acinclude.m4

#***************************************************************************
#                                  _   _ ____  _
#  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 CURL_CHECK_HEADER_WINDOWS
dnl -------------------------------------------------
dnl Check for compilable and valid windows.h header 

AC_DEFUN([CURL_CHECK_HEADER_WINDOWS], [
  AC_CACHE_CHECK([for windows.h], [ac_cv_header_windows_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
      ]],[[
#if defined(__CYGWIN__) || defined(__CEGCC__)
        HAVE_WINDOWS_H shall not be defined.
#else
        int dummy=2*WINVER;
#endif
      ]])
    ],[
      ac_cv_header_windows_h="yes"
    ],[
      ac_cv_header_windows_h="no"
    ])
  ])
  case "$ac_cv_header_windows_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_WINDOWS_H, 1,
        [Define to 1 if you have the windows.h header file.])
      AC_DEFINE_UNQUOTED(WIN32_LEAN_AND_MEAN, 1,
        [Define to avoid automatic inclusion of winsock.h])
      ;;
  esac
])


dnl CURL_CHECK_NATIVE_WINDOWS
dnl -------------------------------------------------
dnl Check if building a native Windows target

AC_DEFUN([CURL_CHECK_NATIVE_WINDOWS], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([whether build target is a native Windows one], [ac_cv_native_windows], [
    if test "$ac_cv_header_windows_h" = "no"; then
      ac_cv_native_windows="no"
    else
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
        ]],[[
#if defined(__MINGW32__) || defined(__MINGW32CE__) || \
   (defined(_MSC_VER) && (defined(_WIN32) || defined(_WIN64)))
          int dummy=1;
#else
          Not a native Windows build target.
#endif
        ]])
      ],[
        ac_cv_native_windows="yes"
      ],[
        ac_cv_native_windows="no"
      ])
    fi
  ])
  case "$ac_cv_native_windows" in
    yes)
      AC_DEFINE_UNQUOTED(NATIVE_WINDOWS, 1,
        [Define to 1 if you are building a native Windows target.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_WINSOCK
dnl -------------------------------------------------
dnl Check for compilable and valid winsock.h header 

AC_DEFUN([CURL_CHECK_HEADER_WINSOCK], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([for winsock.h], [ac_cv_header_winsock_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock.h>
      ]],[[
#if defined(__CYGWIN__) || defined(__CEGCC__)
        HAVE_WINSOCK_H shall not be defined.
#else
        int dummy=WSACleanup();
#endif
      ]])
    ],[
      ac_cv_header_winsock_h="yes"
    ],[
      ac_cv_header_winsock_h="no"
    ])
  ])
  case "$ac_cv_header_winsock_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_WINSOCK_H, 1,
        [Define to 1 if you have the winsock.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_WINSOCK2
dnl -------------------------------------------------
dnl Check for compilable and valid winsock2.h header 

AC_DEFUN([CURL_CHECK_HEADER_WINSOCK2], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([for winsock2.h], [ac_cv_header_winsock2_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock2.h>
      ]],[[
#if defined(__CYGWIN__) || defined(__CEGCC__) || defined(__MINGW32CE__)
        HAVE_WINSOCK2_H shall not be defined.
#else
        int dummy=2*IPPROTO_ESP;
#endif
      ]])
    ],[
      ac_cv_header_winsock2_h="yes"
    ],[
      ac_cv_header_winsock2_h="no"
    ])
  ])
  case "$ac_cv_header_winsock2_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_WINSOCK2_H, 1,
        [Define to 1 if you have the winsock2.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_WS2TCPIP
dnl -------------------------------------------------
dnl Check for compilable and valid ws2tcpip.h header

