[fpc-devel] Macro Processing

[Martin]

On 13/05/2011 19:29, Florian Klämpfl wrote:
> Am 13.05.2011 17:41, schrieb Martin:
>>
>> {$MACRO ON}
>> //{$DEFINE DEBUG_DWARF_PARSER}
>> {$ifdef DEBUG_DWARF_PARSER}
>>    {$define DEBUG_WRITELN := WriteLn}
>> {$else}
>>    {$define DEBUG_WRITELN := //}
>> {$endif}
>>
>>
>> and then
>>      DEBUG_WRITELN('Skipping directory : ', s);
> Or just use an inline function with ifdef as mentioned previously. An
> inline function with an empty procedure body shouldn't cause any
> additional code.

First of all, i an *no* friend of the example above, nor do I plan to 
ever do something like it. I don't even plan on using macros at all.
But I found it an interesting example how far you can already get with 
the current macros.

Personally, I IFDEF my debug code. I see it as an advantage. Since the 
IDE can highlight IFDEFs, I can quickly differentiate them from normal code.

About the inline, and no code generated, if the body is empty.

Dose this apply, even if the procedure takes parameters, and some of the 
params are function calls ? This is, will fpc skip the function calls, 
as their result is not used?
I haven't tested it, just curious.

Martin