dnl Configure paths for LIBXML2
dnl Mike Hommey 2004-06-19
dnl use CPPFLAGS instead of CFLAGS
dnl Toshio Kuratomi 2001-04-21
dnl Adapted from:
dnl Configure paths for GLIB
dnl Owen Taylor     97-11-3

dnl AM_PATH_XML2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for XML, and define XML_CPPFLAGS and XML_LIBS
dnl
AC_DEFUN([AM_PATH_XML2],[ 
AC_ARG_WITH(xml-prefix,
            [  --with-xml-prefix=PFX   Prefix where libxml is installed (optional)],
            xml_config_prefix="$withval", xml_config_prefix="")
AC_ARG_WITH(xml-exec-prefix,
            [  --with-xml-exec-prefix=PFX Exec prefix where libxml is installed (optional)],
            xml_config_exec_prefix="$withval", xml_config_exec_prefix="")
AC_ARG_ENABLE(xmltest,
              [  --disable-xmltest       Do not try to compile and run a test LIBXML program],,
              enable_xmltest=yes)

  if test x$xml_config_exec_prefix != x ; then
     xml_config_args="$xml_config_args"
     if test x${XML2_CONFIG+set} != xset ; then
        XML2_CONFIG=$xml_config_exec_prefix/bin/xml2-config
     fi
  fi
  if test x$xml_config_prefix != x ; then
     xml_config_args="$xml_config_args --prefix=$xml_config_prefix"
     if test x${XML2_CONFIG+set} != xset ; then
        XML2_CONFIG=$xml_config_prefix/bin/xml2-config
     fi
  fi

  AC_PATH_PROG(XML2_CONFIG, xml2-config, no)
  min_xml_version=ifelse([$1], ,2.0.0,[$1])
  AC_MSG_CHECKING(for libxml - version >= $min_xml_version)
  no_xml=""
  if test "$XML2_CONFIG" = "no" ; then
    no_xml=yes
  else
    XML_CPPFLAGS=`$XML2_CONFIG $xml_config_args --cflags`
    XML_LIBS=`$XML2_CONFIG $xml_config_args --libs`
    xml_config_major_version=`$XML2_CONFIG $xml_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    xml_config_minor_version=`$XML2_CONFIG $xml_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    xml_config_micro_version=`$XML2_CONFIG $xml_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
    if test "x$enable_xmltest" = "xyes" ; then
      ac_save_CPPFLAGS="$CPPFLAGS"
      ac_save_LIBS="$LIBS"
      CPPFLAGS="$CPPFLAGS $XML_CPPFLAGS"
      LIBS="$XML_LIBS $LIBS"
dnl
dnl Now check if the installed libxml is sufficiently new.
dnl (Also sanity checks the results of xml2-config to some extent)
dnl
      rm -f conf.xmltest
      AC_TRY_RUN([
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libxml/xmlversion.h>

int 
main()
{
  int xml_major_version, xml_minor_version, xml_micro_version;
  int major, minor, micro;
  char *tmp_version;

  system("touch conf.xmltest");

  /* Capture xml2-config output via autoconf/configure variables */
  /* HP/UX 9 (%@#!) writes to sscanf strings */
  tmp_version = (char *)strdup("$min_xml_version");
  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
     printf("%s, bad version string from xml2-config\n", "$min_xml_version");
     exit(1);
   }
   free(tmp_version);

   /* Capture the version information from the header files */
   tmp_version = (char *)strdup(LIBXML_DOTTED_VERSION);
   if (sscanf(tmp_version, "%d.%d.%d", &xml_major_version, &xml_minor_version, &xml_micro_version) != 3) {
     printf("%s, bad version string from libxml includes\n", "LIBXML_DOTTED_VERSION");
     exit(1);
   }
   free(tmp_version);

