bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Paul Eggert]

On 5/30/20 9:42 AM, Eli Zaretskii wrote:
>> That's not correct for !USE_LSB_TAG, where LISP_ALIGNMENT is merely the 
>> native
>> alignment (there's no need to align objects to 8 because the tags are at the
>> high end).
> I'm using a !USE_LSB_TAG build, but LISP_ALIGNMENT is 8 nonetheless.

That's true for your platform, since alignof (max_align_t) == 8 on your
platform. But neither the C standard nor POSIX guarantee that alignof
(max_align_t) is 8. Admittedly these days one would have to look hard to find a
platform where alignof (max_align_t) is 4 or less.