Re: emacs-26 9e59de9: Use GCALIGNED properly for GCC

[Paul Eggert]

Stefan Monnier wrote:
> Then I don't understand what you meant by "that does not work either".

I was confused (:-). I suppose I was worried about the admittedly unlikely 
possibility of a platform where alignof (int64_t) exceeds 8. This worry stemmed 
from an earlier iteration of this fix, where we ran into such a type on 
MS-Windows. Although perhaps I'm worrying too much, the point remains that 
because int64_t's alignment is not always a multiple of 8, using int64_t for 
alignment would not suffice for platforms where alignas does not work.

Also, there's at least one type (struct vectorlike_header) where alignment is 
convenient, and where the type's size is smaller than int64_t on some platforms, 
so using int64_t for alignment there would cause objects of this type (and of 
its containing types) to grow unnecessarily.