 /* Compare xml2-config output to the libxml headers */
  if ((xml_major_version != $xml_config_major_version) ||
      (xml_minor_version != $xml_config_minor_version) ||
      (xml_micro_version != $xml_config_micro_version))
    {
      printf("*** libxml header files (version %d.%d.%d) do not match\n",
         xml_major_version, xml_minor_version, xml_micro_version);
      printf("*** xml2-config (version %d.%d.%d)\n",
         $xml_config_major_version, $xml_config_minor_version, $xml_config_micro_version);
      return 1;
    } 
/* Compare the headers to the library to make sure we match */
  /* Less than ideal -- doesn't provide us with return value feedback, 
   * only exits if there's a serious mismatch between header and library.
   */
    LIBXML_TEST_VERSION;

    /* Test that the library is greater than our minimum version */
    if ((xml_major_version > major) ||
        ((xml_major_version == major) && (xml_minor_version > minor)) ||
        ((xml_major_version == major) && (xml_minor_version == minor) &&
        (xml_micro_version >= micro)))
      {
        return 0;
       }
     else
      {
        printf("\n*** An old version of libxml (%d.%d.%d) was found.\n",
               xml_major_version, xml_minor_version, xml_micro_version);
        printf("*** You need a version of libxml newer than %d.%d.%d. The latest version of\n",
           major, minor, micro);
        printf("*** libxml is always available from ftp://ftp.xmlsoft.org.\n");
        printf("***\n");
        printf("*** If you have already installed a sufficiently new version, this error\n");
        printf("*** probably means that the wrong copy of the xml2-config shell script is\n");
        printf("*** being found. The easiest way to fix this is to remove the old version\n");
        printf("*** of LIBXML, but you can also set the XML2_CONFIG environment to point to the\n");
        printf("*** correct copy of xml2-config. (In this case, you will have to\n");
        printf("*** modify your LD_LIBRARY_PATH enviroment variable, or edit /etc/ld.so.conf\n");
        printf("*** so that the correct libraries are found at run-time))\n");
    }
  return 1;
}
],, no_xml=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
       CPPFLAGS="$ac_save_CPPFLAGS"
       LIBS="$ac_save_LIBS"
     fi
  fi

  if test "x$no_xml" = x ; then
     AC_MSG_RESULT(yes (version $xml_config_major_version.$xml_config_minor_version.$xml_config_micro_version))
     ifelse([$2], , :, [$2])     
  else
     AC_MSG_RESULT(no)
     if test "$XML2_CONFIG" = "no" ; then
       echo "*** The xml2-config script installed by LIBXML could not be found"
       echo "*** If libxml was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the XML2_CONFIG environment variable to the"
       echo "*** full path to xml2-config."
     else
       if test -f conf.xmltest ; then
        :
       else
          echo "*** Could not run libxml test program, checking why..."
          CPPFLAGS="$CPPFLAGS $XML_CPPFLAGS"
          LIBS="$LIBS $XML_LIBS"
          AC_TRY_LINK([
#include <libxml/xmlversion.h>
#include <stdio.h>
],      [ LIBXML_TEST_VERSION; return 0;],
        [ echo "*** The test program compiled, but did not run. This usually means"
          echo "*** that the run-time linker is not finding LIBXML or finding the wrong"
          echo "*** version of LIBXML. If it is not finding LIBXML, you'll need to set your"
          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
          echo "*** is required on your system"
          echo "***"
          echo "*** If you have an old version installed, it is best to remove it, although"
          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH" ],
        [ echo "*** The test program failed to compile or link. See the file config.log for the"
          echo "*** exact error that occured. This usually means LIBXML was incorrectly installed"
          echo "*** or that you have moved LIBXML since it was installed. In the latter case, you"
          echo "*** may want to edit the xml2-config script: $XML2_CONFIG" ])
          CPPFLAGS="$ac_save_CPPFLAGS"
          LIBS="$ac_save_LIBS"
       fi
     fi

     XML_CPPFLAGS=""
     XML_LIBS=""
     ifelse([$3], , :, [$3])
  fi
  AC_SUBST(XML_CPPFLAGS)
  AC_SUBST(XML_LIBS)
  rm -f conf.xmltest
])


