RE: [Bluez-devel] Alignment issue

[Marcel Holtmann <marcel@holtmann.org>]

Hi David,

> These should do it right on all architectures -- I've checked with a gcc
> hacker and verified that at least the get_unaligned() version does the
> right thing on both FR-V and i386. On FR-V it loads each byte and shifts
> it into place, while on i386 it just loads it.
> 
> #define get_unaligned(ptr)                      \
> ({                                              \
>         struct __attribute__((packed)) {        \
>                 typeof(*(ptr)) __v;             \
>         }  *__p = (ptr);                        \
>         __p->__v;                               \
> })
> 
> #define put_unaligned(ptr, val)			\
> do {                                            \
>         struct __attribute__((packed)) {        \
>                 typeof(*(ptr)) __v;             \
>         }  *__p = (ptr);                        \
>         __p->__v = (val);			\
> } while(0)

is it verified that this works with every GCC release? Some people still
use a 2.95 or older.

Regards

Marcel




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