# Copyright (C) 1998-2009 Joe Orton <joe@manyfish.co.uk>    -*- autoconf -*-
# Copyright (C) 2004 Aleix Conchillo Flaque <aleix@member.fsf.org>
#
# This file is free software; you may copy and/or distribute it with
# or without modifications, as long as this notice is preserved.
# This software is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even
# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.

# The above license applies to THIS FILE ONLY, the neon library code
# itself may be copied and distributed under the terms of the GNU
# LGPL, see COPYING.LIB for more details

# This file is part of the neon HTTP/WebDAV client library.
# See http://www.webdav.org/neon/ for the latest version. 
# Please send any feedback to <neon@lists.manyfish.co.uk>

#
# Usage:
#
#      NEON_LIBRARY
# or   NEON_BUNDLED(srcdir, [ACTIONS-IF-BUNDLED], [ACTIONS-IF-NOT_BUNDLED]) 
# or   NEON_VPATH_BUNDLED(srcdir, builddir, 
#			  [ACTIONS-IF-BUNDLED], [ACTIONS-IF-NOT-BUNDLED])
#
#   where srcdir is the location of bundled neon 'src' directory.
#   If using a VPATH-enabled build, builddir is the location of the
#   build directory corresponding to srcdir.
#
#   If a bundled build *is* being used, ACTIONS-IF-BUNDLED will be
#   evaluated. These actions should ensure that 'make' is run
#   in srcdir, and that one of NEON_NORMAL_BUILD or NEON_LIBTOOL_BUILD 
#   is called.
#
# After calling one of the above macros, if the NEON_NEED_XML_PARSER
# variable is set to "yes", then you must configure an XML parser
# too. You can do this your own way, or do it easily using the
# NEON_XML_PARSER() macro. Example usage for where we have bundled the
# neon sources in a directory called libneon, and bundled expat
# sources in a directory called 'expat'.
#
#   NEON_BUNDLED(libneon, [
#	NEON_XML_PARSER(expat)
#	NEON_NORMAL_BUILD
#   ])
#
# Alternatively, for a simple standalone app with neon as a
# dependancy, use just:
#
#   NEON_LIBRARY
# 
# and rely on the user installing neon correctly.
#
# You are free to configure an XML parser any other way you like,
# but the end result must be, either expat or libxml will get linked
# in, and HAVE_EXPAT or HAVE_LIBXML is defined appropriately.
#
# To set up the bundled build environment, call 
#
#    NEON_NORMAL_BUILD
# or
#    NEON_LIBTOOL_BUILD
# 
# depending on whether you are using libtool to build, or not.
# Both these macros take an optional argument specifying the set
# of object files you wish to build: if the argument is not given,
# all of neon will be built.

AC_DEFUN([NEON_BUNDLED],[

neon_bundled_srcdir=$1
neon_bundled_builddir=$1

NEON_COMMON_BUNDLED([$2], [$3])

])

AC_DEFUN([NEON_VPATH_BUNDLED],[

neon_bundled_srcdir=$1
neon_bundled_builddir=$2
NEON_COMMON_BUNDLED([$3], [$4])

])

AC_DEFUN([NEON_COMMON_BUNDLED],[

AC_PREREQ(2.50)

AC_ARG_WITH(included-neon,
AS_HELP_STRING([--with-included-neon], [force use of included neon library]),
[neon_force_included="$withval"], [neon_force_included="no"])

NEON_COMMON

# The colons are here so there is something to evaluate
# in case the argument was not passed.
if test "$neon_force_included" = "yes"; then
	:
	$1
else
	:
	$2
fi

])

dnl Not got any bundled sources:
AC_DEFUN([NEON_LIBRARY],[

AC_PREREQ(2.50)
neon_force_included=no
neon_bundled_srcdir=
neon_bundled_builddir=

NEON_COMMON

])

AC_DEFUN([NE_DEFINE_VERSIONS], [

NEON_VERSION="${NE_VERSION_MAJOR}.${NE_VERSION_MINOR}.${NE_VERSION_PATCH}${NE_VERSION_TAG}"

AC_DEFINE_UNQUOTED([NEON_VERSION], ["${NEON_VERSION}"],
                   [Define to be the neon version string])
AC_DEFINE_UNQUOTED([NE_VERSION_MAJOR], [(${NE_VERSION_MAJOR})],
                   [Define to be neon library major version])
AC_DEFINE_UNQUOTED([NE_VERSION_MINOR], [(${NE_VERSION_MINOR})],
                   [Define to be neon library minor version])
AC_DEFINE_UNQUOTED([NE_VERSION_PATCH], [(${NE_VERSION_PATCH})],
                   [Define to be neon library patch version])
])

AC_DEFUN([NE_VERSIONS_BUNDLED], [

# Define the current versions.
NE_VERSION_MAJOR=0
NE_VERSION_MINOR=30
NE_VERSION_PATCH=1
NE_VERSION_TAG=

# 0.30.x is backwards-compatible to 0.27.x, so AGE=3
NE_LIBTOOL_VERSINFO="30:${NE_VERSION_PATCH}:3"

NE_DEFINE_VERSIONS

])

dnl Adds an ABI variation tag which will be added to the SONAME of
dnl a shared library.  e.g. NE_ADD_ABITAG(FOO)
AC_DEFUN([NE_ADD_ABITAG], [
if test "x${NE_LIBTOOL_RELEASE}y" = "xy"; then
   NE_LIBTOOL_RELEASE="$1"
else
   NE_LIBTOOL_RELEASE="${NE_LIBTOOL_RELEASE}-$1"
fi
])

dnl Define the minimum required versions, usage:
dnl   NE_REQUIRE_VERSIONS([major-version], [minor-versions])
dnl e.g.
dnl   NE_REQUIRE_VERSIONS([0], [24 25])
dnl to require neon 0.24.x or neon 0.25.x.
AC_DEFUN([NE_REQUIRE_VERSIONS], [
m4_define([ne_require_major], [$1])
m4_define([ne_require_minor], [$2])
])