##### http://autoconf-archive.cryp.to/acx_pthread.html
#
# SYNOPSIS
#
#   ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
#
# DESCRIPTION
#
#   This macro figures out how to build C programs using POSIX threads.
#   It sets the PTHREAD_LIBS output variable to the threads library and
#   linker flags, and the PTHREAD_CFLAGS output variable to any special
#   C compiler flags that are needed. (The user can also force certain
#   compiler flags/libs to be tested by setting these environment
#   variables.)
#
#   Also sets PTHREAD_CC to any special C compiler that is needed for
#   multi-threaded programs (defaults to the value of CC otherwise).
#   (This is necessary on AIX to use the special cc_r compiler alias.)
#
#   NOTE: You are assumed to not only compile your program with these
#   flags, but also link it with them as well. e.g. you should link
#   with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
#   $LIBS
#
#   If you are only building threads programs, you may wish to use
#   these variables in your default LIBS, CFLAGS, and CC:
#
#          LIBS="$PTHREAD_LIBS $LIBS"
#          CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
#          CC="$PTHREAD_CC"
#
#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
#   constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
#
#   ACTION-IF-FOUND is a list of shell commands to run if a threads
#   library is found, and ACTION-IF-NOT-FOUND is a list of commands to
#   run it if it is not found. If ACTION-IF-FOUND is not specified, the
#   default action will define HAVE_PTHREAD.
#
#   Please let the authors know if this macro fails on any platform, or
#   if you have any other suggestions or comments. This macro was based
#   on work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/)
#   (with help from M. Frigo), as well as ac_pthread and hb_pthread
#   macros posted by Alejandro Forero Cuervo to the autoconf macro
#   repository. We are also grateful for the helpful feedback of
#   numerous users.
#
# LAST MODIFICATION
#
#   2007-07-29
#
# COPYLEFT
#
#   Copyright (c) 2007 Steven G. Johnson <stevenj@alum.mit.edu>
#
#   This program is free software: you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation, either version 3 of the
#   License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program. If not, see
#   <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright
#   owner gives unlimited permission to copy, distribute and modify the
#   configure scripts that are the output of Autoconf when processing
#   the Macro. You need not follow the terms of the GNU General Public
#   License when using or distributing such scripts, even though
#   portions of the text of the Macro appear in them. The GNU General
#   Public License (GPL) does govern all other use of the material that
#   constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the
#   Autoconf Macro released by the Autoconf Macro Archive. When you
#   make and distribute a modified version of the Autoconf Macro, you
#   may extend this special exception to the GPL to apply to your
#   modified version as well.

AC_DEFUN([ACX_PTHREAD], [
AC_REQUIRE([AC_CANONICAL_HOST])
AC_LANG_SAVE
AC_LANG_C
acx_pthread_ok=no

# We used to check for pthread.h first, but this fails if pthread.h
# requires special compiler flags (e.g. on True64 or Sequent).
# It gets checked for in the link test anyway.

# First of all, check if the user has set any of the PTHREAD_LIBS,
# etcetera environment variables, and if threads linking works using
# them:
if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
        AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
        AC_MSG_RESULT($acx_pthread_ok)
        if test x"$acx_pthread_ok" = xno; then
                PTHREAD_LIBS=""
                PTHREAD_CFLAGS=""
        fi
        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"
fi

# We must check for the threads library under a number of different
# names; the ordering is very important because some systems
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
# libraries is broken (non-POSIX).

