[fpc-devel] delphi compatibility issues

[Mario R. Carro]

On Friday 25 May 2007, Marc Weustink wrote:
> Mario R. Carro wrote:
> > Hi, I'm trying to compile the JCL with FreePascal (the common, unix and
> > vcl folders). Excluding the portability errors in the JCL, I found some
> > issues that I think could be best solved by FPC (and benefit the porting
> > of any other Delphi project also). I'm using FPC from SVN (updated
> > daily).
> >
> > Here is a little list:
> >
> > - Some assembler does not compile. For example this function, in
> > JclLogic.pas:
> >
> > procedure SetBitBuffer(var Value; const Bit: Cardinal);
> > asm
> >   BTS    [Value], Bit
> > end;
> >
> > This unit can be compiled with FPC defining PUREPASCAL but with degraded
> > performance in many functions.
> >
> > - Interface implementation delegation requires an interface type (but
> > Delphi accepts classes). For example, in JclSchedule.pas:
> >
> >     property DailyFreq: TDailyFreq read FDailyFreq implements
> > IJclScheduleDayFrequency;
> >
> > where TDailyFreq is a class (derived from TAggregatedObject).
> >
> > - Classes implementing interfaces must implement all the interface
> > methods (but Delphi compiles the code happily without them).
>
> Ow ?
> I've coded a lot if interfaces with D6 and luckely it complained if I
> forgot to implement some of them.
>
> What version of Delphi did you use ?

Hi, I'm using D7. But you are right. This is a consequence of the previous 
problem: That class implements many interfaces by way of "implementation 
properties" that FPC does not accept yet (as detailed above), hence all the 
methods of the interfaces that should have been delegates to that properties 
remain undefined and FPC complains (rightly).

>
> Marc
>

Thanks,
Mario

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