AC_DEFUN([CURL_CHECK_HEADER_WS2TCPIP], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINSOCK2])dnl
  AC_CACHE_CHECK([for ws2tcpip.h], [ac_cv_header_ws2tcpip_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
      ]],[[
#if defined(__CYGWIN__) || defined(__CEGCC__) || defined(__MINGW32CE__)
        HAVE_WS2TCPIP_H shall not be defined.
#else
        int dummy=2*IP_PKTINFO;
#endif
      ]])
    ],[
      ac_cv_header_ws2tcpip_h="yes"
    ],[
      ac_cv_header_ws2tcpip_h="no"
    ])
  ])
  case "$ac_cv_header_ws2tcpip_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_WS2TCPIP_H, 1,
        [Define to 1 if you have the ws2tcpip.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_WINLDAP
dnl -------------------------------------------------
dnl Check for compilable and valid winldap.h header

AC_DEFUN([CURL_CHECK_HEADER_WINLDAP], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([for winldap.h], [ac_cv_header_winldap_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#endif
#include <winldap.h>
      ]],[[
#if defined(__CYGWIN__) || defined(__CEGCC__)
        HAVE_WINLDAP_H shall not be defined.
#else
        LDAP *ldp = ldap_init("dummy", LDAP_PORT);
        ULONG res = ldap_unbind(ldp);
#endif
      ]])
    ],[
      ac_cv_header_winldap_h="yes"
    ],[
      ac_cv_header_winldap_h="no"
    ])
  ])
  case "$ac_cv_header_winldap_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_WINLDAP_H, 1,
        [Define to 1 if you have the winldap.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_WINBER
dnl -------------------------------------------------
dnl Check for compilable and valid winber.h header

AC_DEFUN([CURL_CHECK_HEADER_WINBER], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINLDAP])dnl
  AC_CACHE_CHECK([for winber.h], [ac_cv_header_winber_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#endif
#include <winldap.h>
#include <winber.h>
      ]],[[
#if defined(__CYGWIN__) || defined(__CEGCC__)
        HAVE_WINBER_H shall not be defined.
#else
        BERVAL *bvp = NULL;
        BerElement *bep = ber_init(bvp);
        ber_free(bep, 1);
#endif
      ]])
    ],[
      ac_cv_header_winber_h="yes"
    ],[
      ac_cv_header_winber_h="no"
    ])
  ])
  case "$ac_cv_header_winber_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_WINBER_H, 1,
        [Define to 1 if you have the winber.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_LBER
dnl -------------------------------------------------
dnl Check for compilable and valid lber.h header,
dnl and check if it is needed even with ldap.h

AC_DEFUN([CURL_CHECK_HEADER_LBER], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINDOWS])dnl
  AC_CACHE_CHECK([for lber.h], [ac_cv_header_lber_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#endif
#ifndef NULL
#define NULL (void *)0
#endif
#include <lber.h>
      ]],[[
        BerValue *bvp = NULL;
        BerElement *bep = ber_init(bvp);
        ber_free(bep, 1);
      ]])
    ],[
      ac_cv_header_lber_h="yes"
    ],[
      ac_cv_header_lber_h="no"
    ])
  ])
  if test "$ac_cv_header_lber_h" = "yes"; then
    AC_DEFINE_UNQUOTED(HAVE_LBER_H, 1,
      [Define to 1 if you have the lber.h header file.])
    #
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#endif
#ifndef NULL
#define NULL (void *)0
#endif
#ifndef LDAP_DEPRECATED
#define LDAP_DEPRECATED 1
#endif
#include <ldap.h>
      ]],[[
        BerValue *bvp = NULL;
        BerElement *bep = ber_init(bvp);
        ber_free(bep, 1);
      ]])
    ],[
      curl_cv_need_header_lber_h="no"
    ],[
      curl_cv_need_header_lber_h="yes"
    ])
    #
    case "$curl_cv_need_header_lber_h" in
      yes)
        AC_DEFINE_UNQUOTED(NEED_LBER_H, 1,
          [Define to 1 if you need the lber.h header file even with ldap.h])
        ;;
    esac
  fi
])


dnl CURL_CHECK_HEADER_LDAP
dnl -------------------------------------------------
dnl Check for compilable and valid ldap.h header

