Am 17.10.2025 um 19:54 schrieb Pierre Muller via fpc-devel:
Hi David,
this looks very similar to a problem that we are trying to
debug for a while, and that I recently submitted as a bug report:
https://gitlab.com/freepascal.org/fpc/source/-/issues/41439
The problem has been nicely simplified by alligator in
https://gitlab.com/freepascal.org/fpc/source/-/issues/41444
There is some problem related to PPU writing...
I hope to be able using this simplified example t understand better
this issue,
but I am currently still busy with the previous issue, also raised by
alligator:
https://gitlab.com/freepascal.org/fpc/source/-/issues/41443
for which I hope to have found a fix.
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.
Regards,
Sven
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