[Interest] Void pointers for Mac ARM

[coroberti]

Sorry, no knowledge about the pragma and how it's handled by clang.

I'd make it all 8-bytes aligned on 64-bit.

Kind regards,
Robert Iakobashvili
............................

On Mon, Jun 19, 2023 at 2:14 PM Turtle Creek Software
<support at turtlesoft.com> wrote:
>
> Alignment is definitely possible.  There was a similar problem earlier in execution, and that had pointers to 2-byte aligned structs.
> We just rewrote the ugly void* code rather than try to diagnose it further.  The debugger showed the correct address but failed to cast a parameter.
>
> Can the ARM compiler handle #pragma pack (2) ?
>
> Thanks,
> Casey McDermott
> TurtleSoft.com
>
> On Mon, Jun 19, 2023 at 2:50 AM coroberti <coroberti at gmail.com> wrote:
>>
>> On Sat, Jun 17, 2023 at 8:12 PM Turtle Creek Software
>> <support at turtlesoft.com> wrote:
>> >
>> > Our app contains some old C-ish C++ code from an early 90's database called NeoAccess. It often uses function pointers with void pointers as parameters.  Their code works OK for Mac & Windows, when built with the latest Qt5 on Intel.
>> >
>> > The code also builds OK with the latest Qt6, but running it on an M1 Mac gives run-time errors. Void pointers to structs and objects don't cast properly and stay null.  We haven't tried Qt6 on Windows yet but will do that soon.
>> >
>> > Any ideas on how to fix it?  We've abandoned NeoAccess for our new app but still need it to convert data from existing files.  Rewriting their code is a nightmare.
>>
>> Casey,
>> Perhaps, checking the alignment of the void* pointers in question
>> could provide you with some clues.
>>
>> Kind regards,
>> Robert Iakobashvili
>> ............................