From e56ced6e0a1529fcfb956645760bd31e1ad438c2 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Wed, 1 Apr 2026 21:18:53 -0700
Subject: [PATCH] Use C23 attribute syntax

---
 extlinux/btrfs.h | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/extlinux/btrfs.h b/extlinux/btrfs.h
index 17a10be3..521a1605 100644
--- a/extlinux/btrfs.h
+++ b/extlinux/btrfs.h
@@ -33,27 +33,27 @@ typedef u16 __le16;
 /*
  *  * this is used for both forward and backward root refs
  *   */
-struct btrfs_root_ref {
+struct [[gnu::packed]] btrfs_root_ref {
         __le64 dirid;
         __le64 sequence;
         __le16 name_len;
-} __attribute__ ((__packed__));
+};
 
-struct btrfs_disk_key {
+struct [[gnu::packed]] btrfs_disk_key {
         __le64 objectid;
         u8 type;
         __le64 offset;
-} __attribute__ ((__packed__));
+};
 
-struct btrfs_dir_item {
+struct [[gnu::packed]] btrfs_dir_item {
         struct btrfs_disk_key location;
         __le64 transid;
         __le16 data_len;
         __le16 name_len;
         u8 type;
-} __attribute__ ((__packed__));
+};
 
-struct btrfs_super_block {
+struct [[gnu::packed]] btrfs_super_block {
         uint8_t csum[32];
         uint8_t fsid[16];
         uint64_t bytenr;
@@ -81,7 +81,7 @@ struct btrfs_super_block {
         uint8_t root_level;
         uint8_t chunk_root_level;
         uint8_t log_root_level;
-        struct btrfs_dev_item {
+        struct [[gnu::packed]] btrfs_dev_item {
                 uint64_t devid;
                 uint64_t total_bytes;
                 uint64_t bytes_used;
@@ -96,9 +96,9 @@ struct btrfs_super_block {
                 uint8_t bandwidth;
                 uint8_t uuid[16];
                 uint8_t fsid[16];
-        } __attribute__ ((__packed__)) dev_item;
+        } dev_item;
         uint8_t label[256];
-} __attribute__ ((__packed__));
+};
 
 #define BTRFS_IOCTL_MAGIC 0x94
 #define BTRFS_VOL_NAME_MAX 255
-- 
2.49.0