move reentrant.m4 to the m4 subdirectory to avoid infinite loop inclusion problem

1 files changed, 1052 insertions, 0 deletions

diff --git a/m4/reentrant.m4 b/m4/reentrant.m4
new file mode 100644
index 000000000..953a1ba7d
--- /dev/null
+++ b/m4/reentrant.m4
@@ -0,0 +1,1052 @@
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at http://curl.haxx.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+# $Id$
+###########################################################################
+
+
+dnl CHECK_NEED_REENTRANT_STRERROR_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function strerror_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_STRERROR_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([strerror_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: strerror_r links... yes])
+    tmp_strerror_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: strerror_r links... no])
+    tmp_strerror_r="no"
+  ])
+  #
+  if test "$tmp_strerror_r" = "yes"; then
+    AC_EGREP_CPP([strerror_r],[
+#include <sys/types.h>
+#include <string.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: strerror_r proto... without our definition])
+      tmp_strerror_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([strerror_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <string.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: strerror_r proto... with our _reentrant])
+        tmp_strerror_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: strerror_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_strerror_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <string.h>
+      ]],[[
+        strerror_r(0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: strerror_r proto wout finds... 3 args])
+      tmp_strerror_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_strerror_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <string.h>
+      ]],[[
+        strerror_r(0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: strerror_r proto with finds... 3 args])
+      tmp_strerror_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_strerror_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_STRTOK_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function strtok_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_STRTOK_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([strtok_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: strtok_r links... yes])
+    tmp_strtok_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: strtok_r links... no])
+    tmp_strtok_r="no"
+  ])
+  #
+  if test "$tmp_strtok_r" = "yes"; then
+    AC_EGREP_CPP([strtok_r],[
+#include <sys/types.h>
+#include <string.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: strtok_r proto... without our definition])
+      tmp_strtok_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([strtok_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <string.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: strtok_r proto... with our _reentrant])
+        tmp_strtok_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: strtok_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_strtok_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <string.h>
+      ]],[[
+        strtok_r(0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: strtok_r proto wout finds... 3 args])
+      tmp_strtok_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_strtok_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <string.h>
+      ]],[[
+        strtok_r(0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: strtok_r proto with finds... 3 args])
+      tmp_strtok_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_strtok_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_LOCALTIME_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function localtime_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_LOCALTIME_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([localtime_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: localtime_r links... yes])
+    tmp_localtime_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: localtime_r links... no])
+    tmp_localtime_r="no"
+  ])
+  #
+  if test "$tmp_localtime_r" = "yes"; then
+    AC_EGREP_CPP([localtime_r],[
+#include <sys/types.h>
+#include <time.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: localtime_r proto... without our definition])
+      tmp_localtime_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([localtime_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <time.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: localtime_r proto... with our _reentrant])
+        tmp_localtime_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: localtime_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_localtime_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <time.h>
+      ]],[[
+        localtime_r(0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: localtime_r proto wout finds... 2 args])
+      tmp_localtime_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_localtime_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <time.h>
+      ]],[[
+        localtime_r(0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: localtime_r proto with finds... 2 args])
+      tmp_localtime_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_localtime_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_GMTIME_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function gmtime_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_GMTIME_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([gmtime_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: gmtime_r links... yes])
+    tmp_gmtime_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: gmtime_r links... no])
+    tmp_gmtime_r="no"
+  ])
+  #
+  if test "$tmp_gmtime_r" = "yes"; then
+    AC_EGREP_CPP([gmtime_r],[
+#include <sys/types.h>
+#include <time.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: gmtime_r proto... without our definition])
+      tmp_gmtime_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([gmtime_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <time.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: gmtime_r proto... with our _reentrant])