# Create a list of thread flags to try.  Items starting with a "-" are
# C compiler flags, and other items are library names, except for "none"
# which indicates that we try without any flags at all, and "pthread-config"
# which is a program returning the flags for the Pth emulation library.

acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"

# The ordering *is* (sometimes) important.  Some notes on the
# individual items follow:

# pthreads: AIX (must check this before -lpthread)
# none: in case threads are in libc; should be tried before -Kthread and
#       other compiler flags to prevent continual compiler warnings
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
# -pthreads: Solaris/gcc
# -mthreads: Mingw32/gcc, Lynx/gcc
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
#      doesn't hurt to check since this sometimes defines pthreads too;
#      also defines -D_REENTRANT)
#      ... -mt is also the pthreads flag for HP/aCC
# pthread: Linux, etcetera
# --thread-safe: KAI C++
# pthread-config: use pthread-config program (for GNU Pth library)

case "${host_cpu}-${host_os}" in
        *solaris*)

        # On Solaris (at least, for some versions), libc contains stubbed
        # (non-functional) versions of the pthreads routines, so link-based
        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
        # a function called by this macro, so we could check for that, but
        # who knows whether they'll stub that too in a future libc.)  So,
        # we'll just look for -pthreads and -lpthread first:

        acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
        ;;
esac

if test x"$acx_pthread_ok" = xno; then
for flag in $acx_pthread_flags; do

        case $flag in
                none)
                AC_MSG_CHECKING([whether pthreads work without any flags])
                ;;

                -*)
                AC_MSG_CHECKING([whether pthreads work with $flag])
                PTHREAD_CFLAGS="$flag"
                ;;

		pthread-config)
		AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
		if test x"$acx_pthread_config" = xno; then continue; fi
		PTHREAD_CFLAGS="`pthread-config --cflags`"
		PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
		;;

                *)
                AC_MSG_CHECKING([for the pthreads library -l$flag])
                PTHREAD_LIBS="-l$flag"
                ;;
        esac

        save_LIBS="$LIBS"
        save_CFLAGS="$CFLAGS"
        LIBS="$PTHREAD_LIBS $LIBS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

        # Check for various functions.  We must include pthread.h,
        # since some functions may be macros.  (On the Sequent, we
        # need a special flag -Kthread to make this header compile.)
        # We check for pthread_join because it is in -lpthread on IRIX
        # while pthread_create is in libc.  We check for pthread_attr_init
        # due to DEC craziness with -lpthreads.  We check for
        # pthread_cleanup_push because it is one of the few pthread
        # functions on Solaris that doesn't have a non-functional libc stub.
        # We try pthread_create on general principles.
        AC_TRY_LINK([#include <pthread.h>],
                    [pthread_t th; pthread_join(th, 0);
                     pthread_attr_init(0); pthread_cleanup_push(0, 0);
                     pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
                    [acx_pthread_ok=yes])

        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        AC_MSG_RESULT($acx_pthread_ok)
        if test "x$acx_pthread_ok" = xyes; then
                break;
        fi

        PTHREAD_LIBS=""
        PTHREAD_CFLAGS=""
done
fi

# Various other checks:
if test "x$acx_pthread_ok" = xyes; then
        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
	AC_MSG_CHECKING([for joinable pthread attribute])
	attr_name=unknown
	for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
	    AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
                        [attr_name=$attr; break])
	done
        AC_MSG_RESULT($attr_name)
        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
            AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
                               [Define to necessary symbol if this constant
                                uses a non-standard name on your system.])
        fi

        AC_MSG_CHECKING([if more special flags are required for pthreads])
        flag=no
        case "${host_cpu}-${host_os}" in
            *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
            *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
        esac
        AC_MSG_RESULT(${flag})
        if test "x$flag" != xno; then
            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
        fi

        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        # More AIX lossage: must compile with xlc_r or cc_r
	if test x"$GCC" != xyes; then
          AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
        else
          PTHREAD_CC=$CC
	fi
else
        PTHREAD_CC="$CC"
fi

AC_SUBST(PTHREAD_LIBS)
AC_SUBST(PTHREAD_CFLAGS)
AC_SUBST(PTHREAD_CC)

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_pthread_ok" = xyes; then
        ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
        :
else
        acx_pthread_ok=no
        $2
fi
AC_LANG_RESTORE
])dnl ACX_PTHREAD