Remove --enable-obsolete-nsl configure flag

this means that *always* libnsl is only built as shared library for
backward compatibility and the NSS modules libnss_nis and libnss_nisplus
are not built at all, libnsl's headers aren't installed.

This compatibility is kept only for architectures and ABIs that have
been added in or before version 2.28.

Replacement implementations based on TIRPC, which additionally support
IPv6, are available from <https://github.com/thkukuk/>.

This change does not affect libnss_compat which does not depended
on libnsl since 2.27 and thus can be used without NIS.

libnsl code depends on Sun RPC, e.g. on --enable-obsolete-rpc (installed
libnsl headers use installed Sun RPC headers), which will be removed in
the following commit.

71 files changed, 48 insertions, 11162 deletions

diff --git a/INSTALL b/INSTALL
index 62e78725f5..3f5575e23e 100644
--- a/INSTALL
+++ b/INSTALL
@@ -227,15 +227,6 @@ if 'CFLAGS' is specified it must enable optimization.  For example:
           colon-separated list in a single environment variable
           'GLIBC_TUNABLES'.
 
-'--enable-obsolete-nsl'
-     By default, libnsl is only built as shared library for backward
-     compatibility and the NSS modules libnss_compat, libnss_nis and
-     libnss_nisplus are not built at all.  Use this option to enable
-     libnsl with all depending NSS modules and header files.  For
-     architectures and ABIs that have been added after version 2.28 of
-     the GNU C Library this option is not available, and the libnsl
-     compatibility library is not built.
-
 '--disable-crypt'
      Do not install the passphrase-hashing library 'libcrypt' or the
      header file 'crypt.h'.  'unistd.h' will still declare the function
diff --git a/NEWS b/NEWS
index 5083f5eacf..65e9999cc3 100644
--- a/NEWS
+++ b/NEWS
@@ -80,6 +80,16 @@ Major new features:
 
 Deprecated and removed features, and other changes affecting compatibility:
 
+* Remove configure option --enable-obsolete-nsl.  libnsl is only built
+  as shared library for backward compatibility and the NSS modules "nis"
+  and "nisplus" are not built at all and libnsl's headers aren't
+  installed.  This compatibility is kept only for architectures and ABIs
+  that have been added in or before version 2.28.  Replacement
+  implementations based on TI-RPC, which additionally support IPv6, are
+  available from <https://github.com/thkukuk/>.  This change does not
+  affect the "compat" NSS module, which does not depended on libnsl
+  since 2.27 and thus can be used without NIS.
+
 * The deprecated <sys/sysctl.h> header and the sysctl function have been
   removed.  To support old binaries, the sysctl function continues to
   exist as a compatibility symbol (on those architectures which had it),
@@ -115,11 +125,11 @@ Deprecated and removed features, and other changes affecting compatibility:
   or contents might be overwritten on subsequent calls in the same thread or
   if the thread is terminated.  It makes strerror MT-safe.
 
-* The "files", "nis" and "nisplus" NSS modules no longer supports the
-  "key" database (used for secure RPC).  The contents of the
-  /etc/publickey file will be ignored, regardless of the settings in
-  /etc/nsswitch.conf.  (This method of storing RPC keys only supported
-  the obsolete and insecure AUTH_DES flavor of secure RPC.)
+* The "files" NSS module no longer supports the "key" database (used for
+  secure RPC).  The contents of the /etc/publickey file will be ignored,
+  regardless of the settings in /etc/nsswitch.conf.  (This method of
+  storing RPC keys only supported the obsolete and insecure AUTH_DES
+  flavor of secure RPC.)
 
 Changes to build and runtime requirements:
 
diff --git a/config.h.in b/config.h.in
index 7921917ad2..d5e1f6819e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -167,10 +167,6 @@
    to link against.  */
 #undef LINK_OBSOLETE_RPC
 
-/* Define if obsolete libnsl code should be made available for user-level
-   code to link against.  */
-#undef LINK_OBSOLETE_NSL
-
 /* Define if Systemtap <sys/sdt.h> probes should be defined.  */
 #undef USE_STAP_PROBE
 
diff --git a/config.make.in b/config.make.in
index 2fed3da773..cefb6d4a90 100644
--- a/config.make.in
+++ b/config.make.in
@@ -97,7 +97,6 @@ build-static-nss = @static_nss@
 cross-compiling = @cross_compiling@
 force-install = @force_install@
 link-obsolete-rpc = @link_obsolete_rpc@
-build-obsolete-nsl = @build_obsolete_nsl@
 build-crypt = @build_crypt@
 build-nscd = @build_nscd@
 use-nscd = @use_nscd@
diff --git a/configure b/configure
index b8ef8c7a51..793c0068cc 100755
--- a/configure
+++ b/configure
@@ -673,7 +673,6 @@ base_machine
 have_tunables
 build_pt_chown
 build_nscd
-build_obsolete_nsl
 link_obsolete_rpc
 libc_cv_static_nss_crypt
 libc_cv_nss_crypt
@@ -786,7 +785,6 @@ enable_experimental_malloc
 enable_crypt
 enable_nss_crypt
 enable_obsolete_rpc
-enable_obsolete_nsl
 enable_systemtap
 enable_build_nscd
 enable_nscd
@@ -1459,8 +1457,6 @@ Optional Features:
   --enable-nss-crypt      enable libcrypt to use nss
   --enable-obsolete-rpc   build and install the obsolete RPC code for
                           link-time usage
-  --enable-obsolete-nsl   build and install the obsolete libnsl library and
-                          depending NSS modules
   --enable-systemtap      enable systemtap static probe points [default=no]
   --disable-build-nscd    disable building and installing the nscd daemon
   --disable-nscd          library functions will not contact the nscd daemon
@@ -3654,20 +3650,6 @@ if test "$link_obsolete_rpc" = yes; then
 
 fi
 
-# Check whether --enable-obsolete-nsl was given.
-if test "${enable_obsolete_nsl+set}" = set; then :
-  enableval=$enable_obsolete_nsl; build_obsolete_nsl=$enableval
-else
-  build_obsolete_nsl=no
-fi
-
-
-
-if test "$build_obsolete_nsl" = yes; then
-  $as_echo "#define LINK_OBSOLETE_NSL 1" >>confdefs.h
-
-fi
-
 # Check whether --enable-systemtap was given.
 if test "${enable_systemtap+set}" = set; then :
   enableval=$enable_systemtap; systemtap=$enableval
@@ -3785,7 +3767,7 @@ main ()
 {
 
 #ifndef __CET__
-#error no CET compiler support
+# error no CET compiler support
 #endif
   ;
   return 0;
diff --git a/configure.ac b/configure.ac
index ff00591fd4..33a1189804 100644
--- a/configure.ac
+++ b/configure.ac
@@ -387,17 +387,6 @@ if test "$link_obsolete_rpc" = yes; then
   AC_DEFINE(LINK_OBSOLETE_RPC)
 fi
 
-AC_ARG_ENABLE([obsolete-nsl],
-              AC_HELP_STRING([--enable-obsolete-nsl],
-                             [build and install the obsolete libnsl library and depending NSS modules]),
-              [build_obsolete_nsl=$enableval],
-              [build_obsolete_nsl=no])
-AC_SUBST(build_obsolete_nsl)
-
-if test "$build_obsolete_nsl" = yes; then
-  AC_DEFINE(LINK_OBSOLETE_NSL)
-fi
-
 AC_ARG_ENABLE([systemtap],
               [AS_HELP_STRING([--enable-systemtap],
 	       [enable systemtap static probe points @<:@default=no@:>@])