+        tmp_gmtime_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: gmtime_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_gmtime_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <time.h>
+      ]],[[
+        gmtime_r(0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gmtime_r proto wout finds... 2 args])
+      tmp_gmtime_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_gmtime_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <time.h>
+      ]],[[
+        gmtime_r(0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gmtime_r proto with finds... 2 args])
+      tmp_gmtime_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_gmtime_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_INET_NTOA_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function inet_ntoa_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_INET_NTOA_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([inet_ntoa_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: inet_ntoa_r links... yes])
+    tmp_inet_ntoa_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: inet_ntoa_r links... no])
+    tmp_inet_ntoa_r="no"
+  ])
+  #
+  if test "$tmp_inet_ntoa_r" = "yes"; then
+    AC_EGREP_CPP([inet_ntoa_r],[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto... without our definition])
+      tmp_inet_ntoa_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([inet_ntoa_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto... with our _reentrant])
+        tmp_inet_ntoa_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_inet_ntoa_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+      ]],[[
+        struct in_addr addr;
+        inet_ntoa_r(addr, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto wout finds... 2 args])
+      tmp_inet_ntoa_r="done"
+    ])
+  fi
+  if test "$tmp_inet_ntoa_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+      ]],[[
+        struct in_addr addr;
+        inet_ntoa_r(addr, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto wout finds... 3 args])
+      tmp_inet_ntoa_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_inet_ntoa_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+      ]],[[
+        struct in_addr addr;
+        inet_ntoa_r(addr, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto with finds... 2 args])
+      tmp_inet_ntoa_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_inet_ntoa_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+      ]],[[
+        struct in_addr addr;
+        inet_ntoa_r(addr, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: inet_ntoa_r proto with finds... 3 args])
+      tmp_inet_ntoa_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_inet_ntoa_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_GETHOSTBYADDR_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function gethostbyaddr_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_GETHOSTBYADDR_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([gethostbyaddr_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: gethostbyaddr_r links... yes])
+    tmp_gethostbyaddr_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: gethostbyaddr_r links... no])
+    tmp_gethostbyaddr_r="no"
+  ])
+  #
+  if test "$tmp_gethostbyaddr_r" = "yes"; then
+    AC_EGREP_CPP([gethostbyaddr_r],[
+#include <sys/types.h>
+#include <netdb.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto... without our definition])
+      tmp_gethostbyaddr_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([gethostbyaddr_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto... with our _reentrant])
+        tmp_gethostbyaddr_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_gethostbyaddr_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyaddr_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto wout finds... 5 args])
+      tmp_gethostbyaddr_r="done"
+    ])
+  fi
+  if test "$tmp_gethostbyaddr_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto wout finds... 7 args])
+      tmp_gethostbyaddr_r="done"
+    ])
+  fi
+  if test "$tmp_gethostbyaddr_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto wout finds... 8 args])
+      tmp_gethostbyaddr_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_gethostbyaddr_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyaddr_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto with finds... 5 args])
+      tmp_gethostbyaddr_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_gethostbyaddr_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto with finds... 7 args])
+      tmp_gethostbyaddr_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_gethostbyaddr_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyaddr_r proto with finds... 8 args])
+      tmp_gethostbyaddr_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_gethostbyaddr_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_GETHOSTBYNAME_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function gethostbyname_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_GETHOSTBYNAME_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([gethostbyname_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: gethostbyname_r links... yes])
+    tmp_gethostbyname_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: gethostbyname_r links... no])
+    tmp_gethostbyname_r="no"
+  ])
+  #
+  if test "$tmp_gethostbyname_r" = "yes"; then
+    AC_EGREP_CPP([gethostbyname_r],[
+#include <sys/types.h>
+#include <netdb.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto... without our definition])
+      tmp_gethostbyname_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([gethostbyname_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: gethostbyname_r proto... with our _reentrant])
+        tmp_gethostbyname_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: gethostbyname_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_gethostbyname_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyname_r(0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto wout finds... 3 args])
+      tmp_gethostbyname_r="done"
+    ])
+  fi
+  if test "$tmp_gethostbyname_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyname_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto wout finds... 5 args])
