On Thu, 4 Jul 2019 17:35:15 -0700
Jacob Jennings <jacob.r.jenni...@gmail.com> wrote:
> Hello,
>
> I am fond of using __attribute__((packed)) to document register definitions
> in this manner:
>
> typedef struct BitField {
> bool b7;
> bool b6;
> bool b5;
> bool b4;
> bool b3;
> bool b2;
> bool b1;
> bool b0;
> } __attribute__((packed)) BitField;
>
> Would I expect sdcc to generate packed structs without the attribute in
> this case? -fpack-struct=1 is unsupported, and __attribute((packed))__
> presents a syntax error.
Yes.
I ended up with a define __packed that is null for SDCC and cc65 but
__attribute((packed)) on other compilers that supported it.
Whilst it's not an SDCC concern the other problem is that some compilers
will generate safe code for packed field accesses, others don't.
Alan
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