[fpc-devel] Nasty generics-bug, already known?

[Sven Barth]

Am 24.04.2020 um 22:27 schrieb Joost van der Sluis:
> Hi all, Sven,
>
> I have a very nasty bug related to generics.
>
> Suppose that I have a unit with a generic-class in it. Nothing more. 
> This unit is in a package.
>
> Now I also have a unit which is part of an application. Within this 
> unit I specialize the generic class of the first unit.
>
> Now, when I change the first unit. The changed code never makes it 
> into my application.
>
> (This has probably to do with the interface of the first unit, which 
> does not change)
>
> But also when I remove the original first unit, and recompile the 
> package, but do not touch the ppu of the application, the changed code 
> is not used. (This because the unit that belongs to the application 
> already contains the specialized code from the first unit. It does not 
> detect a change in the first unit, so nothings happens.)
>
> The question is: is this a known bug?
>
> If not, I can create an example and a more extensive explanation.

Well, it is in so far known that I know that we have situations where 
recompilation doesn't happen correctly. Having a reproducible, simple 
example however would definitely help (the current examples that we have 
are always rather complex ones).

Regards,
Sven