(Level, Message); \
            end if;

Note: for simplicity, I haven't addressed the problem of evaluating `Level` twice.