From e908a2c0e2b0a9d8a6915f60439f75adfe885b66 Mon Sep 17 00:00:00 2001 From: Bertrand Drouvot Date: Tue, 24 Feb 2026 09:55:36 +0000 Subject: [PATCH v1 2/2] Use C11 alignas in more tricky typedef definition Same as commit "xxx" but the alignas has to be guarded because it makes sense if used together with pg_attribute_packed(). Suggested-by: Peter Eisentraut Author: Bertrand Drouvot Discussion: https://postgr.es/m/d7a788fa-e609-4894-a8be-2f70e135424f%40eisentraut.org --- src/include/storage/itemptr.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) 100.0% src/include/storage/ diff --git a/src/include/storage/itemptr.h b/src/include/storage/itemptr.h index 8b3392dbefe..a70c543dac3 100644 --- a/src/include/storage/itemptr.h +++ b/src/include/storage/itemptr.h @@ -35,14 +35,17 @@ */ typedef struct ItemPointerData { +/* If compiler understands packed pragma, use alignas with it */ +#if defined(pg_attribute_packed) + alignas(2) +#endif BlockIdData ip_blkid; OffsetNumber ip_posid; } -/* If compiler understands packed and aligned pragmas, use those */ -#if defined(pg_attribute_packed) && defined(pg_attribute_aligned) +/* If compiler understands packed pragma, use it with alignas */ +#if defined(pg_attribute_packed) pg_attribute_packed() - pg_attribute_aligned(2) #endif ItemPointerData; -- 2.34.1