[fpc-devel] Windows 64bit SEH exception handling

[Sergei Gorelkin]

19.06.2012 23:43, tomek пишет:
> Hello,
>
> with reference to http://bugs.freepascal.org/view.php?id=12742 about random crash with Windows
> OpenDialog Box only on Win7 64bit.
>
> Today I compile trunk-fpc with TEST_WIN64_SEH support and it seems that this bug is resolved with SEH.
> I checked a few times to make sure that this is due to SEH support.
>
> My question is, why? how is it possible that support for SEH exceptions handling fix OpenDialog issue ?
> or perhaps an exception is hidden ? as described in http://support.microsoft.com/kb/976038
>
> do have you any suggestions ?
>
Non-SEH exception handling on Win64 is known to handle exceptions too early, bypassing frame-based 
handlers and therefore disrupting the intended control flow. Most probably the exception under 
question was meant to be handled within OS libraries and not passed to the application.

Regards,
Sergei