[fpc-devel] Generic method works on Linux, not on Windows?

Sven Barth pascaldragon at googlemail.com
Fri May 29 21:36:15 CEST 2020

Am 27.05.2020 um 00:41 schrieb Yuriy Sydorov:
> On 27.05.2020 1:01, Joost van der Sluis wrote:
>> Op 26-05-2020 om 23:36 schreef Yuriy Sydorov:
>>> Does it happen with the fpc trunk?
>>> If yes, what revision do you use? It looks like an issue with my 
>>> initial implementation of the $parentfp parameter optimization. 
>>> "$fin$00000037" is a reference to an internal SEH handler procedure 
>>> which is a special nested procedure.
>> Yes, Trunk, updated last sunday. (And today, didn't help) x86_64
>>> The latest trunk for win32 compiles fine the following modified 
>>> example:
>>> {$mode objfpc}{$H+}
>>> generic function CreateObjectFromJSONString<T>(AJSONString: string; 
>>> ADescriptionTag: string = ''): T;
>>> begin
>>>    Result := nil;
>>> end;
>>> var
>>>    LaunchRequest: TObject;
>>> begin
>>>    LaunchRequest := specialize 
>>> CreateObjectFromJSONString<TObject>('qwe');
>>> end.
>> It's this project: https://gitlab.freepascal.org/Joost/fpdserver/
>> And the generic function is defined in:
>> https://gitlab.freepascal.org/Joost/cerialization
>> I'll try your code tomorrow. Maybe I can get an easier example.
> Thanks for the sources. When I put a generic function in a separate 
> unit, I am able to reproduce the issue.
> Surprisingly it is not caused by my changes, since it fails even with 
> earlier revisions. I've tested with r44958 and it still fails.
> It would be nice if you find the offending revision.

Would you please provide your example that fails? I can't get it to fail...


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