[COMMITTED PATCH] Clean up __libc_sa_len helper.

[Roland McGrath <roland at frob dot com>]

	* socket/sa_len.c: New file.
	* socket/Makefile (aux): Add it.
	* sysdeps/unix/sysv/linux/Makefile
	[$(subdir) = socket] (sysdep_routines): Don't add sa_len here.
	* sysdeps/unix/sysv/linux/sa_len.c: Just #define HAVE_NET*_H
	and #include <socket/sa_len.c>.
	* sysdeps/unix/sysv/linux/s390/sa_len.c: Just #define
	HAVE_NETIUCV_IUCV_H and #include <sysdeps/unix/sysv/linux/sa_len.c>.

--- a/socket/Makefile
+++ b/socket/Makefile
@@ -28,6 +28,6 @@ routines := accept bind connect getpeername getsockname getsockopt	\
 	    setsockopt shutdown socket socketpair isfdtype opensock	\
 	    sockatmark accept4 recvmmsg sendmmsg
 
-aux	 := have_sock_cloexec
+aux	 := have_sock_cloexec sa_len
 
 include ../Rules
--- /dev/null
+++ b/socket/sa_len.c
@@ -0,0 +1,108 @@
+/* Helper for SA_LEN macro.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/socket.h>
+
+/* If _HAVE_SA_LEN is defined, then SA_LEN just uses sockaddr.sa_len
+   and there is no need for a helper function.  */
+
+#ifndef _HAVE_SA_LEN
+
+/* All configurations have at least these two headers
+   and their associated address families.  */
+
+# include <netinet/in.h>
+# include <sys/un.h>
+
+/* More-specific sa_len.c files #define these various HAVE_*_H
+   macros and then #include this file.  */
+
+# ifdef HAVE_NETASH_ASH_H
+#  include <netash/ash.h>
+# endif
+# ifdef HAVE_NETATALK_AT_H
+#  include <netatalk/at.h>
+# endif
+# ifdef HAVE_NETAX25_AX25_H
+#  include <netax25/ax25.h>
+# endif
+# ifdef HAVE_NETECONET_EC_H
+#  include <neteconet/ec.h>
+# endif
+# ifdef HAVE_NETIPX_IPX_H
+#  include <netipx/ipx.h>
+# endif
+# ifdef HAVE_NETPACKET_PACKET_H
+#  include <netpacket/packet.h>
+# endif
+# ifdef HAVE_NETROSE_ROSE_H
+#  include <netrose/rose.h>
+# endif
+# ifdef HAVE_NETIUCV_IUCV_H
+#  include <netiucv/iucv.h>
+# endif
+
+int
+__libc_sa_len (sa_family_t af)
+{
+  switch (af)
+    {
+# ifdef HAVE_NETATALK_AT_H
+    case AF_APPLETALK:
+      return sizeof (struct sockaddr_at);
+# endif
+# ifdef HAVE_NETASH_ASH_H
+    case AF_ASH:
+      return sizeof (struct sockaddr_ash);
+# endif
+# ifdef HAVE_NETAX25_AX25_H
+    case AF_AX25:
+      return sizeof (struct sockaddr_ax25);
+# endif
+# ifdef HAVE_NETECONET_EC_H
+    case AF_ECONET:
+      return sizeof (struct sockaddr_ec);
+# endif
+    case AF_INET:
+      return sizeof (struct sockaddr_in);
+    case AF_INET6:
+      return sizeof (struct sockaddr_in6);
+# ifdef HAVE_NETIPX_IPX_H
+    case AF_IPX:
+      return sizeof (struct sockaddr_ipx);
+# endif
+# ifdef HAVE_NETIUCV_IUCV_H
+    case AF_IUCV:
+      return sizeof (struct sockaddr_iucv);
+# endif
+    case AF_LOCAL:
+      return sizeof (struct sockaddr_un);
+# ifdef HAVE_NETPACKET_PACKET_H
+    case AF_PACKET:
+      return sizeof (struct sockaddr_ll);
+# endif
+# ifdef HAVE_NETROSE_ROSE_H
+    case AF_ROSE:
+      return sizeof (struct sockaddr_rose);
+# endif
+    }
+  return 0;
+}
+libc_hidden_def (__libc_sa_len)
+
+#endif  /* Not _HAVE_SA_LEN.  */
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -120,7 +120,7 @@ ifeq ($(subdir),socket)
 sysdep_headers += net/if_ppp.h net/ppp-comp.h \
 		  net/ppp_defs.h net/if_arp.h net/route.h net/ethernet.h \
 		  net/if_slip.h net/if_packet.h net/if_shaper.h
-sysdep_routines += cmsg_nxthdr sa_len
+sysdep_routines += cmsg_nxthdr
 endif
 
 ifeq ($(subdir),sunrpc)
--- a/sysdeps/unix/sysv/linux/s390/sa_len.c
+++ b/sysdeps/unix/sysv/linux/s390/sa_len.c
@@ -1,2 +1,3 @@
-#define NEED_AF_IUCV 1
-#include "../sa_len.c"
+#define HAVE_NETIUCV_IUCV_H
+
+#include <sysdeps/unix/sysv/linux/sa_len.c>
--- a/sysdeps/unix/sysv/linux/sa_len.c
+++ b/sysdeps/unix/sysv/linux/sa_len.c
@@ -1,63 +1,9 @@
-/* Copyright (C) 1998-2013 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sys/socket.h>
-
-#include <netash/ash.h>
-#include <netatalk/at.h>
-#include <netax25/ax25.h>
-#include <neteconet/ec.h>
-#include <netinet/in.h>
-#include <netipx/ipx.h>
-#include <netpacket/packet.h>
-#include <netrose/rose.h>
-#include <netiucv/iucv.h>
-#include <sys/un.h>
-
-int
-__libc_sa_len (sa_family_t af)
-{
-  switch (af)
-    {
-    case AF_APPLETALK:
-      return sizeof (struct sockaddr_at);
-    case AF_ASH:
-      return sizeof (struct sockaddr_ash);
-    case AF_AX25:
-      return sizeof (struct sockaddr_ax25);
-    case AF_ECONET:
-      return sizeof (struct sockaddr_ec);
-    case AF_INET:
-      return sizeof (struct sockaddr_in);
-    case AF_INET6:
-      return sizeof (struct sockaddr_in6);
-    case AF_IPX:
-      return sizeof (struct sockaddr_ipx);
-#ifdef NEED_AF_IUCV
-    case AF_IUCV:
-      return sizeof (struct sockaddr_iucv);
-#endif
-    case AF_LOCAL:
-      return sizeof (struct sockaddr_un);
-    case AF_PACKET:
-      return sizeof (struct sockaddr_ll);
-    case AF_ROSE:
-      return sizeof (struct sockaddr_rose);
-    }
-  return 0;
-}
-libc_hidden_def (__libc_sa_len)
+#define HAVE_NETASH_ASH_H
+#define HAVE_NETATALK_AT_H
+#define HAVE_NETAX25_AX25_H
+#define HAVE_NETECONET_EC_H
+#define HAVE_NETIPX_IPX_H
+#define HAVE_NETPACKET_PACKET_H
+#define HAVE_NETROSE_ROSE_H
+
+#include <socket/sa_len.c>