[Lazarus] Library internals and interface based data aware controls

[Marc Weustink]

Juha Manninen wrote:
> Hi,
> 
> I have learned more about Lazarus / FPC by porting some Delphi code. It seems 
> to be very usable now, I am impressed. I must admit I considered it as a 
> hopeless project some years ago when I first noticed it. Not any more...
> 
> But first a minor complaint. I often get errors like:
>   Error: Illegal type conversion: "ShortString" to "^Char"
> or
>   Error: Call by var for arg no. 2 has to match exactly: Got "AnsiString" 
> expected "ShortString"
> 
> if I don't add
>   {$MODE DELPHI}
> into a source file. However, I don't explicitly define any short strings. The 
> default objfpc mode illogically thinks a "string" as function parameter is 
> short string but other "string"s are dynamic ansistrings (or something like 
> that).
> The language has evolved and short string is mostly a historical remain. 
> I would suggest that MODE DELPHI is made default in Lazarus or then FPC's MODE 
> OBJFPC is fixed.

Mode fpc is default for the compiler. If a unit is added by Lazarus it 
always contains {$mode objfpc}{$h+}

Marc