On 20/02/12 17:51, Bernd Schmidt wrote:
> On 02/20/2012 06:39 PM, Richard Earnshaw wrote:
>> I'm not sure why it should be. Can't a user write
>>
>> #ifdef __cplusplus
>> #define BOOL bool
>> #else
>> #define bool _Bool
>> #endif
>>
>> struct x {
>> volatile BOOL a : 1;
>> volatile BOOL b : 1;
>> volatile unsigned char c : 6;
>> volatile BOOL d : 1;
>> } y;
>>
>> ?
>>
>> If you've got strict volatile bitfields, then the concept here is that
>> the access uses the declared type for accessing the member. Since in
>> the ABI bool has a defined size, then it should access the member using
>> that size.
>>
>> On ARM, sizeof bool is 1, so I'd take the above to mean that accessing
>> y.a to mean a read of a, b and c, but not d.
>
> What are your thoughts on the argument about enums?
>
>
> Bernd
>
Similar. A particular enumeration type has a defined size, so accesses
should use that size.
R.
