sys_utsname: Add support for Minix.

[gnulib.git] / m4 / inet_pton.m4

diff --git a/m4/inet_pton.m4 b/m4/inet_pton.m4
index 58f2c31..9fc64df 100644 (file)
--- a/m4/inet_pton.m4
+++ b/m4/inet_pton.m4
@@ -1,18 +1,47 @@
-# inet_pton.m4 serial 3
-dnl Copyright (C) 2006, 2008 Free Software Foundation, Inc.
+# inet_pton.m4 serial 13
+dnl Copyright (C) 2006, 2008-2011 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_INET_PTON],
+AC_DEFUN([gl_FUNC_INET_PTON],
 [
-  AC_REPLACE_FUNCS(inet_pton)
-  gl_PREREQ_INET_PTON
+  dnl Persuade Solaris <arpa/inet.h> to declare inet_pton.
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+  dnl Most platforms that provide inet_pton define it in libc.
+  dnl Solaris 8..10 provide inet_pton in libnsl instead.
+  HAVE_INET_PTON=1
+  gl_save_LIBS=$LIBS
+  AC_SEARCH_LIBS([inet_pton], [nsl], [],
+    [AC_CHECK_FUNCS([inet_pton])
+     if test $ac_cv_func_inet_pton = no; then
+       HAVE_INET_PTON=0
+     fi
+    ])
+  LIBS=$gl_save_LIBS
+
+  INET_PTON_LIB=
+  if test "$ac_cv_search_inet_pton" != "no" &&
+     test "$ac_cv_search_inet_pton" != "none required"; then
+    INET_PTON_LIB="$ac_cv_search_inet_pton"
+  fi
+  AC_SUBST([INET_PTON_LIB])
+
+  AC_CHECK_HEADERS_ONCE([netdb.h])
+  AC_CHECK_DECLS([inet_pton],,,
+    [#include <arpa/inet.h>
+     #if HAVE_NETDB_H
+     # include <netdb.h>
+     #endif
+    ])
+  if test $ac_cv_have_decl_inet_pton = no; then
+    HAVE_DECL_INET_PTON=0
+    AC_REQUIRE([AC_C_RESTRICT])
+  fi
 ])
 
 # Prerequisites of lib/inet_pton.c.
 AC_DEFUN([gl_PREREQ_INET_PTON], [
-  AC_CHECK_DECLS([inet_pton],,,[#include <arpa/inet.h>])
   AC_REQUIRE([gl_SOCKET_FAMILIES])
-  AC_REQUIRE([AC_C_RESTRICT])
 ])