Fix getlogin_r namespace (bug 18527).

Various functions in XPG4 bring in references to getlogin_r, which is
not in XPG4; this is also a bug for some older POSIX versions which
aren't yet covered by the linknamespace tests.  This patch fixes this
by making getlogin_r into a weak alias for __getlogin_r and using
__getlogin_r as needed.

Tested for x86_64 and x86 (testsuite, and that disassembly of
installed stripped shared libraries is unchanged by the patch).

	[BZ #18527]
	* login/getlogin_r.c (getlogin_r): Rename to __getlogin_r and
	define as weak alias of __getlogin_r.  Use libc_hidden_weak.
	* sysdeps/mach/hurd/getlogin_r.c (getlogin_r): Likewise.
	* sysdeps/unix/getlogin_r.c (getlogin_r): Likewise.
	* sysdeps/unix/sysv/linux/getlogin_r.c (getlogin_r): Likewise.
	* include/unistd.h (__getlogin_r): Declare.  Use
	libc_hidden_proto.
	* posix/glob.c (glob): Call __getlogin_r instead of getlogin_r.
	* conform/Makefile (test-xfail-XPG3/glob.h/linknamespace): Remove
	variable.
	(test-xfail-XPG3/wordexp.h/linknamespace): Likewise.
	(test-xfail-XPG4/glob.h/linknamespace): Likewise.
	(test-xfail-XPG4/wordexp.h/linknamespace): Likewise.

3 files changed, 14 insertions, 8 deletions

diff --git a/sysdeps/mach/hurd/getlogin_r.c b/sysdeps/mach/hurd/getlogin_r.c
index f1c2951b39..9c66f865ab 100644
--- a/sysdeps/mach/hurd/getlogin_r.c
+++ b/sysdeps/mach/hurd/getlogin_r.c
@@ -25,7 +25,7 @@
    If it cannot be determined or some other error occurred, return the error
    code.  Otherwise return 0.  */
 int
-getlogin_r (name, name_len)
+__getlogin_r (name, name_len)
      char *name;
      size_t name_len;
 {
@@ -45,4 +45,6 @@ getlogin_r (name, name_len)
   memcpy (name, login, len);
   return 0;
 }
-libc_hidden_def (getlogin_r)
+libc_hidden_def (__getlogin_r)
+weak_alias (__getlogin_r, getlogin_r)
+libc_hidden_weak (getlogin_r)
diff --git a/sysdeps/unix/getlogin_r.c b/sysdeps/unix/getlogin_r.c
index 4a31d254ee..8bb3de5e75 100644
--- a/sysdeps/unix/getlogin_r.c
+++ b/sysdeps/unix/getlogin_r.c
@@ -34,7 +34,7 @@
 STATIC
 #endif
 int
-getlogin_r (name, name_len)
+__getlogin_r (name, name_len)
      char *name;
      size_t name_len;
 {
@@ -99,5 +99,7 @@ getlogin_r (name, name_len)
   return result;
 }
 #ifndef STATIC
-libc_hidden_def (getlogin_r)
+libc_hidden_def (__getlogin_r)
+weak_alias (__getlogin_r, getlogin_r)
+libc_hidden_weak (getlogin_r)
 #endif
diff --git a/sysdeps/unix/sysv/linux/getlogin_r.c b/sysdeps/unix/sysv/linux/getlogin_r.c
index 2c52b2183b..aa61f6134d 100644
--- a/sysdeps/unix/sysv/linux/getlogin_r.c
+++ b/sysdeps/unix/sysv/linux/getlogin_r.c
@@ -21,9 +21,9 @@
 
 #define STATIC static
 static int getlogin_r_fd0 (char *name, size_t namesize);
-#define getlogin_r getlogin_r_fd0
+#define __getlogin_r getlogin_r_fd0
 #include <sysdeps/unix/getlogin_r.c>
-#undef getlogin_r
+#undef __getlogin_r
 
 
 /* Try to determine login name from /proc/self/loginuid and return 0
@@ -109,7 +109,7 @@ __getlogin_r_loginuid (name, namesize)
    code.  Otherwise return 0.  */
 
 int
-getlogin_r (name, namesize)
+__getlogin_r (name, namesize)
      char *name;
      size_t namesize;
 {
@@ -119,4 +119,6 @@ getlogin_r (name, namesize)
 
   return getlogin_r_fd0 (name, namesize);
 }
-libc_hidden_def (getlogin_r)
+libc_hidden_def (__getlogin_r)
+weak_alias (__getlogin_r, getlogin_r)
+libc_hidden_weak (getlogin_r)