Fix multiple definitions of __nss_*_database (bug 22918)

  [BZ #22918]
	* nss/nsswitch.h (DEFINE_DATABASE): Don't define __nss_*_database.
	* nss/nsswitch.c (DEFINE_DATABASE): Define __nss_*_database here.
	* nscd/gai.c (__nss_hosts_database): Readd definition.
	* posix/tst-rfc3484.c (__nss_hosts_database): Likewise.
	* posix/tst-rfc3484-3.c (__nss_hosts_database): Likewise.
	* posix/tst-rfc3484-2.c (__nss_hosts_database): Likewise.
---
 nscd/gai.c            | 3 +++
 nss/nsswitch.c        | 2 +-
 nss/nsswitch.h        | 8 ++++----
 posix/tst-rfc3484-2.c | 1 +
 posix/tst-rfc3484-3.c | 1 +
 posix/tst-rfc3484.c   | 1 +
 6 files changed, 11 insertions(+), 5 deletions(-)
  

On 03/03/2018 07:51 AM, Andreas Schwab wrote:
> 	[BZ #22918]
> 	* nss/nsswitch.h (DEFINE_DATABASE): Don't define __nss_*_database.
> 	* nss/nsswitch.c (DEFINE_DATABASE): Define __nss_*_database here.
> 	* nscd/gai.c (__nss_hosts_database): Readd definition.
> 	* posix/tst-rfc3484.c (__nss_hosts_database): Likewise.
> 	* posix/tst-rfc3484-3.c (__nss_hosts_database): Likewise.
> 	* posix/tst-rfc3484-2.c (__nss_hosts_database): Likewise.

LGTM.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

> ---
>  nscd/gai.c            | 3 +++
>  nss/nsswitch.c        | 2 +-
>  nss/nsswitch.h        | 8 ++++----
>  posix/tst-rfc3484-2.c | 1 +
>  posix/tst-rfc3484-3.c | 1 +
>  posix/tst-rfc3484.c   | 1 +
>  6 files changed, 11 insertions(+), 5 deletions(-)
> 
> 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 4b8deedabf..ee46f24424 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.  */
>