https://github.com/archlinuxarm/PKGBUILDs/issues/296

Fixes the bug causing a segfault on nscd and sshd:
symbol lookup error: /usr/lib/libnss_ldap.so.2: undefined symbol: __libc_lock_lock

--- ldap-nss.c.orig	2012-10-17 12:32:03.908730283 +0000
+++ ldap-nss.c	2012-10-17 12:38:10.906767283 +0000
@@ -148,7 +148,7 @@
  */
 static ldap_session_t __session = { NULL, NULL, 0, LS_UNINITIALIZED };
 
-#if defined(HAVE_PTHREAD_ATFORK) || defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#if defined(HAVE_PTHREAD_ATFORK) || defined(HAVE___LIBC_ONCE)
 static pthread_once_t __once = PTHREAD_ONCE_INIT;
 #endif
 
@@ -168,7 +168,7 @@
 static int __ssl_initialized = 0;
 #endif /* HAVE_LDAPSSL_CLIENT_INIT */
 
-#if defined(HAVE_PTHREAD_ATFORK) || defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#if defined(HAVE_PTHREAD_ATFORK) || defined(HAVE___LIBC_ONCE)
 /*
  * Prepare for fork(); lock mutex.
  */
@@ -519,7 +519,7 @@
 }
 #endif /* HAVE_NSSWITCH_H */
 
-#if defined(HAVE_PTHREAD_ATFORK) || defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#if defined(HAVE_PTHREAD_ATFORK) || defined(HAVE___LIBC_ONCE)
 static void
 do_atfork_prepare (void)
 {
@@ -553,7 +553,7 @@
 #ifdef HAVE_PTHREAD_ATFORK
   (void) pthread_atfork (do_atfork_prepare, do_atfork_parent,
 			 do_atfork_child);
-#elif defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#elif defined(HAVE___LIBC_ATFORK)
   (void) __libc_atfork (do_atfork_prepare, do_atfork_parent, do_atfork_child);
 #endif
 
@@ -1119,7 +1119,7 @@
     }
 
 #ifndef HAVE_PTHREAD_ATFORK
-#if defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#if defined(HAVE___LIBC_ONCE)
   /*
    * This bogosity is necessary because Linux uses different
    * PIDs for different threads (like IRIX, which we don't
@@ -1151,7 +1151,7 @@
     pid = -1;			/* linked against libpthreads, don't care */
 #else
   pid = getpid ();
-#endif /* HAVE_LIBC_LOCK_H || HAVE_BITS_LIBC_LOCK_H */
+#endif /* HAVE___LIBC_ONCE */
 #endif /* HAVE_PTHREAD_ATFORK */
 
   euid = geteuid ();
@@ -1161,7 +1161,7 @@
   syslog (LOG_DEBUG,
 	  "nss_ldap: __session.ls_state=%d, __session.ls_conn=%p, __euid=%i, euid=%i",
 	  __session.ls_state, __session.ls_conn, __euid, euid);
-#elif defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#elif defined(HAVE___LIBC_ONCE)
   syslog (LOG_DEBUG,
 	  "nss_ldap: libpthreads=%s, __session.ls_state=%d, __session.ls_conn=%p, __pid=%i, pid=%i, __euid=%i, euid=%i",
  	  ((__pthread_once == NULL || __pthread_atfork == NULL) ? "FALSE" : "TRUE"),
@@ -1185,11 +1185,11 @@
     }
   else
 #ifndef HAVE_PTHREAD_ATFORK
-#if defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#if defined(HAVE___LIBC_ONCE)
   if ((__pthread_once == NULL || __pthread_atfork == NULL) && __pid != pid)
 #else
   if (__pid != pid)
-#endif /* HAVE_LIBC_LOCK_H || HAVE_BITS_LIBC_LOCK_H */
+#endif /* HAVE___LIBC_ONCE */
     {
       do_close_no_unbind ();
     }
@@ -1250,9 +1250,9 @@
       debug ("<== do_init (pthread_once failed)");
       return NSS_UNAVAIL;
     }
-#elif defined(HAVE_PTHREAD_ATFORK) && ( defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H) )
+#elif defined(HAVE_PTHREAD_ATFORK) && defined(HAVE___LIBC_ONCE)
   __libc_once (__once, do_atfork_setup);
-#elif defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#elif defined(HAVE___LIBC_ONCE)
   /*
    * Only install the pthread_atfork() handlers i
    * we are linked against libpthreads. Otherwise,
--- ldap-nss.h.orig	2012-10-17 12:33:05.681379283 +0000
+++ ldap-nss.h	2012-10-17 12:34:06.337050753 +0000
@@ -671,7 +671,7 @@
 #define NSS_LDAP_LOCK(m)		mutex_lock(&m)
 #define NSS_LDAP_UNLOCK(m)		mutex_unlock(&m)
 #define NSS_LDAP_DEFINE_LOCK(m)		static mutex_t m = DEFAULTMUTEX
-#elif defined(HAVE_LIBC_LOCK_H) || defined(HAVE_BITS_LIBC_LOCK_H)
+#elif defined(HAVE___LIBC_LOCK_LOCK) && defined(HAVE___LIBC_LOCK_UNLOCK)
 #define NSS_LDAP_LOCK(m)		__libc_lock_lock(m)
 #define NSS_LDAP_UNLOCK(m)		__libc_lock_unlock(m)
 #define NSS_LDAP_DEFINE_LOCK(m)		static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER
--- ldap-nss.c.orig	2012-10-17 12:58:20.270783283 +0000
+++ ldap-nss.c	2012-10-17 12:58:43.699267283 +0000
@@ -156,7 +156,7 @@
 static FILE *__debugfile;
 #endif /* LBER_OPT_LOG_PRINT_FILE */
 
-#ifndef HAVE_PTHREAD_ATFORK
+#if !defined(HAVE_PTHREAD_ATFORK) || !defined(HAVE___LIBC_ONCE)
 /* 
  * Process ID that opened the session.
  */
--- configure.in.orig	2012-10-17 12:59:31.707235283 +0000
+++ configure.in	2012-10-17 13:00:15.854289283 +0000
@@ -255,6 +255,7 @@
 AC_CHECK_FUNCS(pthread_once)
 AC_CHECK_FUNCS(ether_aton)
 AC_CHECK_FUNCS(ether_ntoa)
+AC_CHECK_FUNCS(__libc_once __libc_atfork __libc_lock_lock __libc_lock_unlock)
 
 AC_MSG_CHECKING(for struct ether_addr)
 AC_TRY_COMPILE([#include <sys/types.h>
--- ldap-nss.c.orig	2012-10-17 13:02:01.418010283 +0000
+++ ldap-nss.c	2012-10-17 13:03:25.017240283 +0000
@@ -1102,7 +1102,7 @@
 do_init (void)
 {
   ldap_config_t *cfg;
-#ifndef HAVE_PTHREAD_ATFORK
+#if !defined(HAVE_PTHREAD_ATFORK) || !defined(HAVE___LIBC_ONCE)
   pid_t pid;
 #endif
   uid_t euid;