+      tmp_gethostbyname_r="done"
+    ])
+  fi
+  if test "$tmp_gethostbyname_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyname_r(0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto wout finds... 6 args])
+      tmp_gethostbyname_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_gethostbyname_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyname_r(0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto with finds... 3 args])
+      tmp_gethostbyname_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_gethostbyname_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyname_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto with finds... 5 args])
+      tmp_gethostbyname_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_gethostbyname_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        gethostbyname_r(0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: gethostbyname_r proto with finds... 6 args])
+      tmp_gethostbyname_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_gethostbyname_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_GETPROTOBYNAME_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function getprotobyname_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_GETPROTOBYNAME_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([getprotobyname_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: getprotobyname_r links... yes])
+    tmp_getprotobyname_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: getprotobyname_r links... no])
+    tmp_getprotobyname_r="no"
+  ])
+  #
+  if test "$tmp_getprotobyname_r" = "yes"; then
+    AC_EGREP_CPP([getprotobyname_r],[
+#include <sys/types.h>
+#include <netdb.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: getprotobyname_r proto... without our definition])
+      tmp_getprotobyname_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([getprotobyname_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: getprotobyname_r proto... with our _reentrant])
+        tmp_getprotobyname_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: getprotobyname_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_getprotobyname_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getprotobyname_r(0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getprotobyname_r proto wout finds... 4 args])
+      tmp_getprotobyname_r="done"
+    ])
+  fi
+  if test "$tmp_getprotobyname_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getprotobyname_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getprotobyname_r proto wout finds... 5 args])
+      tmp_getprotobyname_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_getprotobyname_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getprotobyname_r(0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getprotobyname_r proto with finds... 4 args])
+      tmp_getprotobyname_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_getprotobyname_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getprotobyname_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getprotobyname_r proto with finds... 5 args])
+      tmp_getprotobyname_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_getprotobyname_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_GETSERVBYPORT_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes function getservbyport_r compiler visible.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_GETSERVBYPORT_R], [
+  #
+  AC_MSG_NOTICE([DEBUG:])
+  AC_LINK_IFELSE([
+    AC_LANG_FUNC_LINK_TRY([getservbyport_r])
+  ],[
+    AC_MSG_NOTICE([DEBUG: getservbyport_r links... yes])
+    tmp_getservbyport_r="yes"
+  ],[
+    AC_MSG_NOTICE([DEBUG: getservbyport_r links... no])
+    tmp_getservbyport_r="no"
+  ])
+  #
+  if test "$tmp_getservbyport_r" = "yes"; then
+    AC_EGREP_CPP([getservbyport_r],[
+#include <sys/types.h>
+#include <netdb.h>
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto... without our definition])
+      tmp_getservbyport_r="proto_wout_def"
+    ],[
+      AC_EGREP_CPP([getservbyport_r],[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ],[
+        AC_MSG_NOTICE([DEBUG: getservbyport_r proto... with our _reentrant])
+        tmp_getservbyport_r="proto_with_def"
+      ],[
+        AC_MSG_NOTICE([DEBUG: getservbyport_r proto... not found])
+      ])
+    ])
+  fi
+  #
+  if test "$tmp_getservbyport_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getservbyport_r(0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto wout finds... 4 args])
+      tmp_getservbyport_r="done"
+    ])
+  fi
+  if test "$tmp_getservbyport_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getservbyport_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto wout finds... 5 args])
+      tmp_getservbyport_r="done"
+    ])
+  fi
+  if test "$tmp_getservbyport_r" = "proto_wout_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getservbyport_r(0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto wout finds... 6 args])
+      tmp_getservbyport_r="done"
+    ])
+  fi
+  #
+  if test "$tmp_getservbyport_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getservbyport_r(0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto with finds... 4 args])
+      tmp_getservbyport_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_getservbyport_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getservbyport_r(0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto with finds... 5 args])
+      tmp_getservbyport_r="needs_reentrant"
+    ])
+  fi
+  if test "$tmp_getservbyport_r" = "proto_with_def"; then
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([[
+#define _REENTRANT
+#include <sys/types.h>
+#include <netdb.h>
+      ]],[[
+        getservbyport_r(0, 0, 0, 0, 0, 0);
+      ]])
+    ],[
+      AC_MSG_NOTICE([DEBUG: getservbyport_r proto with finds... 6 args])
+      tmp_getservbyport_r="needs_reentrant"
+    ])
+  fi
+  #
+  if test "$tmp_getservbyport_r" = "needs_reentrant"; then
+    ac_cv_need_reentrant="yes"
+  fi
+])
+
+
+dnl CHECK_NEED_REENTRANT_FUNCTIONS_R
+dnl -------------------------------------------------
+dnl Checks if the preprocessor _REENTRANT definition
+dnl makes several _r functions compiler visible.
+dnl Internal macro for CONFIGURE_REENTRANT.