dnl Check that the external library found in a given location
dnl matches the min. required version (if any).  Requires that
dnl NEON_CONFIG be set the the full path of a valid neon-config
dnl script
dnl
dnl Usage:
dnl    NEON_CHECK_VERSION(ACTIONS-IF-OKAY, ACTIONS-IF-FAILURE)
dnl
AC_DEFUN([NEON_CHECK_VERSION], [
m4_ifdef([ne_require_major], [
    # Check whether the library is of required version
    ne_save_LIBS="$LIBS"
    ne_save_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS `$NEON_CONFIG --cflags`"
    LIBS="$LIBS `$NEON_CONFIG --libs`"
    ne_libver=`$NEON_CONFIG --version | sed -e "s/neon //g"`
    # Check whether it's possible to link against neon
    AC_CACHE_CHECK([linking against neon], [ne_cv_lib_neon],
    [AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([[#include <ne_utils.h>]], [[ne_version_match(0, 0);]])],
	[ne_cv_lib_neon=yes], [ne_cv_lib_neon=no])])
    if test "$ne_cv_lib_neon" = "yes"; then
       ne_cv_lib_neonver=no
       for v in ne_require_minor; do
          case $ne_libver in
          ne_require_major.$v.*) ne_cv_lib_neonver=yes ;;
          esac
       done
    fi
    ne_goodver=$ne_cv_lib_neonver
    LIBS=$ne_save_LIBS
    CFLAGS=$ne_save_CFLAGS
], [
   # NE_REQUIRE_VERSIONS not used; presume all versions OK!
    ne_goodver=yes
    ne_libver="(version unknown)"
])

if test "$ne_goodver" = "yes"; then
    AC_MSG_NOTICE([using neon library $ne_libver])
    $1
else
    AC_MSG_NOTICE([incompatible neon library version $ne_libver: wanted ne_require_major.ne_require_minor])
    $2
fi])

dnl NEON_CHECK_SUPPORT(feature, var, name)
AC_DEFUN([NEON_CHECK_SUPPORT], [
if $NEON_CONFIG --support $1 >/dev/null; then
   NE_ENABLE_SUPPORT($2, [$3 is supported by neon])
else
   NE_DISABLE_SUPPORT($2, [$3 is not supported by neon])
fi
])

dnl enable support for feature $1 with define NE_HAVE_$1, message $2
AC_DEFUN([NE_ENABLE_SUPPORT], [
NE_FLAG_$1=yes
AC_SUBST(NE_FLAG_$1)
AC_DEFINE([NE_HAVE_]$1, 1, [Defined if $1 is supported])
m4_if([$2], [], 
 [ne_$1_message="support enabled"
  AC_MSG_NOTICE([$1 support is enabled])],
 [ne_$1_message="$2"
  AC_MSG_NOTICE([$2])])
])

dnl Disable support for feature $1, giving message $2
AC_DEFUN([NE_DISABLE_SUPPORT], [
NE_FLAG_$1=no
AC_SUBST(NE_FLAG_$1)
m4_if([$2], [],
 [ne_$1_message="not supported"
  AC_MSG_NOTICE([$1 support is not enabled])],
 [ne_$1_message="$2"
  AC_MSG_NOTICE([$2])])
])

AC_DEFUN([NEON_USE_EXTERNAL], [
# Configure to use an external neon, given a neon-config script
# found at $NEON_CONFIG.
neon_prefix=`$NEON_CONFIG --prefix`
NEON_CHECK_VERSION([
    # Pick up CFLAGS and LIBS needed
    CFLAGS="$CFLAGS `$NEON_CONFIG --cflags`"
    NEON_LIBS="$NEON_LIBS `$NEON_CONFIG --libs`"
    # Pick up library version
    set dummy `$NEON_CONFIG --version | sed 's/\./ /g'`
    NE_VERSION_MAJOR=[$]3; NE_VERSION_MINOR=[$]4; NE_VERSION_PATCH=[$]5
    NE_DEFINE_VERSIONS
    neon_library_message="library in ${neon_prefix} (${NEON_VERSION})"
    neon_xml_parser_message="using whatever neon uses"
    NEON_CHECK_SUPPORT([ssl], [SSL], [SSL])
    NEON_CHECK_SUPPORT([zlib], [ZLIB], [zlib])
    NEON_CHECK_SUPPORT([ipv6], [IPV6], [IPv6])
    NEON_CHECK_SUPPORT([lfs], [LFS], [LFS])
    NEON_CHECK_SUPPORT([ts_ssl], [TS_SSL], [thread-safe SSL])
    neon_got_library=yes
    if test $NE_FLAG_LFS = yes; then
       NEON_FORMAT(off64_t)
       AC_DEFINE_UNQUOTED([NE_FMT_NE_OFF_T], [NE_FMT_OFF64_T], 
            [Define to be printf format string for ne_off_t])
    else
       AC_DEFINE_UNQUOTED([NE_FMT_NE_OFF_T], [NE_FMT_OFF_T])
    fi
], [neon_got_library=no])
])

AC_DEFUN([NEON_COMMON],[

AC_REQUIRE([NEON_COMMON_CHECKS])

AC_ARG_WITH(neon,
[  --with-neon[[=DIR]]       specify location of neon library],
[case $withval in
yes|no) neon_force_external=$withval; neon_ext_path= ;;
*) neon_force_external=yes; neon_ext_path=$withval ;;
esac;], [
neon_force_external=no
neon_ext_path=
])

if test "$neon_force_included" = "no"; then
    # There is no included neon source directory, or --with-included-neon
    # wasn't given (so we're not forced to use it).

    # Default to no external neon.
    neon_got_library=no
    if test "x$neon_ext_path" = "x"; then
	AC_PATH_PROG([NEON_CONFIG], neon-config, none)
	if test "x${NEON_CONFIG}" = "xnone"; then
	    AC_MSG_NOTICE([no external neon library found])
	elif test -x "${NEON_CONFIG}"; then
	    NEON_USE_EXTERNAL
	else
	    AC_MSG_NOTICE([ignoring non-executable ${NEON_CONFIG}])
	fi
    else
	AC_MSG_CHECKING([for neon library in $neon_ext_path])
	NEON_CONFIG="$neon_ext_path/bin/neon-config"
	if test -x ${NEON_CONFIG}; then
	    AC_MSG_RESULT([found])
	    NEON_USE_EXTERNAL
	else
	    AC_MSG_RESULT([not found])
	    # ...will fail since force_external=yes
	fi
    fi

    if test "$neon_got_library" = "no"; then 
	if test $neon_force_external = yes; then
	    AC_MSG_ERROR([could not use external neon library])
	elif test -n "$neon_bundled_srcdir"; then
	    # Couldn't find external neon, forced to use bundled sources
	    neon_force_included="yes"
	else
	    # Couldn't find neon, and don't have bundled sources
	    AC_MSG_ERROR(could not find neon)
	fi
    fi
fi

if test "$neon_force_included" = "yes"; then
    NE_VERSIONS_BUNDLED
    AC_MSG_NOTICE([using bundled neon ($NEON_VERSION)])
    NEON_BUILD_BUNDLED="yes"
    LIBNEON_SOURCE_CHECKS
    CFLAGS="$CFLAGS -I$neon_bundled_srcdir"
    NEON_LIBS="-L$neon_bundled_builddir -lneon $NEON_LIBS"
    NEON_NEED_XML_PARSER=yes
    neon_library_message="included libneon (${NEON_VERSION})"
else
    # Don't need to configure an XML parser
    NEON_NEED_XML_PARSER=no
    NEON_BUILD_BUNDLED=no
fi

