Fix scandir scandirat namespace (bug 17999).

The POSIX function scandir calls scandirat, which is not a POSIX
function.  This patch fixes this by making it use __scandirat and
making scandirat a weak alias.  There are no changes for scandir64 /
scandirat64 because those are both _GNU_SOURCE-only functions so no
namespace issue arises for them.

Tested for x86_64 that the disassembly of installed shared libraries
is unchanged by this patch.

	[BZ #17999]
	* dirent/scandir.c [!SCANDIR] (SCANDIRAT): Define to __scandirat
	instead of scandirat.
	* dirent/scandirat.c [!SCANDIRAT] (SCANDIRAT): Likewise.
	[!SCANDIRAT] (SCANDIRAT_WEAK_ALIAS): Define.
	[SCANDIRAT_WEAK_ALIAS] (scandirat): Define as weak alias of
	__scandirat.
	* include/dirent.h (scandirat): Do not use libc_hidden_proto.
	(__scandirat): Declare.  Use libc_hidden_proto.
	* conform/Makefile (test-xfail-POSIX2008/dirent.h/linknamespace):
	Remove variable.
	(test-xfail-XOPEN2K8/dirent.h/linknamespace): Likewise.

ChangeLog

@@ -1,3 +1,18 @@
+2015-02-19  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #17999]
+	* dirent/scandir.c [!SCANDIR] (SCANDIRAT): Define to __scandirat
+	instead of scandirat.
+	* dirent/scandirat.c [!SCANDIRAT] (SCANDIRAT): Likewise.
+	[!SCANDIRAT] (SCANDIRAT_WEAK_ALIAS): Define.
+	[SCANDIRAT_WEAK_ALIAS] (scandirat): Define as weak alias of
+	__scandirat.
+	* include/dirent.h (scandirat): Do not use libc_hidden_proto.
+	(__scandirat): Declare.  Use libc_hidden_proto.
+	* conform/Makefile (test-xfail-POSIX2008/dirent.h/linknamespace):
+	Remove variable.
+	(test-xfail-XOPEN2K8/dirent.h/linknamespace): Likewise.
+
 2015-02-18  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #15319]

NEWS

@@ -10,7 +10,7 @@ Version 2.22
 * The following bugs are resolved with this release:
 
   4719, 15319, 15467, 15790, 16560, 17569, 17792, 17912, 17932, 17944,
-  17949, 17964, 17965, 17967, 17969, 17978, 17987, 17991, 17996.
+  17949, 17964, 17965, 17967, 17969, 17978, 17987, 17991, 17996, 17999.
 
 Version 2.21
 

conform/Makefile

@@ -393,13 +393,11 @@ test-xfail-XOPEN2K/syslog.h/linknamespace = yes
 test-xfail-XOPEN2K/ucontext.h/linknamespace = yes
 test-xfail-XOPEN2K/unistd.h/linknamespace = yes
 test-xfail-XOPEN2K/wordexp.h/linknamespace = yes
-test-xfail-POSIX2008/dirent.h/linknamespace = yes
 test-xfail-POSIX2008/grp.h/linknamespace = yes
 test-xfail-POSIX2008/netdb.h/linknamespace = yes
 test-xfail-POSIX2008/regex.h/linknamespace = yes
 test-xfail-POSIX2008/semaphore.h/linknamespace = yes
 test-xfail-POSIX2008/unistd.h/linknamespace = yes
-test-xfail-XOPEN2K8/dirent.h/linknamespace = yes
 test-xfail-XOPEN2K8/fmtmsg.h/linknamespace = yes
 test-xfail-XOPEN2K8/grp.h/linknamespace = yes
 test-xfail-XOPEN2K8/netdb.h/linknamespace = yes

dirent/scandir.c

@@ -28,7 +28,7 @@
 
 #ifndef SCANDIR
 # define SCANDIR scandir
-# define SCANDIRAT scandirat
+# define SCANDIRAT __scandirat
 # define DIRENT_TYPE struct dirent
 #endif
 

dirent/scandirat.c

@@ -30,9 +30,10 @@
 #include <bits/libc-lock.h>
 
 #ifndef SCANDIRAT
-# define SCANDIRAT scandirat
+# define SCANDIRAT __scandirat
 # define READDIR __readdir
 # define DIRENT_TYPE struct dirent
+# define SCANDIRAT_WEAK_ALIAS
 #endif
 
 #ifndef SKIP_SCANDIR_CANCEL
@@ -148,6 +149,9 @@ SCANDIRAT (dfd, dir, namelist, select, cmp)
   return c.cnt;
 }
 libc_hidden_def (SCANDIRAT)
+#ifdef SCANDIRAT_WEAK_ALIAS
+weak_alias (__scandirat, scandirat)
+#endif
 
 #ifdef _DIRENT_MATCHES_DIRENT64
 weak_alias (scandirat, scandirat64)

include/dirent.h

@@ -50,7 +50,8 @@ extern void __scandir_cancel_handler (void *arg);
 extern __typeof (rewinddir) __rewinddir;
 
 libc_hidden_proto (__rewinddir)
-libc_hidden_proto (scandirat)
+extern __typeof (scandirat) __scandirat;
+libc_hidden_proto (__scandirat)
 libc_hidden_proto (scandirat64)
 # endif