AC_DEFUN([CURL_CHECK_HEADER_LDAP], [
  AC_REQUIRE([CURL_CHECK_HEADER_LBER])dnl
  AC_CACHE_CHECK([for ldap.h], [ac_cv_header_ldap_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#endif
#ifndef LDAP_DEPRECATED
#define LDAP_DEPRECATED 1
#endif
#ifdef NEED_LBER_H
#include <lber.h>
#endif
#include <ldap.h>
      ]],[[
        LDAP *ldp = ldap_init("dummy", LDAP_PORT);
        int res = ldap_unbind(ldp);
      ]])
    ],[
      ac_cv_header_ldap_h="yes"
    ],[
      ac_cv_header_ldap_h="no"
    ])
  ])
  case "$ac_cv_header_ldap_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_LDAP_H, 1,
        [Define to 1 if you have the ldap.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_LDAP_SSL
dnl -------------------------------------------------
dnl Check for compilable and valid ldap_ssl.h header

AC_DEFUN([CURL_CHECK_HEADER_LDAP_SSL], [
  AC_REQUIRE([CURL_CHECK_HEADER_LDAP])dnl
  AC_CACHE_CHECK([for ldap_ssl.h], [ac_cv_header_ldap_ssl_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#endif
#ifndef LDAP_DEPRECATED
#define LDAP_DEPRECATED 1
#endif
#ifdef NEED_LBER_H
#include <lber.h>
#endif
#ifdef HAVE_LDAP_H
#include <ldap.h>
#endif
#include <ldap_ssl.h>
      ]],[[
        LDAP *ldp = ldapssl_init("dummy", LDAPS_PORT, 1);
      ]])
    ],[
      ac_cv_header_ldap_ssl_h="yes"
    ],[
      ac_cv_header_ldap_ssl_h="no"
    ])
  ])
  case "$ac_cv_header_ldap_ssl_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_LDAP_SSL_H, 1,
        [Define to 1 if you have the ldap_ssl.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_HEADER_LDAPSSL
dnl -------------------------------------------------
dnl Check for compilable and valid ldapssl.h header

AC_DEFUN([CURL_CHECK_HEADER_LDAPSSL], [
  AC_REQUIRE([CURL_CHECK_HEADER_LDAP])dnl
  AC_CACHE_CHECK([for ldapssl.h], [ac_cv_header_ldapssl_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#endif
#ifndef NULL
#define NULL (void *)0
#endif
#ifndef LDAP_DEPRECATED
#define LDAP_DEPRECATED 1
#endif
#ifdef NEED_LBER_H
#include <lber.h>
#endif
#ifdef HAVE_LDAP_H
#include <ldap.h>
#endif
#include <ldapssl.h>
      ]],[[
        char *cert_label = NULL;
        LDAP *ldp = ldap_ssl_init("dummy", LDAPS_PORT, cert_label);
      ]])
    ],[
      ac_cv_header_ldapssl_h="yes"
    ],[
      ac_cv_header_ldapssl_h="no"
    ])
  ])
  case "$ac_cv_header_ldapssl_h" in
    yes)
      AC_DEFINE_UNQUOTED(HAVE_LDAPSSL_H, 1,
        [Define to 1 if you have the ldapssl.h header file.])
      ;;
  esac
])


dnl CURL_CHECK_LIBS_WINLDAP
dnl -------------------------------------------------
dnl Check for libraries needed for WINLDAP support,
dnl and prepended to LIBS any needed libraries.
dnl This macro can take an optional parameter with a
dnl white space separated list of libraries to check
dnl before the WINLDAP default ones.