AC_SUBST(NEON_BUILD_BUNDLED)

])

dnl AC_SEARCH_LIBS done differently. Usage:
dnl   NE_SEARCH_LIBS(function, libnames, [extralibs], [actions-if-not-found],
dnl                            [actions-if-found])
dnl Tries to find 'function' by linking againt `-lLIB $NEON_LIBS' for each
dnl LIB in libnames.  If link fails and 'extralibs' is given, will also
dnl try linking against `-lLIB extralibs $NEON_LIBS`.
dnl Once link succeeds, `-lLIB [extralibs]` is prepended to $NEON_LIBS, and
dnl `actions-if-found' are executed, if given.
dnl If link never succeeds, run `actions-if-not-found', if given, else
dnl give an error and fail configure.
AC_DEFUN([NE_SEARCH_LIBS], [

AC_REQUIRE([NE_CHECK_OS])

AC_CACHE_CHECK([for library containing $1], [ne_cv_libsfor_$1], [
AC_LINK_IFELSE(
  [AC_LANG_PROGRAM([], [[$1();]])], 
  [ne_cv_libsfor_$1="none needed"], [
ne_sl_save_LIBS=$LIBS
ne_cv_libsfor_$1="not found"
for lib in $2; do
    # The w32api libraries link using the stdcall calling convention.
    case ${lib}-${ne_cv_os_uname} in
    ws2_32-MINGW*) ne__code="__stdcall $1();" ;;
    *) ne__code="$1();" ;;
    esac

    LIBS="$ne_sl_save_LIBS -l$lib $NEON_LIBS"
    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [$ne__code])],
                   [ne_cv_libsfor_$1="-l$lib"; break])
    m4_if($3, [], [], dnl If $3 is specified, then...
              [LIBS="$ne_sl_save_LIBS -l$lib $3 $NEON_LIBS"
               AC_LINK_IFELSE([AC_LANG_PROGRAM([], [$ne__code])], 
                              [ne_cv_libsfor_$1="-l$lib $3"; break])])
done
LIBS=$ne_sl_save_LIBS])])

if test "$ne_cv_libsfor_$1" = "not found"; then
   m4_if([$4], [], [AC_MSG_ERROR([could not find library containing $1])], [$4])
elif test "$ne_cv_libsfor_$1" = "none needed"; then
   m4_if([$5], [], [:], [$5])
else
   NEON_LIBS="$ne_cv_libsfor_$1 $NEON_LIBS"
   $5
fi])

dnl Check for presence and suitability of zlib library
AC_DEFUN([NEON_ZLIB], [

AC_ARG_WITH(zlib, AS_HELP_STRING([--without-zlib], [disable zlib support]),
ne_use_zlib=$withval, ne_use_zlib=yes)

if test "$ne_use_zlib" = "yes"; then
    AC_CHECK_HEADER(zlib.h, [
  	AC_CHECK_LIB(z, inflate, [ 
	    NEON_LIBS="$NEON_LIBS -lz"
            NE_ENABLE_SUPPORT(ZLIB, [zlib support enabled, using -lz])
	], [NE_DISABLE_SUPPORT(ZLIB, [zlib library not found])])
    ], [NE_DISABLE_SUPPORT(ZLIB, [zlib header not found])])
else
    NE_DISABLE_SUPPORT(ZLIB, [zlib not enabled])
fi
])

AC_DEFUN([NE_CHECK_OS], [
# Check for Darwin, which needs extra cpp and linker flags.
AC_CACHE_CHECK([for uname], ne_cv_os_uname, [
 ne_cv_os_uname=`uname -s 2>/dev/null`
])

if test "$ne_cv_os_uname" = "Darwin"; then
  CPPFLAGS="$CPPFLAGS -no-cpp-precomp"
  LDFLAGS="$LDFLAGS -flat_namespace" 
  # poll has various issues in various Darwin releases
  if test x${ac_cv_func_poll+set} != xset; then
    ac_cv_func_poll=no
  fi
fi
])

AC_DEFUN([NEON_COMMON_CHECKS], [

# These checks are done whether or not the bundled neon build
# is used.

ifdef([AC_USE_SYSTEM_EXTENSIONS], 
[AC_USE_SYSTEM_EXTENSIONS],
[AC_ISC_POSIX])
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_C_INLINE])
AC_REQUIRE([AC_C_CONST])
AC_REQUIRE([AC_TYPE_SIZE_T])
AC_REQUIRE([AC_TYPE_OFF_T])

AC_REQUIRE([NE_CHECK_OS])

AC_REQUIRE([AC_PROG_MAKE_SET])

AC_REQUIRE([AC_HEADER_STDC])

AC_CHECK_HEADERS([errno.h stdarg.h string.h stdlib.h sys/uio.h])

NEON_FORMAT(size_t,,u) dnl size_t is unsigned; use %u formats
NEON_FORMAT(off_t)
NEON_FORMAT(ssize_t)

])

AC_DEFUN([NEON_FORMAT_PREP], [
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
if test "$GCC" = "yes"; then
  AC_CACHE_CHECK([for gcc -Wformat -Werror sanity], ne_cv_cc_werror, [
  # See whether a simple test program will compile without errors.
  ne_save_CPPFLAGS=$CPPFLAGS
  CPPFLAGS="$CPPFLAGS -Wformat -Werror"
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#include <stdio.h>]], [[int i = 42; printf("%d", i);]])],
  [ne_cv_cc_werror=yes], [ne_cv_cc_werror=no])
  CPPFLAGS=$ne_save_CPPFLAGS])
  ne_fmt_trycompile=$ne_cv_cc_werror
else
  ne_fmt_trycompile=no
fi
])

dnl Check for LFS support
AC_DEFUN([NE_LARGEFILE], [
dnl Need the size of off_t
AC_REQUIRE([NEON_COMMON_CHECKS])