+
+AC_DEFUN([CHECK_NEED_REENTRANT_FUNCTIONS_R], [
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_STRERROR_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_STRTOK_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_LOCALTIME_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_GMTIME_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_INET_NTOA_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_GETHOSTBYADDR_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_GETHOSTBYNAME_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_GETPROTOBYNAME_R
+  fi
+  if test "$ac_cv_need_reentrant" = "no"; then
+    CHECK_NEED_REENTRANT_GETSERVBYPORT_R
+  fi
+])
+
+AC_DEFUN([CHECK_NEED_REENTRANT_FUNCTIONS_R_DEBUG], [
+    CHECK_NEED_REENTRANT_STRERROR_R
+    CHECK_NEED_REENTRANT_STRTOK_R
+    CHECK_NEED_REENTRANT_LOCALTIME_R
+    CHECK_NEED_REENTRANT_GMTIME_R
+    CHECK_NEED_REENTRANT_INET_NTOA_R
+    CHECK_NEED_REENTRANT_GETHOSTBYADDR_R
+    CHECK_NEED_REENTRANT_GETHOSTBYNAME_R
+    CHECK_NEED_REENTRANT_GETPROTOBYNAME_R
+    CHECK_NEED_REENTRANT_GETSERVBYPORT_R
+])
+
+
+dnl CONFIGURE_FROM_NOW_ON_WITH_REENTRANT
+dnl -------------------------------------------------
+dnl This macro ensures that configuration tests done
+dnl after this will execute with preprocessor symbol
+dnl _REENTRANT defined. This macro also ensures that
+dnl the generated config file will equally define it.
+dnl Internal macro for CONFIGURE_REENTRANT.
+
+AC_DEFUN([CONFIGURE_FROM_NOW_ON_WITH_REENTRANT], [
+AH_VERBATIM([NEED_REENTRANT],
+[/* Configure process defines NEED_REENTRANT to 1 when it finds out that */
+/* _REENTRANT is required or already defined for proper configuration.  */
+@%:@undef NEED_REENTRANT
+@%:@if defined(NEED_REENTRANT) && !defined(_REENTRANT)
+@%:@ define _REENTRANT
+@%:@endif])
+cat >>confdefs.h <<_ACEOF
+[@%:@ifndef _REENTRANT
+@%:@ define _REENTRANT
+@%:@endif]
+_ACEOF
+AC_DEFINE(NEED_REENTRANT, 1, [])
+])
+
+
+dnl CONFIGURE_REENTRANT
+dnl -------------------------------------------------
+dnl This first checks if the preprocessor _REENTRANT
+dnl symbol is already defined. If it isn't currently
+dnl defined a set of checks are performed to verify
+dnl if its definition is required to make visible to
+dnl the compiler a set of *_r functions. Finally, if
+dnl _REENTRANT is already defined or needed it takes
+dnl care of making adjustments necessary to ensure
+dnl that it is defined equally for further configure
+dnl tests and generated config file.
+
+AC_DEFUN([CONFIGURE_REENTRANT], [
+  #
+  AC_MSG_CHECKING([if _REENTRANT is already defined])
+  AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[
+    ]],[[
+#ifdef _REENTRANT
+      int dummy=1;
+#else
+      force compilation error
+#endif
+    ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    tmp_reentrant_initially_defined="yes"
+  ],[
+    AC_MSG_RESULT([no])
+    tmp_reentrant_initially_defined="no"
+  ])
+  #
+  if test "$tmp_reentrant_initially_defined" = "no"; then
+    AC_MSG_CHECKING([if _REENTRANT is actually needed])
+    ac_cv_need_reentrant="no"
+    CHECK_NEED_REENTRANT_FUNCTIONS_R_DEBUG
+    if test "$ac_cv_need_reentrant" = "yes"; then
+      AC_MSG_RESULT([yes])
+    else
+      AC_MSG_RESULT([no])
+    fi
+  fi
+  #
+  AC_MSG_CHECKING([if _REENTRANT is onwards defined])
+  if test "$tmp_reentrant_initially_defined" = "yes" ||
+    test "$ac_cv_need_reentrant" = "yes"; then
+    CONFIGURE_FROM_NOW_ON_WITH_REENTRANT
+    AC_MSG_RESULT([yes])
+  else
+    AC_MSG_RESULT([no])
+  fi
+  #
+])
+