AC_DEFUN([CURL_CHECK_LIBS_WINLDAP], [
  AC_REQUIRE([CURL_CHECK_HEADER_WINBER])dnl
  #
  AC_MSG_CHECKING([for WINLDAP libraries])
  #
  u_libs=""
  #
  ifelse($1,,,[
    for x_lib in $1; do
      case "$x_lib" in
        -l*)
          l_lib="$x_lib"
          ;;
        *)
          l_lib="-l$x_lib"
          ;;
      esac
      if test -z "$u_libs"; then
        u_libs="$l_lib"
      else
        u_libs="$u_libs $l_lib"
      fi
    done
  ])
  #
  curl_cv_save_LIBS="$LIBS"
  curl_cv_ldap_LIBS="unknown"
  #
  for x_nlibs in '' "$u_libs" \
    '-lwldap32' ; do
    if test -z "$x_nlibs"; then
      LIBS="$curl_cv_save_LIBS"
    else
      LIBS="$x_nlibs $curl_cv_save_LIBS"
    fi
    AC_LINK_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef HAVE_WINLDAP_H
#include <winldap.h>
#endif
#ifdef HAVE_WINBER_H
#include <winber.h>
#endif
#endif
      ]],[[
        BERVAL *bvp = NULL;
        BerElement *bep = ber_init(bvp);
        LDAP *ldp = ldap_init("dummy", LDAP_PORT);
        ULONG res = ldap_unbind(ldp);
        ber_free(bep, 1);
      ]])
    ],[
      curl_cv_ldap_LIBS="$x_nlibs"
      break
    ])
  done
  #
  LIBS="$curl_cv_save_LIBS"
  #
  case X-"$curl_cv_ldap_LIBS" in
    X-unknown)
      AC_MSG_RESULT([cannot find WINLDAP libraries])
      ;;
    X-)
      AC_MSG_RESULT([no additional lib required])
      ;;
    *)
      if test -z "$curl_cv_save_LIBS"; then
        LIBS="$curl_cv_ldap_LIBS"
      else
        LIBS="$curl_cv_ldap_LIBS $curl_cv_save_LIBS"
      fi
      AC_MSG_RESULT([$curl_cv_ldap_LIBS])
      ;;
  esac
  #
])


dnl CURL_CHECK_LIBS_LDAP
dnl -------------------------------------------------
dnl Check for libraries needed for LDAP support,
dnl and prepended to LIBS any needed libraries.
dnl This macro can take an optional parameter with a
dnl white space separated list of libraries to check
dnl before the default ones.

AC_DEFUN([CURL_CHECK_LIBS_LDAP], [
  AC_REQUIRE([CURL_CHECK_HEADER_LDAP])dnl
  #
  AC_MSG_CHECKING([for LDAP libraries])
  #
  u_libs=""
  #
  ifelse($1,,,[
    for x_lib in $1; do
      case "$x_lib" in
        -l*)
          l_lib="$x_lib"
          ;;
        *)
          l_lib="-l$x_lib"
          ;;
      esac
      if test -z "$u_libs"; then
        u_libs="$l_lib"
      else
        u_libs="$u_libs $l_lib"
      fi
    done
  ])
  #
  curl_cv_save_LIBS="$LIBS"
  curl_cv_ldap_LIBS="unknown"
  #
  for x_nlibs in '' "$u_libs" \
    '-lldap' \
    '-llber -lldap' \
    '-lldap -llber' \
    '-lldapssl -lldapx -lldapsdk' \
    '-lldapsdk -lldapx -lldapssl' ; do
    if test -z "$x_nlibs"; then
      LIBS="$curl_cv_save_LIBS"
    else
      LIBS="$x_nlibs $curl_cv_save_LIBS"
    fi
    AC_LINK_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#endif
#ifndef NULL
#define NULL (void *)0
#endif
#ifndef LDAP_DEPRECATED
#define LDAP_DEPRECATED 1
#endif
#ifdef NEED_LBER_H
#include <lber.h>
#endif
#ifdef HAVE_LDAP_H
#include <ldap.h>
#endif
      ]],[[
        BerValue *bvp = NULL;
        BerElement *bep = ber_init(bvp);
        LDAP *ldp = ldap_init("dummy", LDAP_PORT);
        int res = ldap_unbind(ldp);
        ber_free(bep, 1);
      ]])
    ],[
      curl_cv_ldap_LIBS="$x_nlibs"
      break
    ])
  done
  #
  LIBS="$curl_cv_save_LIBS"
  #
  case X-"$curl_cv_ldap_LIBS" in
    X-unknown)
      AC_MSG_RESULT([cannot find LDAP libraries])
      ;;
    X-)
      AC_MSG_RESULT([no additional lib required])
      ;;
    *)
      if test -z "$curl_cv_save_LIBS"; then
        LIBS="$curl_cv_ldap_LIBS"
      else
        LIBS="$curl_cv_ldap_LIBS $curl_cv_save_LIBS"
      fi
      AC_MSG_RESULT([$curl_cv_ldap_LIBS])
      ;;
  esac
  #
])


