| From: | Peter Eisentraut <peter(at)eisentraut(dot)org> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: alignas (C11) |
| Date: | 2025-11-12 15:09:14 |
| Message-ID: | 0c246ee5-6d01-4f69-80c4-f5270d4b79fc@eisentraut.org |
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| Lists: | pgsql-hackers |
On 12.11.25 15:02, Andres Freund wrote:
> Hi,
>
> On 2025-11-12 12:39:19 +0100, Peter Eisentraut wrote:
>> - You cannot use alignas on a typedef. So some uses of the attribute
>> pg_attribute_aligned() like for PgAioUringContext or the whole int128
>> business cannot be converted directly. The solution for cases like
>> PgAioUringContext could be to move the alignas into the struct, but I
>> haven't studied this code closely enough, so I'm leaving it. For int128,
>> there is no straightforward solution, so I'm also leaving that as is.
>
> Maybe I'm confused, but the aligned attribute for PgAioUringContext is on the
> struct, not the typedef, no?
Yes, you're right. The immediate problem there is that alignas is not
syntactically valid at all at that position.
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