From 8d7b6b4cb27d4dec1dd5f7960298c1699275f962 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Sat, 18 May 2024 09:33:19 +0200
Subject: socket: Use may_alias on sockaddr structs (bug 19622)

This supports common coding patterns.  The GCC C front end before
version 7 rejects the may_alias attribute on a struct definition
if it was not present in a previous forward declaration, so this
attribute can only be conditionally applied.

This implements the spirit of the change in Austin Group issue 1641.

Suggested-by: Marek Polacek <polacek@redhat.com>
Suggested-by: Jakub Jelinek <jakub@redhat.com>
Reviewed-by: Sam James <sam@gentoo.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
---
 socket/sys/un.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'socket')

diff --git a/socket/sys/un.h b/socket/sys/un.h
index bf03b7d6ce..ff9cbd6efa 100644
--- a/socket/sys/un.h
+++ b/socket/sys/un.h
@@ -26,7 +26,7 @@
 __BEGIN_DECLS
 
 /* Structure describing the address of an AF_LOCAL (aka AF_UNIX) socket.  */
-struct sockaddr_un
+struct __attribute_struct_may_alias__ sockaddr_un
   {
     __SOCKADDR_COMMON (sun_);
     char sun_path[108];		/* Path name.  */
-- 
cgit v1.2.3