dnl CURL_CHECK_HEADER_MALLOC
dnl -------------------------------------------------
dnl Check for compilable and valid malloc.h header,
dnl and check if it is needed even with stdlib.h

AC_DEFUN([CURL_CHECK_HEADER_MALLOC], [
  AC_CACHE_CHECK([for malloc.h], [ac_cv_header_malloc_h], [
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#include <malloc.h>
      ]],[[
        void *p = malloc(10);
        void *q = calloc(10,10);
        free(p);
        free(q);
      ]])
    ],[
      ac_cv_header_malloc_h="yes"
    ],[
      ac_cv_header_malloc_h="no"
    ])
  ])
  if test "$ac_cv_header_malloc_h" = "yes"; then
    AC_DEFINE_UNQUOTED(HAVE_MALLOC_H, 1,
      [Define to 1 if you have the malloc.h header file.])
    #
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
#include <stdlib.h>
      ]],[[
        void *p = malloc(10);
        void *q = calloc(10,10);
        free(p);
        free(q);
      ]])
    ],[
      curl_cv_need_header_malloc_h="no"
    ],[
      curl_cv_need_header_malloc_h="yes"
    ])
    #
    case "$curl_cv_need_header_malloc_h" in
      yes)
        AC_DEFINE_UNQUOTED(NEED_MALLOC_H, 1,
          [Define to 1 if you need the malloc.h header file even with stdlib.h])
        ;;
    esac
  fi
])


dnl CURL_CHECK_TYPE_SOCKLEN_T
dnl -------------------------------------------------
dnl Check for existing socklen_t type, and provide
dnl an equivalent type if socklen_t not available

AC_DEFUN([CURL_CHECK_TYPE_SOCKLEN_T], [
  AC_REQUIRE([CURL_CHECK_HEADER_WS2TCPIP])dnl
  AC_CHECK_TYPE([socklen_t], ,[
    dnl socklen_t not available
    AC_CACHE_CHECK([for socklen_t equivalent],
      [curl_cv_socklen_t_equiv], [
      curl_cv_socklen_t_equiv="unknown"
      for arg1 in 'int' 'SOCKET'; do
        for arg2 in "struct sockaddr" void; do
          for t in int size_t unsigned long "unsigned long"; do
            AC_COMPILE_IFELSE([
              AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#else
#ifdef HAVE_WINSOCK_H
#include <winsock.h>
#endif
#endif
#define GETPEERNCALLCONV PASCAL
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#define GETPEERNCALLCONV
#endif
                extern int GETPEERNCALLCONV getpeername ($arg1, $arg2 *, $t *);
              ]],[[
                $t len=0;
                getpeername(0,0,&len);
              ]])
            ],[
               curl_cv_socklen_t_equiv="$t"
               break 3
            ])
          done
        done
      done
    ])
    case "$curl_cv_socklen_t_equiv" in
      unknown)
        AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
        ;;
      *)
        AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
          [Type to use in place of socklen_t when system does not provide it.])
        ;;
    esac
  ],[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#endif
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#endif
  ])
])


dnl CURL_CHECK_FUNC_GETNAMEINFO
dnl -------------------------------------------------
dnl Test if the getnameinfo function is available, 
dnl and check the types of five of its arguments.
dnl If the function succeeds HAVE_GETNAMEINFO will be
dnl defined, defining the types of the arguments in
dnl GETNAMEINFO_TYPE_ARG1, GETNAMEINFO_TYPE_ARG2,
dnl GETNAMEINFO_TYPE_ARG46 and GETNAMEINFO_TYPE_ARG7,
dnl and also defining the type qualifier of first 
dnl argument in GETNAMEINFO_QUAL_ARG1.

