NEWS.stable: log cherry-pick [e446f25]->[c092018] relocatable-shell: Update suggested...

[gnulib.git] / m4 / getdomainname.m4

diff --git a/m4/getdomainname.m4 b/m4/getdomainname.m4
index 744d646..0789568 100644 (file)
--- a/m4/getdomainname.m4
+++ b/m4/getdomainname.m4
@@ -1,20 +1,104 @@
-# getdomainname.m4 serial 1
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# getdomainname.m4 serial 10
+dnl Copyright (C) 2002-2003, 2008-2014 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_FUNC_GETDOMAINNAME],
 [
-  AC_REPLACE_FUNCS(getdomainname)
-  if test $ac_cv_func_getdomainname = no; then
-    gl_PREREQ_GETDOMAINNAME
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H
+  AC_REQUIRE([gl_HEADER_NETDB])dnl for HAVE_NETDB_H
+
+  dnl Persuade glibc <unistd.h> to declare getdomainname().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl Where is getdomainname() defined?
+  dnl - On Solaris, it is in libnsl. But this function is not declared and
+  dnl   is discouraged, see
+  dnl   <http://www.sun.com/software/solaris/programs/abi/appcert_faq.xml#q18>.
+  dnl   We need to avoid a collision with this function.
+  dnl - Otherwise it is in libc.
+  AC_CHECK_FUNCS([getdomainname], , [
+    AC_CACHE_CHECK([for getdomainname in -lnsl],
+      [gl_cv_func_getdomainname_in_libnsl],
+      [gl_cv_func_getdomainname_in_libnsl=no
+       gl_save_LIBS="$LIBS"
+       LIBS="$LIBS -lnsl"
+       AC_LINK_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[#include <stddef.h>
+              extern
+              #ifdef __cplusplus
+              "C"
+              #endif
+              int getdomainname (char *, size_t);
+            ]],
+            [[getdomainname(NULL, 0);]])],
+         [gl_cv_func_getdomainname_in_libnsl=yes])
+       LIBS="$gl_save_LIBS"
+      ])
+  ])
+
+  dnl What about the declaration?
+  dnl - It's  int getdomainname(char *, size_t)  on glibc, NetBSD, OpenBSD.
+  dnl - It's  int getdomainname(char *, int)  on Mac OS X, FreeBSD, AIX, IRIX,
+  dnl   OSF/1.
+  AC_CHECK_DECLS([getdomainname], , ,
+    [[#include <sys/types.h>
+      #ifdef HAVE_SYS_SOCKET_H
+      #include <sys/socket.h>
+      #endif
+      #ifdef HAVE_NETDB_H
+      #include <netdb.h>
+      #endif
+      #include <unistd.h>
+    ]])
+  AC_CACHE_CHECK([for getdomainname's second argument type],
+    [gl_cv_decl_getdomainname_argtype2],
+    [if test $ac_cv_have_decl_getdomainname; then
+       AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[#include <sys/types.h>
+              #ifdef HAVE_SYS_SOCKET_H
+              #include <sys/socket.h>
+              #endif
+              #ifdef HAVE_NETDB_H
+              #include <netdb.h>
+              #endif
+              #include <unistd.h>
+              extern
+              #ifdef __cplusplus
+              "C"
+              #endif
+              int getdomainname (char *, int);
+            ]],
+            [[]])],
+         [gl_cv_decl_getdomainname_argtype2='int'],
+         [gl_cv_decl_getdomainname_argtype2='size_t'])
+     else
+       gl_cv_decl_getdomainname_argtype2='int'
+     fi
+    ])
+
+  if test $ac_cv_have_decl_getdomainname = no; then
+    HAVE_DECL_GETDOMAINNAME=0
+  fi
+
+  if { test $ac_cv_func_getdomainname = yes \
+       && test $gl_cv_decl_getdomainname_argtype2 != size_t; \
+     } \
+     || test "$gl_cv_func_getdomainname_in_libnsl" = yes; then
+    REPLACE_GETDOMAINNAME=1
   fi
 ])
 
 # Prerequisites of lib/getdomainname.c.
 AC_DEFUN([gl_PREREQ_GETDOMAINNAME], [
-  :
+  if test $ac_cv_func_getdomainname = yes; then
+    AC_DEFINE([HAVE_GETDOMAINNAME], [1],
+      [Define if the getdomainname() function is present and can be used.])
+  fi
+  AC_CHECK_HEADERS([sys/systeminfo.h])
+  AC_CHECK_FUNCS([sysinfo])
 ])