if test -z "$ac_cv_sizeof_off_t"; then
   NE_DISABLE_SUPPORT(LFS, [LFS support omitted: off_t size unknown!])
elif test $ac_cv_sizeof_off_t != 4; then
   NE_DISABLE_SUPPORT(LFS, [LFS support unnecessary, off_t is not 32-bit])
   AC_CHECK_FUNCS([strtoll strtoq], [break])
elif test -z "$ac_cv_sizeof_long_long"; then
   NE_DISABLE_SUPPORT(LFS, [LFS support omitted: long long size unknown])
elif test $ac_cv_sizeof_long_long != 8; then
   NE_DISABLE_SUPPORT(LFS, [LFS support omitted: long long not 64-bit])
else
   ne_save_CPPFLAGS=$CPPFLAGS
   CPPFLAGS="$CPPFLAGS -D_LARGEFILE64_SOURCE"
   AC_CHECK_TYPE(off64_t, [
     NEON_FORMAT(off64_t)
     ne_lfsok=no
     AC_CHECK_FUNCS([strtoll strtoq], [ne_lfsok=yes; break])
     AC_CHECK_FUNCS([lseek64 fstat64], [], [ne_lfsok=no; break])
     if test x$ne_lfsok = xyes; then
       NE_ENABLE_SUPPORT(LFS, [LFS (large file) support enabled])
       NEON_CFLAGS="$NEON_CFLAGS -D_LARGEFILE64_SOURCE -DNE_LFS"
       ne_save_CPPFLAGS="$CPPFLAGS -DNE_LFS"
     else
       NE_DISABLE_SUPPORT(LFS, 
         [LFS support omitted: 64-bit support functions not found])
     fi], [NE_DISABLE_SUPPORT(LFS, [LFS support omitted: off64_t type not found])])
   CPPFLAGS=$ne_save_CPPFLAGS
fi
if test "$NE_FLAG_LFS" = "yes"; then
   AC_DEFINE_UNQUOTED([NE_FMT_NE_OFF_T], [NE_FMT_OFF64_T], 
                      [Define to be printf format string for ne_off_t])
   NE_ADD_ABITAG(LFS)
else
   AC_DEFINE_UNQUOTED([NE_FMT_NE_OFF_T], [NE_FMT_OFF_T])
fi
])

dnl NEON_FORMAT(TYPE[, HEADERS[, [SPECIFIER]])
dnl
dnl This macro finds out which modifier is needed to create a
dnl printf format string suitable for printing integer type TYPE (which
dnl may be an int, long, or long long).
dnl The default specifier is 'd', if SPECIFIER is not given.  
dnl TYPE may be defined in HEADERS; sys/types.h is always used first.
AC_DEFUN([NEON_FORMAT], [

AC_REQUIRE([NEON_FORMAT_PREP])

AC_CHECK_SIZEOF($1,, [AC_INCLUDES_DEFAULT
$2])

dnl Work out which specifier character to use
m4_ifdef([ne_spec], [m4_undefine([ne_spec])])
m4_if($#, 3, [m4_define(ne_spec,$3)], [m4_define(ne_spec,d)])

m4_ifdef([ne_cvar], [m4_undefine([ne_cvar])])dnl
m4_define([ne_cvar], m4_translit(ne_cv_fmt_[$1], [ ], [_]))dnl

AC_CACHE_CHECK([how to print $1], [ne_cvar], [
ne_cvar=none
if test $ne_fmt_trycompile = yes; then
  oflags="$CPPFLAGS"
  # Consider format string mismatches as errors
  CPPFLAGS="$CPPFLAGS -Wformat -Werror"
  dnl obscured for m4 quoting: "for str in d ld lld; do"
  for str in ne_spec l]ne_spec[ ll]ne_spec[; do
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
$2
#include <stdio.h>]], [[$1 i = 1; printf("%$str", i);]])],
	[ne_cvar=$str; break])
  done
  CPPFLAGS=$oflags
else
  # Best guess. Don't have to be too precise since we probably won't
  # get a warning message anyway.
  case $ac_cv_sizeof_]m4_translit($1, [ ], [_])[ in
  $ac_cv_sizeof_int) ne_cvar="ne_spec" ;;
  $ac_cv_sizeof_long) ne_cvar="l]ne_spec[" ;;
  $ac_cv_sizeof_long_long) ne_cvar="ll]ne_spec[" ;;
  esac
fi
])

if test "x$ne_cvar" = "xnone"; then
  AC_MSG_ERROR([format string for $1 not found])
fi

AC_DEFINE_UNQUOTED([NE_FMT_]m4_translit($1, [a-z ], [A-Z_]), "$ne_cvar", 
	[Define to be printf format string for $1])
])

dnl Wrapper for AC_CHECK_FUNCS; uses libraries from $NEON_LIBS.
AC_DEFUN([NE_CHECK_FUNCS], [
ne_cf_save_LIBS=$LIBS
LIBS="$LIBS $NEON_LIBS"
AC_CHECK_FUNCS($@)
LIBS=$ne_cf_save_LIBS])

dnl Checks needed when compiling the neon source.
AC_DEFUN([LIBNEON_SOURCE_CHECKS], [

dnl Run all the normal C language/compiler tests
AC_REQUIRE([NEON_COMMON_CHECKS])

dnl Needed for building the MD5 code.
AC_REQUIRE([AC_C_BIGENDIAN])
dnl Is strerror_r present; if so, which variant
AC_REQUIRE([AC_FUNC_STRERROR_R])

AC_CHECK_HEADERS([sys/time.h limits.h sys/select.h arpa/inet.h libintl.h \
	signal.h sys/socket.h netinet/in.h netinet/tcp.h netdb.h sys/poll.h \
	sys/limits.h fcntl.h iconv.h],,,
[AC_INCLUDES_DEFAULT
/* netinet/tcp.h requires netinet/in.h on some platforms. */
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif])

AC_REQUIRE([NE_SNPRINTF])

AC_CACHE_CHECK([for timezone global], ne_cv_cc_timezone, [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#include <time.h>]],
[[time_t t = 0 - timezone; timezone = 1;]])],
ne_cv_cc_timezone=yes, ne_cv_cc_timezone=no)])

if test "$ne_cv_cc_timezone" = "yes"; then
   AC_DEFINE([HAVE_TIMEZONE], 1, [Define if the timezone global is available])
fi

dnl Check for large file support
NE_LARGEFILE

AC_REPLACE_FUNCS(strcasecmp)

AC_CHECK_FUNCS(signal setvbuf setsockopt stpcpy poll fcntl getsockopt)

if test "x${ac_cv_func_poll}${ac_cv_header_sys_poll_h}y" = "xyesyesy"; then
  AC_DEFINE([NE_USE_POLL], 1, [Define if poll() should be used])
fi

if test "$ac_cv_func_stpcpy" = "yes"; then
  AC_CHECK_DECLS(stpcpy)
fi

# Modern AIXes with the "Linux-like" libc have an undeclared stpcpy
AH_BOTTOM([#if defined(HAVE_STPCPY) && defined(HAVE_DECL_STPCPY) && !HAVE_DECL_STPCPY && !defined(stpcpy)
char *stpcpy(char *, const char *);
#endif])

