[fpc-devel] Optimization breaks check for overridden function / Is there a better way to check?

[Sven Barth]

Am 18.10.2025 um 22:39 schrieb Bart via fpc-devel:
> On Fri, Oct 17, 2025 at 9:33 PM Sven Barth via fpc-devel
> <fpc-devel at lists.freepascal.org> wrote:
>
>> David's problem is *not* due to a corruction or a bug, but due to an
>> optimization that FPC performs that leads to different behavior, namely
>> changing virtual methods that are empty to EmptyMethod to reduce the
>> number of duplicate (empty) methods in the binary.
> Does that mena that such a check is in essence invalid?
> IIRC then we have such a check in TCustomEdit in LCL....
Well, the language does neither explicitly forbid nor allow it... So 
you'd have to do a more complete check that includes both the real base 
method as well as System.EmptyMethod. Maybe best move the general check 
to a separate function which gets passed both method pointers and then 
compares those as well as the base one against EmptyMethod. Regards, Sven
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