[fpc-pascal] LongInt and LongWord types

[Sven Barth]

Am 08.07.2020 um 23:00 schrieb Marcelo Rocha via fpc-pascal:
> Delphi's LongInt and LongWord are 32 bits on Windows, but 64 bits on 
> supported Posix 
> platforms(http://docwiki.embarcadero.com/RADStudio/Rio/en/Simple_Types_(Delphi)), 
> following the conventions from LP64/LLP64. FreePascal declares with 
> the same size for all platforms.
>
> What's the best way to do portable code: using types clong and culong?

Best declare your own aliases with the help of some ifdefs (clong/culong 
don't exist in Delphi, so you'd have to declare aliases anyway).

>
> FreePascal could emit a warning when compiling a code with 
> Longint/Longword variables, targeting a Posix platform, with {$mode 
> delphi}?

LongInt and LongWord are the *base* types used by FPC. So *everything* 
is using them, because Integer and Cardinal are merely aliases. Not to 
mention that FPC has provided 64-bit support first on Posix platforms 
way back and for that is was decided to keep the size of LongInt and 
LongWord the same on all platforms for consistency. This will not be 
changed and there won't be a warning for that.
What there is, is a remark in the documention (in 
https://www.freepascal.org/docs-html/current/ref/refsu4.html#x26-250003.1.1 
): "Remark In newer Delphi versions, the longint type is platform and 
CPU dependent. This is not so in FPC, where longint is 32-bit on all 
platforms."

Regards,
Sven
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