Hi!
On Fri, Jun 13, 2025 at 06:52:19PM +0100, Tom V wrote:
> I have been trying to work out what all the rules are for where
> attribute((aligned(x))) can be used and where it can decrease alignment
> and where it can only increase it.
As the documentation says:
When used on a struct, or struct member, the 'aligned' attribute
can only increase the alignment; in order to decrease it, the
'packed' attribute must be specified as well. When used as part of
a typedef, the 'aligned' attribute can both increase and decrease
alignment, and specifying the 'packed' attribute generates a
warning.
Where in memory the thing ends up (on the stack, for example) is neither
here nor there. This stuff is at the language-level, not twenty or
thirty abstractions lower :-)
What you call "pointer target" is not clear, not to me at least. This
seems to be the core of your doubts.
Segher