# Unixware 7 can only link gethostbyname with -lnsl -lsocket
# Pick up -lsocket first, then the gethostbyname check will work.
# Haiku requires -lnetwork for socket functions.
NE_SEARCH_LIBS(socket, socket inet ws2_32 network)

# Enable getaddrinfo support if it, gai_strerror and inet_ntop are
# all available.
NE_SEARCH_LIBS(getaddrinfo, nsl,,
  [ne_enable_gai=no],
  [# HP-UX boxes commonly get into a state where getaddrinfo is present
   # but borked: http://marc.theaimsgroup.com/?l=apr-dev&m=107730955207120&w=2
   case x`uname -sr 2>/dev/null`y in
   xHP-UX*11.[[01]]*y)
      AC_MSG_NOTICE([getaddrinfo support disabled on HP-UX 11.0x/11.1x]) ;;
   *)
     ne_enable_gai=yes
     NE_CHECK_FUNCS(gai_strerror getnameinfo inet_ntop inet_pton,,
                    [ne_enable_gai=no; break]) ;;
   esac
])

if test $ne_enable_gai = yes; then
   NE_ENABLE_SUPPORT(IPV6, [IPv6 support is enabled])
   AC_DEFINE(USE_GETADDRINFO, 1, [Define if getaddrinfo() should be used])
   AC_CACHE_CHECK([for working AI_ADDRCONFIG], [ne_cv_gai_addrconfig], [
   AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <netdb.h>
#include <stdlib.h>],
[struct addrinfo hints = {0}, *result;
hints.ai_flags = AI_ADDRCONFIG;
if (getaddrinfo("localhost", NULL, &hints, &result) != 0) return 1;])],
   ne_cv_gai_addrconfig=yes, ne_cv_gai_addrconfig=no, ne_cv_gai_addrconfig=no)])
   if test $ne_cv_gai_addrconfig = yes; then
      AC_DEFINE(USE_GAI_ADDRCONFIG, 1, [Define if getaddrinfo supports AI_ADDRCONFIG])
   fi
else
   # Checks for non-getaddrinfo() based resolver interfaces.
   # QNX has gethostbyname in -lsocket. BeOS only has it in -lbind.
   # CygWin/Winsock2 has it in -lws2_32, allegedly.
   # Haiku requires -lnetwork for socket functions.
   NE_SEARCH_LIBS(gethostbyname, socket nsl bind ws2_32 network)
   NE_SEARCH_LIBS(hstrerror, resolv,,[:])
   NE_CHECK_FUNCS(hstrerror)
   # Older Unixes don't declare h_errno.
   AC_CHECK_DECLS(h_errno,,,[#include <netdb.h>])
   AC_CHECK_TYPE(in_addr_t,,[
     AC_DEFINE([in_addr_t], [unsigned int], 
                            [Define if in_addr_t is not available])], [
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
])
fi

AC_CHECK_TYPES(socklen_t,,
# Linux accept(2) says this should be size_t for SunOS 5... gah.
[AC_DEFINE([socklen_t], [int], 
                        [Define if socklen_t is not available])],[
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
])

AC_CHECK_MEMBERS([struct tm.tm_gmtoff, struct tm.__tm_gmtoff],,,
  [#include <time.h>])

if test ${ac_cv_member_struct_tm_tm_gmtoff}${ac_cv_member_struct_tm___tm_gmtoff}${ne_cv_cc_timezone} = nonono; then
  AC_MSG_WARN([no timezone handling in date parsing on this platform])
fi

ifdef([neon_no_zlib], 
  [NE_DISABLE_SUPPORT(ZLIB, [zlib not supported])],
  [NEON_ZLIB()])

# Conditionally enable ACL support
AC_MSG_CHECKING([whether to enable ACL support in neon])
if test "x$neon_no_acl" = "xyes"; then
    AC_MSG_RESULT(no)
else
    AC_MSG_RESULT(yes)
    NEON_EXTRAOBJS="$NEON_EXTRAOBJS ne_oldacl ne_acl3744"
fi

NEON_SSL()
NEON_GSSAPI()
NEON_LIBPROXY()

AC_SUBST(NEON_CFLAGS)
AC_SUBST(NEON_LIBS)
AC_SUBST(NEON_LTLIBS)

])

dnl Call to put lib/snprintf.o in LIBOBJS and define HAVE_SNPRINTF_H
dnl if snprintf isn't in libc.

AC_DEFUN([NEON_REPLACE_SNPRINTF], [
# Check for snprintf
AC_CHECK_FUNC(snprintf,,[
	AC_DEFINE(HAVE_SNPRINTF_H, 1, [Define if need to include snprintf.h])
	AC_LIBOBJ(lib/snprintf)])
])

dnl turn off webdav, boo hoo.
AC_DEFUN([NEON_WITHOUT_WEBDAV], [
neon_no_webdav=yes
neon_no_acl=yes
NEON_NEED_XML_PARSER=no
neon_xml_parser_message="none needed"
])

dnl Turn off zlib support
AC_DEFUN([NEON_WITHOUT_ZLIB], [
define(neon_no_zlib, yes)
])

AC_DEFUN([NEON_WITHOUT_ACL], [
# Turn off ACL support
neon_no_acl=yes
])

dnl Common macro to NEON_LIBTOOL_BUILD and NEON_NORMAL_BUILD
dnl Sets NEONOBJS appropriately if it has not already been set.
dnl 
dnl NOT FOR EXTERNAL USE: use LIBTOOL_BUILD or NORMAL_BUILD.
dnl

AC_DEFUN([NEON_COMMON_BUILD], [

# Using the default set of object files to build.
# Add the extension to EXTRAOBJS
ne="$NEON_EXTRAOBJS"
NEON_EXTRAOBJS=
for o in $ne; do
	NEON_EXTRAOBJS="$NEON_EXTRAOBJS $o.$NEON_OBJEXT"
done

# Was DAV support explicitly turned off?
if test "x$neon_no_webdav" = "xyes"; then
  # No WebDAV support
  NEONOBJS="$NEONOBJS \$(NEON_BASEOBJS)"
  NE_DISABLE_SUPPORT(DAV, [WebDAV support is not enabled])
  NE_ADD_ABITAG(NODAV)
else
  # WebDAV support
  NEONOBJS="$NEONOBJS \$(NEON_DAVOBJS)"
  NE_ENABLE_SUPPORT(DAV, [WebDAV support is enabled])
fi

