making sizeof(void*) different from sizeof(void(*)())

[Paulo J. Matos]

On 30/04/12 13:01, Peter Bigot wrote:
> I would like to see the technical details, if your code is released somewhere.
>

Hi Peter,

Sorry for the delay.
The code is not released, however I can send you a patch against GCC 
4.6.3 sources (our GCC 4.7.0 port is not yet stable) of our changes and 
will also try to explain how it works.

> Without having started it yet, I'm thinking this can be done by
> modifying build_pointer_type to generalize the
> TARGET_ADDR_SPACE_POINTER_MODE to TARGET_TYPE_POINTER_MODE, pass it
> the whole type instead of just the address space field, and moving
> TARGET_ADDR_SPACE_POINTER_MODE support to the default implementation
> for that hook. Likewise for build_reference_type.  Then judicious
> application of attributes to types and decls would allow detection of
> the situation where a non-standard pointer size is needed.  I'm hoping
> there aren't too many other places where that work would get undone.
>

As you will see, I haven't used anything related to address spaces 
feature in GCC.

>>
>> Sounds like a useful set of changes to have in the main sources, since
>> this is hardly a singular need!
>
> Yes.  Is there an existing bug/enhancement report for this capability?
>

Don't think so but I would be happy to contribute with whatever I can.


-- 
PMatos