commit 78a90c2f74a2012dd3eff302189e47ff6779a757
Author: Andreas Schwab <schwab@linux-m68k.org>
Date:   Fri Mar 2 23:07:14 2018 +0100

    Fix multiple definitions of __nss_*_database (bug 22918)
    
    (cherry picked from commit eaf6753f8aac33a36deb98c1031d1bad7b593d2d)

diff --git a/nscd/gai.c b/nscd/gai.c
index d081747797..576fd0045b 100644
--- a/nscd/gai.c
+++ b/nscd/gai.c
@@ -45,3 +45,6 @@
 #ifdef HAVE_LIBIDN
 # include <libidn/idn-stub.c>
 #endif
+
+/* Some variables normally defined in libc.  */
+service_user *__nss_hosts_database attribute_hidden;
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index d5e655974f..b0f0c11a3e 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -62,7 +62,7 @@ static service_library *nss_new_service (name_database *database,
 
 /* Declare external database variables.  */
 #define DEFINE_DATABASE(name)						      \
-  extern service_user *__nss_##name##_database attribute_hidden;	      \
+  service_user *__nss_##name##_database attribute_hidden;		      \
   weak_extern (__nss_##name##_database)
 #include "databases.def"
 #undef DEFINE_DATABASE
diff --git a/nss/nsswitch.h b/nss/nsswitch.h
index eccb535ef5..63573b9ebc 100644
--- a/nss/nsswitch.h
+++ b/nss/nsswitch.h
@@ -226,10 +226,10 @@ libc_hidden_proto (__nss_hostname_digits_dots)
 #define MAX_NR_ADDRS    48
 
 /* Prototypes for __nss_*_lookup2 functions.  */
-#define DEFINE_DATABASE(arg)				    \
-  service_user *__nss_##arg##_database attribute_hidden;    \
-  int __nss_##arg##_lookup2 (service_user **, const char *, \
-			     const char *, void **);	    \
+#define DEFINE_DATABASE(arg)						      \
+  extern service_user *__nss_##arg##_database attribute_hidden;		      \
+  int __nss_##arg##_lookup2 (service_user **, const char *,		      \
+			     const char *, void **);			      \
   libc_hidden_proto (__nss_##arg##_lookup2)
 #include "databases.def"
 #undef DEFINE_DATABASE
diff --git a/posix/tst-rfc3484-2.c b/posix/tst-rfc3484-2.c
index f509534ca9..8c64ac59ff 100644
--- a/posix/tst-rfc3484-2.c
+++ b/posix/tst-rfc3484-2.c
@@ -58,6 +58,7 @@ _res_hconf_init (void)
 #undef	USE_NSCD
 #include "../sysdeps/posix/getaddrinfo.c"
 
+service_user *__nss_hosts_database attribute_hidden;
 
 /* This is the beginning of the real test code.  The above defines
    (among other things) the function rfc3484_sort.  */
diff --git a/posix/tst-rfc3484-3.c b/posix/tst-rfc3484-3.c
index ae44087a10..1c61aaf844 100644
--- a/posix/tst-rfc3484-3.c
+++ b/posix/tst-rfc3484-3.c
@@ -58,6 +58,7 @@ _res_hconf_init (void)
 #undef	USE_NSCD
 #include "../sysdeps/posix/getaddrinfo.c"
 
+service_user *__nss_hosts_database attribute_hidden;
 
 /* This is the beginning of the real test code.  The above defines
    (among other things) the function rfc3484_sort.  */
diff --git a/posix/tst-rfc3484.c b/posix/tst-rfc3484.c
index 7f191abbbc..8f45848e44 100644
--- a/posix/tst-rfc3484.c
+++ b/posix/tst-rfc3484.c
@@ -58,6 +58,7 @@ _res_hconf_init (void)
 #undef	USE_NSCD
 #include "../sysdeps/posix/getaddrinfo.c"
 
+service_user *__nss_hosts_database attribute_hidden;
 
 /* This is the beginning of the real test code.  The above defines
    (among other things) the function rfc3484_sort.  */