AC_SUBST(NEON_TARGET)
AC_SUBST(NEON_OBJEXT)
AC_SUBST(NEONOBJS)
AC_SUBST(NEON_EXTRAOBJS)
AC_SUBST(NEON_LINK_FLAGS)

])

# The libtoolized build case:
AC_DEFUN([NEON_LIBTOOL_BUILD], [

NEON_TARGET=libneon.la
NEON_OBJEXT=lo

NEON_COMMON_BUILD($#, $*)

])

dnl Find 'ar' and 'ranlib', fail if ar isn't found.
AC_DEFUN([NE_FIND_AR], [

# Search in /usr/ccs/bin for Solaris
ne_PATH=$PATH:/usr/ccs/bin
AC_PATH_TOOL(AR, ar, notfound, $ne_PATH)
if test "x$AR" = "xnotfound"; then
   AC_MSG_ERROR([could not find ar tool])
fi
AC_PATH_TOOL(RANLIB, ranlib, :, $ne_PATH)

])

# The non-libtool build case:
AC_DEFUN([NEON_NORMAL_BUILD], [

NEON_TARGET=libneon.a
NEON_OBJEXT=o

AC_REQUIRE([NE_FIND_AR])

NEON_COMMON_BUILD($#, $*)

])

AC_DEFUN([NE_SNPRINTF], [
AC_CHECK_FUNCS(snprintf vsnprintf,,[
   ne_save_LIBS=$LIBS
   LIBS="$LIBS -lm"    # Always need -lm
   AC_CHECK_LIB(trio, trio_vsnprintf,
   [AC_CHECK_HEADERS(trio.h,,
    AC_MSG_ERROR([trio installation problem? libtrio found but not trio.h]))
    AC_MSG_NOTICE(using trio printf replacement library)
    NEON_LIBS="$NEON_LIBS -ltrio -lm"
    AC_DEFINE(HAVE_TRIO, 1, [Use trio printf replacement library])],
   [AC_MSG_NOTICE([no vsnprintf/snprintf detected in C library])
    AC_MSG_ERROR([Install the trio library from http://daniel.haxx.se/projects/trio/])])
   LIBS=$ne_save_LIBS
   break
])])

dnl Usage: NE_CHECK_OPENSSLVER(variable, version-string, version-hex)
dnl Define 'variable' to 'yes' if OpenSSL version is >= version-hex
AC_DEFUN([NE_CHECK_OPENSSLVER], [
AC_CACHE_CHECK([OpenSSL version is >= $2], $1, [
AC_EGREP_CPP(good, [#include <openssl/opensslv.h>
#if OPENSSL_VERSION_NUMBER >= $3
good
#endif], [$1=yes], [$1=no])])])

dnl Less noisy replacement for PKG_CHECK_MODULES
AC_DEFUN([NE_PKG_CONFIG], [

m4_define([ne_cvar], m4_translit(ne_cv_pkg_[$2], [.-], [__]))dnl

AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
if test "$PKG_CONFIG" = "no"; then
   : Not using pkg-config
   $4
else
   AC_CACHE_CHECK([for $2 pkg-config data], ne_cvar,
     [if $PKG_CONFIG $2; then
        ne_cvar=yes
      else
        ne_cvar=no
      fi])

   if test "$ne_cvar" = "yes"; then
      $1_CFLAGS=`$PKG_CONFIG --cflags $2`
      $1_LIBS=`$PKG_CONFIG --libs $2`
      : Using provided pkg-config data
      $3
   else
      : No pkg-config for $2 provided
      $4
   fi
fi

m4_undefine([ne_cvar])
])

dnl Check for an SSL library (GNU TLS or OpenSSL)
AC_DEFUN([NEON_SSL], [

AC_ARG_WITH(ssl,
            AS_HELP_STRING([--with-ssl=openssl|gnutls],
                           [enable SSL support (default OpenSSL)]))

AC_ARG_WITH(egd,
[[  --with-egd[=PATH]       enable EGD support [using EGD socket at PATH]]])

AC_ARG_WITH(pakchois,
            AS_HELP_STRING([--without-pakchois],
                           [disable support for PKCS#11 using pakchois]))

case $with_ssl in
/*)
   AC_MSG_NOTICE([to use SSL libraries in non-standard locations, try --with-ssl --with-libs=$with_ssl])
   AC_MSG_ERROR([--with-ssl does not take a path argument])
   ;;
yes|openssl)
   NE_PKG_CONFIG(NE_SSL, openssl,
    [AC_MSG_NOTICE(using SSL library configuration from pkg-config)
     CPPFLAGS="$CPPFLAGS ${NE_SSL_CFLAGS}"
     NEON_LIBS="$NEON_LIBS ${NE_SSL_LIBS}"],
    [# Either OpenSSL library may require -ldl if built with dynamic engine support
     NE_SEARCH_LIBS(RSA_new, crypto, -ldl)
     NE_SEARCH_LIBS(SSL_library_init, ssl, -ldl)])

   AC_CHECK_HEADERS(openssl/ssl.h openssl/opensslv.h,,
   [AC_MSG_ERROR([OpenSSL headers not found, cannot enable SSL support])])

   # Enable EGD support if using 0.9.7 or newer
   NE_CHECK_OPENSSLVER(ne_cv_lib_ssl097, 0.9.7, 0x00907000L)
   if test "$ne_cv_lib_ssl097" = "yes"; then
      AC_MSG_NOTICE([OpenSSL >= 0.9.7; EGD support not needed in neon])
      NE_ENABLE_SUPPORT(SSL, [SSL support enabled, using OpenSSL (0.9.7 or later)])
      NE_CHECK_FUNCS(CRYPTO_set_idptr_callback SSL_SESSION_cmp)
   else
      # Fail if OpenSSL is older than 0.9.6
      NE_CHECK_OPENSSLVER(ne_cv_lib_ssl096, 0.9.6, 0x00906000L)
      if test "$ne_cv_lib_ssl096" != "yes"; then
         AC_MSG_ERROR([OpenSSL 0.9.6 or later is required])
      fi
      NE_ENABLE_SUPPORT(SSL, [SSL support enabled, using OpenSSL (0.9.6 or later)])

      case "$with_egd" in
      yes|no) ne_cv_lib_sslegd=$with_egd ;;
      /*) ne_cv_lib_sslegd=yes
          AC_DEFINE_UNQUOTED([EGD_PATH], "$with_egd", 
			     [Define to specific EGD socket path]) ;;
      *) # Guess whether EGD support is needed
         AC_CACHE_CHECK([whether to enable EGD support], [ne_cv_lib_sslegd],
	 [if test -r /dev/random || test -r /dev/urandom; then
	    ne_cv_lib_sslegd=no
	  else
	    ne_cv_lib_sslegd=yes
	  fi])
	 ;;
      esac
      if test "$ne_cv_lib_sslegd" = "yes"; then
        AC_MSG_NOTICE([EGD support enabled for seeding OpenSSL PRNG])
        AC_DEFINE([ENABLE_EGD], 1, [Define if EGD should be supported])
      fi
   fi

