I have a whole section of diagnostic writeln's in a program, and it's tedious to comment them all out/in as needed. I'm curious if doing something like

Const
   diagnosticdetail=false;
If diagnosticdetail then Writeln('diagnostic info');

Is the same as

// Writeln('diagnostic info');

And the Writeln will actually end up being left out of the compiled program altogether... since the constant will never allow it to run, or if not, is there a better way to optionally exclude diagnostic information entirely from the compiled program?

In C typically you would use conditional compilation. This would work well in FPC as well. Or, you can do what is more often done in higher level or managed languages, which is to use a log function that behaves differently based on the verbosity level.

Cheers,
R0b0t1

James Richters schrieb am Mi., 18. Apr.
2018, 05:00:

It should be excluded. You can confirm this by checking the assembler output generated with "-al".

Regards,
Sven

Il 18/04/2018 05:06, James Richters ha scritto:

is there a better way to optionally exclude diagnostic information entirely from the compiled program?

Did you consider to replace your Writeln with a DiagWrite (or whatever name you prefer),

and have a DiagWrite such as:

DiagWrite: Procedure(aMessage: string); inline;
begin
   if diagnosticdetail then Writeln(aMessage);
end;

This should do the job, and reduce your typing.

Giuliano

Hi,
 
Why not define?
 
{$DEFINE DEBUG}
 
{$IFDEF DEBUG} Writeln('diagnostic info'); {$ENDIF}  
V.
 
______________________________________________________________

I have a whole section of diagnostic writeln's in a program, and it's tedious to comment them all out/in as needed.   I'm curious if doing something like

 Const
   diagnosticdetail=false;
 If diagnosticdetail then Writeln('diagnostic info');

Is the same as

 // Writeln('diagnostic info');

And the Writeln will actually end up being left out of the compiled program altogether... since the constant will never allow it to run,  or if not, is there a better way to optionally exclude diagnostic information entirely from the compiled program?

James Richters wrote

I have a whole section of diagnostic writeln's in a program, and it's tedious to comment them all out/in as needed. I'm curious if doing something like

what's wrong with traditional IFDEF?? use something like this...

{$IFDEF DEBUG}
writeln ('blahblahblah');
writeln (LOGFILE,'blahblahblah');
flush (LOGFILE);
{$ENDIF}

then you simply create the DEBUG define...

-DDEBUG

if you don't want it, leave it out and none of the bracketd code is even included...

I agree. Another possibility is something like

{$if declared(customDebugWrite) }
   customDebugWrite(...);
{$endif declared()         }

so if customDebugWrite() isn't present in the program during compilation (commented out, or the entire unit containing it omitted) no attempt will be made to call it.