[Bug default/27715] Fails to detect GObjectClass ABI changes

["marcandre.lureau at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27715

--- Comment #8 from Marc-André Lureau <marcandre.lureau at gmail dot com> ---
(In reply to Matthias Maennich from comment #7)
> Thanks for that.
> 
> I can see that:
>  - _GTypeModuleClass increases in size from old->new in DWARF
>  - old and new have debug information sufficient for ABI analysis
>  - _GTypeModuleClass is not attached directly or indirectly as a type to any
> ELF symbol
> 
> Can you please tell me which symbol you would expect to become incompatible
> based on a change to this class? How does it relate to any of the exported
> symbols?

FooClass/vtable (and other object-oriented structures) are often passed around
as void * (or parent types) on the public functions etc. However, the
implementation then cast the void/parent pointer to some concrete type, and
expect the structure to keep the same layout.

So any change in those OO structures is an ABI break, it would be nice to catch
them.

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