   AC_DEFINE([HAVE_OPENSSL], 1, [Define if OpenSSL support is enabled])
   NEON_EXTRAOBJS="$NEON_EXTRAOBJS ne_openssl"

   AC_DEFINE([HAVE_NTLM], 1, [Define if NTLM is supported])
   ;;
gnutls)
   NE_PKG_CONFIG(NE_SSL, gnutls,
     [AC_MSG_NOTICE(using GnuTLS configuration from pkg-config)
      CPPFLAGS="$CPPFLAGS ${NE_SSL_CFLAGS}"
      NEON_LIBS="$NEON_LIBS ${NE_SSL_LIBS}"

      ne_gnutls_ver=`$PKG_CONFIG --modversion gnutls`
     ], [
      # Fall back on libgnutls-config script
      AC_PATH_PROG(GNUTLS_CONFIG, libgnutls-config, no)

      if test "$GNUTLS_CONFIG" = "no"; then
        AC_MSG_ERROR([could not find libgnutls-config in \$PATH])
      fi

      CPPFLAGS="$CPPFLAGS `$GNUTLS_CONFIG --cflags`"
      NEON_LIBS="$NEON_LIBS `$GNUTLS_CONFIG --libs`"

      ne_gnutls_ver=`$GNUTLS_CONFIG --version`
     ])

   AC_CHECK_HEADER([gnutls/gnutls.h],,
      [AC_MSG_ERROR([could not find gnutls/gnutls.h in include path])])

   NE_ENABLE_SUPPORT(SSL, [SSL support enabled, using GnuTLS $ne_gnutls_ver])
   NEON_EXTRAOBJS="$NEON_EXTRAOBJS ne_gnutls"
   AC_DEFINE([HAVE_GNUTLS], 1, [Define if GnuTLS support is enabled])

   # Check for functions in later releases
   NE_CHECK_FUNCS([gnutls_session_get_data2 gnutls_x509_dn_get_rdn_ava \
                  gnutls_certificate_get_issuer \
                  gnutls_certificate_get_x509_cas \
                  gnutls_x509_crt_sign2 \
                  gnutls_certificate_set_retrieve_function2 \
                  gnutls_privkey_import_ext])

   # fail if gnutls_x509_crt_sign2 is not found (it was introduced in 1.2.0, which is required)
   if test x${ac_cv_func_gnutls_x509_crt_sign2} != xyes; then
       AC_MSG_ERROR([GnuTLS version predates gnutls_x509_crt_sign2, newer version required (at least 1.2.0)])
   fi
                  
   # Check for iconv support if using the new RDN access functions:
   if test ${ac_cv_func_gnutls_x509_dn_get_rdn_ava}X${ac_cv_header_iconv_h} = yesXyes; then
      AC_CHECK_FUNCS(iconv)
   fi
   ;;
*) # Default to off; only create crypto-enabled binaries if requested.
   NE_DISABLE_SUPPORT(SSL, [SSL support is not enabled])
   NE_DISABLE_SUPPORT(TS_SSL, [Thread-safe SSL support is not enabled])
   NEON_EXTRAOBJS="$NEON_EXTRAOBJS ne_stubssl"
   ;;
esac
AC_SUBST(NEON_SUPPORTS_SSL)

AC_ARG_WITH(ca-bundle, 
  AS_HELP_STRING(--with-ca-bundle, specify filename of an SSL CA root bundle),,
  with_ca_bundle=no)

case ${NE_FLAG_SSL}-${with_ca_bundle} in
*-no) ;;
yes-*)
   AC_DEFINE_UNQUOTED([NE_SSL_CA_BUNDLE], ["${with_ca_bundle}"],
                      [Define to be filename of an SSL CA root bundle])
   AC_MSG_NOTICE([Using ${with_ca_bundle} as default SSL CA bundle])
   ;;
esac

AC_ARG_ENABLE(threadsafe-ssl,
AS_HELP_STRING(--enable-threadsafe-ssl=posix, 
[enable SSL library thread-safety using POSIX threads: suitable
CC/CFLAGS/LIBS must be used to make the POSIX library interfaces
available]),,
enable_threadsafe_ssl=no)

case $enable_threadsafe_ssl in
posix|yes)
  ne_pthr_ok=yes
  AC_CHECK_FUNCS([pthread_mutex_init pthread_mutex_lock],,[ne_pthr_ok=no])
  if test "${ne_pthr_ok}" = "no"; then
     AC_MSG_ERROR([could not find POSIX mutex interfaces; (try CC="${CC} -pthread"?)])    
  fi
  NE_ENABLE_SUPPORT(TS_SSL, [Thread-safe SSL supported using POSIX threads])
  ;;
*)
  NE_DISABLE_SUPPORT(TS_SSL, [Thread-safe SSL not supported])
  ;;
esac

case ${with_pakchois}X${ac_cv_func_gnutls_privkey_import_ext}Y${ne_cv_lib_ssl097} in
noX*Y*) ;;
*X*Yyes|*XyesY*)
    # PKCS#11... ho!
    NE_PKG_CONFIG(NE_PK11, pakchois,
      [AC_MSG_NOTICE([[using pakchois for PKCS#11 support]])
       AC_DEFINE(HAVE_PAKCHOIS, 1, [Define if pakchois library supported])
       CPPFLAGS="$CPPFLAGS ${NE_PK11_CFLAGS}"
       NEON_LIBS="${NEON_LIBS} ${NE_PK11_LIBS}"],
      [AC_MSG_NOTICE([[pakchois library not found; no PKCS#11 support]])])
   ;;
esac
]) dnl -- end defun NEON_SSL