AC_DEFUN([CURL_CHECK_FUNC_GETNAMEINFO], [
  AC_REQUIRE([CURL_CHECK_HEADER_WS2TCPIP])dnl
  AC_REQUIRE([CURL_CHECK_TYPE_SOCKLEN_T])dnl
  AC_CHECK_HEADERS(sys/types.h sys/socket.h netdb.h)
  #
  AC_MSG_CHECKING([for getnameinfo])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([getnameinfo])
  ],[
    AC_MSG_RESULT([yes])
    curl_cv_getnameinfo="yes"
  ],[
    AC_MSG_RESULT([no])
    curl_cv_getnameinfo="no"
  ])
  #
  if test "$curl_cv_getnameinfo" != "yes"; then
    AC_MSG_CHECKING([deeper for getnameinfo])
    AC_LINK_IFELSE([
      AC_LANG_PROGRAM([[
      ]],[[
        getnameinfo();
      ]])
    ],[
      AC_MSG_RESULT([yes])
      curl_cv_getnameinfo="yes"
    ],[
      AC_MSG_RESULT([but still no])
      curl_cv_getnameinfo="no"
    ])
  fi
  #
  if test "$curl_cv_getnameinfo" != "yes"; then
    AC_MSG_CHECKING([deeper and deeper for getnameinfo])
    AC_LINK_IFELSE([
      AC_LANG_PROGRAM([[
#undef inline
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#endif
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#endif
      ]],[[
        getnameinfo(0, 0, 0, 0, 0, 0, 0);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      curl_cv_getnameinfo="yes"
    ],[
      AC_MSG_RESULT([but still no])
      curl_cv_getnameinfo="no"
    ])
  fi
  #
  if test "$curl_cv_getnameinfo" = "yes"; then
    AC_CACHE_CHECK([types of arguments for getnameinfo],
      [curl_cv_func_getnameinfo_args], [
      curl_cv_func_getnameinfo_args="unknown"
      for gni_arg1 in 'struct sockaddr *' 'const struct sockaddr *' 'void *'; do
        for gni_arg2 in 'socklen_t' 'size_t' 'int'; do
          for gni_arg46 in 'size_t' 'int' 'socklen_t' 'unsigned int' 'DWORD'; do
            for gni_arg7 in 'int' 'unsigned int'; do
              AC_COMPILE_IFELSE([
                AC_LANG_PROGRAM([[
#undef inline 
#ifdef HAVE_WINDOWS_H
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#if (!defined(_WIN32_WINNT)) || (_WIN32_WINNT < 0x0501)
#undef _WIN32_WINNT
#define _WIN32_WINNT 0x0501
#endif
#include <windows.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h> 
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#endif
#define GNICALLCONV WSAAPI
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#define GNICALLCONV
#endif
                  extern int GNICALLCONV getnameinfo($gni_arg1, $gni_arg2,
                                         char *, $gni_arg46,
                                         char *, $gni_arg46,
                                         $gni_arg7);
                ]],[[
                  $gni_arg2 salen=0;
                  $gni_arg46 hostlen=0;
                  $gni_arg46 servlen=0;
                  $gni_arg7 flags=0;
                  int res = getnameinfo(0, salen, 0, hostlen, 0, servlen, flags);
                ]])
              ],[
                 curl_cv_func_getnameinfo_args="$gni_arg1,$gni_arg2,$gni_arg46,$gni_arg7"
                 break 4
              ])
            done
          done
        done
      done
    ]) # AC_CACHE_CHECK
    if test "$curl_cv_func_getnameinfo_args" = "unknown"; then
      AC_MSG_WARN([Cannot find proper types to use for getnameinfo args])
      AC_MSG_WARN([HAVE_GETNAMEINFO will not be defined])