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socket: Use may_alias on sockaddr structs (bug 19622)

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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>
This commit is contained in:
Florian Weimer
2024-05-18 09:33:19 +02:00
parent 2a99e2398d
commit 8d7b6b4cb2
10 changed files with 25 additions and 14 deletions
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4
sysdeps/unix/sysv/linux/bits/socket.h
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@ -181,7 +181,7 @@ typedef __socklen_t socklen_t;
#include <bits/sockaddr.h>
/* Structure describing a generic socket address. */
struct sockaddr
struct __attribute_struct_may_alias__ sockaddr
{
__SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
char sa_data[14]; /* Address data. */
@ -194,7 +194,7 @@ struct sockaddr
#define _SS_PADSIZE \
(_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
struct sockaddr_storage
struct __attribute_struct_may_alias__ sockaddr_storage
{
__SOCKADDR_COMMON (ss_); /* Address family, etc. */
char __ss_padding[_SS_PADSIZE];