dnl Check for Kerberos installation
AC_DEFUN([NEON_GSSAPI], [
AC_ARG_WITH(gssapi, AS_HELP_STRING(--without-gssapi, disable GSSAPI support))
if test "$with_gssapi" != "no"; then
  AC_PATH_PROG([KRB5_CONFIG], krb5-config, none, $PATH:/usr/kerberos/bin)
else
  KRB5_CONFIG=none
fi
if test "x$KRB5_CONFIG" != "xnone"; then
   ne_save_CPPFLAGS=$CPPFLAGS
   ne_save_LIBS=$NEON_LIBS
   NEON_LIBS="$NEON_LIBS `${KRB5_CONFIG} --libs gssapi`"
   CPPFLAGS="$CPPFLAGS `${KRB5_CONFIG} --cflags gssapi`"
   # MIT and Heimdal put gssapi.h in different places
   AC_CHECK_HEADERS(gssapi/gssapi.h gssapi.h, [
     NE_CHECK_FUNCS(gss_init_sec_context, [
      ne_save_CPPFLAGS=$CPPFLAGS
      ne_save_LIBS=$NEON_LIBS
      AC_MSG_NOTICE([GSSAPI authentication support enabled])
      AC_DEFINE(HAVE_GSSAPI, 1, [Define if GSSAPI support is enabled])
      AC_CHECK_HEADERS(gssapi/gssapi_generic.h)
      # Older versions of MIT Kerberos lack GSS_C_NT_HOSTBASED_SERVICE
      AC_CHECK_DECL([GSS_C_NT_HOSTBASED_SERVICE],,
        [AC_DEFINE([GSS_C_NT_HOSTBASED_SERVICE], gss_nt_service_name, 
          [Define if GSS_C_NT_HOSTBASED_SERVICE is not defined otherwise])],
        [#ifdef HAVE_GSSAPI_GSSAPI_H
#include <gssapi/gssapi.h>
#else
#include <gssapi.h>
#endif])])
     break
   ])
   CPPFLAGS=$ne_save_CPPFLAGS
   NEON_LIBS=$ne_save_LIBS
fi])

AC_DEFUN([NEON_LIBPROXY], [
AC_ARG_WITH(libproxy, AS_HELP_STRING(--without-libproxy, disable libproxy support))
if test "x$with_libproxy" != "xno"; then
   NE_PKG_CONFIG(NE_PXY, libproxy-1.0,
     [AC_DEFINE(HAVE_LIBPROXY, 1, [Define if libproxy is supported])
      CPPFLAGS="$CPPFLAGS $NE_PXY_CFLAGS"
      NEON_LIBS="$NEON_LIBS ${NE_PXY_LIBS}"
      NE_ENABLE_SUPPORT(LIBPXY, [libproxy support enabled])],
     [NE_DISABLE_SUPPORT(LIBPXY, [libproxy support not enabled])])
else
   NE_DISABLE_SUPPORT(LIBPXY, [libproxy support not enabled])
fi
])   

dnl Adds an --enable-warnings argument to configure to allow enabling
dnl compiler warnings
AC_DEFUN([NEON_WARNINGS],[

AC_REQUIRE([AC_PROG_CC]) dnl so that $GCC is set

AC_ARG_ENABLE(warnings,
AS_HELP_STRING(--enable-warnings, [enable compiler warnings]))

if test "$enable_warnings" = "yes"; then
   case $GCC:`uname` in
   yes:*)
      CFLAGS="$CFLAGS -Wall -Wmissing-declarations -Wshadow -Wreturn-type -Wsign-compare -Wundef -Wpointer-arith -Wbad-function-cast -Wformat-security"
      if test -z "$with_ssl" -o "$with_ssl" = "no"; then
	 # OpenSSL headers fail strict prototypes checks
	 CFLAGS="$CFLAGS -Wstrict-prototypes"
      fi
      ;;
   no:OSF1) CFLAGS="$CFLAGS -check -msg_disable returnchecks -msg_disable alignment -msg_disable overflow" ;;
   no:IRIX) CFLAGS="$CFLAGS -fullwarn" ;;
   no:UnixWare) CFLAGS="$CFLAGS -v" ;;
   *) AC_MSG_WARN([warning flags unknown for compiler on this platform]) ;;
   esac
fi
])

dnl Adds an --disable-debug argument to configure to allow disabling
dnl debugging messages.
dnl Usage:
dnl  NEON_WARNINGS([actions-if-debug-enabled], [actions-if-debug-disabled])
dnl
AC_DEFUN([NEON_DEBUG], [

AC_ARG_ENABLE(debug,
AS_HELP_STRING(--disable-debug,[disable runtime debugging messages]))

# default is to enable debugging
case $enable_debug in
no) AC_MSG_NOTICE([debugging is disabled])
$2 ;;
*) AC_MSG_NOTICE([debugging is enabled])
AC_DEFINE(NE_DEBUGGING, 1, [Define to enable debugging])
$1
;;
esac])

dnl Macro to optionally enable socks support
AC_DEFUN([NEON_SOCKS], [
])

AC_DEFUN([NEON_WITH_LIBS], [
AC_ARG_WITH([libs],
[[  --with-libs=DIR[:DIR2...] look for support libraries in DIR/{bin,lib,include}]],
[case $with_libs in
yes|no) AC_MSG_ERROR([--with-libs must be passed a directory argument]) ;;
*) ne_save_IFS=$IFS; IFS=:
   for dir in $with_libs; do
     ne_add_CPPFLAGS="$ne_add_CPPFLAGS -I${dir}/include"
     ne_add_LDFLAGS="$ne_add_LDFLAGS -L${dir}/lib"
     ne_add_PATH="${ne_add_PATH}${dir}/bin:"
     PKG_CONFIG_PATH=${PKG_CONFIG_PATH}${PKG_CONFIG_PATH+:}${dir}/lib/pkgconfig
   done
   IFS=$ne_save_IFS
   CPPFLAGS="${ne_add_CPPFLAGS} $CPPFLAGS"
   LDFLAGS="${ne_add_LDFLAGS} $LDFLAGS"
   PATH=${ne_add_PATH}$PATH 
   export PKG_CONFIG_PATH ;;
esac])])

AC_DEFUN([NEON_I18N], [

dnl Check for NLS iff libintl.h was detected.
AC_ARG_ENABLE(nls, 
  AS_HELP_STRING(--disable-nls, [disable internationalization support]),,
  [enable_nls=${ac_cv_header_libintl_h}])

if test x${enable_nls} = xyes; then
  # presume that dgettext() is available if bindtextdomain() is...
  # checking for dgettext() itself is awkward because gcc has a 
  # builtin of that function, which confuses AC_CHECK_FUNCS et al.
  NE_SEARCH_LIBS(bindtextdomain, intl, -liconv ,[enable_nls=no])
  NE_CHECK_FUNCS(bind_textdomain_codeset)
fi

if test "$enable_nls" = "no"; then
  NE_DISABLE_SUPPORT(I18N, [Internationalization support not enabled])
else
  NE_ENABLE_SUPPORT(I18N, [Internationalization support enabled])
  eval localedir="${datadir}/locale"
  AC_DEFINE_UNQUOTED([LOCALEDIR], "$localedir", 
                     [Define to be location of localedir])
fi

])