path: root/configure.in

dnl Process this file with autoconf to produce configure.
dnl
dnl Copyright by The HDF Group.
dnl Copyright by the Board of Trustees of the University of Illinois.
dnl All rights reserved.
dnl
dnl This file is part of HDF5.  The full HDF5 copyright notice, including
dnl terms governing use, modification, and redistribution, is contained in
dnl the files COPYING and Copyright.html.  COPYING can be found at the root
dnl of the source code distribution tree; Copyright.html can be found at the
dnl root level of an installed copy of the electronic HDF5 document set and
dnl is linked from the top-level documents page.  It can also be found at
dnl http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have
dnl access to either file, you may request a copy from help@hdfgroup.org.

dnl ----------------------------------------------------------------------
dnl Initialize configure.
dnl
AC_REVISION($Id$)
AC_PREREQ([2.53])

dnl AC_INIT takes the name of the package, the version number, and an
dnl email address to report bugs. AC_CONFIG_SRCDIR takes a unique file
dnl as its argument.
dnl
dnl NOTE: Don't forget to change the version number here when we do a
dnl release!!!
dnl
AC_INIT([HDF5], [1.8.0-beta1post1], [help@hdfgroup.org])
AC_CONFIG_SRCDIR([src/H5.c])
AM_CONFIG_HEADER([src/H5config.h])

AC_CONFIG_AUX_DIR([bin])

dnl AM_INIT_AUTOMAKE takes a list of options that should be applied to
dnl every Makefile.am when automake is run.
AM_INIT_AUTOMAKE([foreign])

dnl AM_MAINTAINER_MODE turns off "rebuild rules" that contain dependencies
dnl for Makefiles, configure, src/H5config.h, etc.  If AM_MAINTAINER_MODE
dnl is *not* included here, these files will be rebuilt if out of date.
dnl This is a problem because if users try to build on a machine with
dnl the wrong versions of autoconf and automake, these files will be
dnl rebuilt with the wrong versions and bad things can happen.
dnl Also, CVS doesn't preserve dependencies between timestamps, so
dnl Makefiles will often think rebuilding needs to occur when it doesn't.
dnl Developers should './configure --enable-maintainer-mode' to turn on
dnl rebuild rules.
AM_MAINTAINER_MODE

AC_OUTPUT_COMMANDS([
  echo "creating src/H5pubconf.h"
  sed 's/#define /#define H5_/' <src/H5config.h |\
    sed 's/#undef /#undef H5_/' >pubconf
  if test ! -f src/H5pubconf.h; then
    /bin/mv -f pubconf src/H5pubconf.h
  elif (diff pubconf src/H5pubconf.h >/dev/null); then
    rm -f pubconf
    echo "src/H5pubconf.h is unchanged"
  else
    /bin/mv -f pubconf src/H5pubconf.h
  fi
])

dnl It's possible to configure for a host other than the one on which
dnl configure is currently running by using the --host=foo flag.
dnl For machines on which HDF5 is often configured, it can be convenient
dnl to specify the name of the machine rather than its canonical type.
case $host_alias in
  redstorm)
    host_alias=x86_64-redstorm-linux-gnu
    ;;
esac

AC_CANONICAL_HOST
AC_SUBST([CPPFLAGS])

dnl H5_CFLAGS (and company) are for CFLAGS that should be used on HDF5, but
dnl not exported to h5cc (or h5fc, etc.)
AC_SUBST([H5_CFLAGS])
AC_SUBST([H5_CPPFLAGS])
AC_SUBST([H5_FCFLAGS])
AC_SUBST([H5_CXXFLAGS])

dnl Make sure flags are set to something (otherwise macros may set them later).
CFLAGS="${CFLAGS}"
CPPFLAGS="${CPPFLAGS}"
CXXFLAGS="${CXXFLAGS}"
FCFLAGS="${FCFLAGS}"

dnl Different compilers may need default libraries. They are specified in
dnl the config/* files, so we put this statement here so that it'll be
dnl set by the code which follows...
dnl
DEFAULT_LIBS=""

dnl Support F9X variable to define Fortran compiler if FC variable is
dnl not used.  This should be depreciated in the future.
if test "x" = "x$FC"; then
  FC=${F9X}
fi

dnl ----------------------------------------------------------------------
dnl Set prefix default (install directory) to a directory in the build area.
dnl This allows multiple src-dir builds within one host.
AC_PREFIX_DEFAULT([`pwd`/hdf5])

dnl ----------------------------------------------------------------------
dnl Dump all shell variables values.
dnl
AC_MSG_CHECKING([shell variables initial values])
set >&AS_MESSAGE_LOG_FD
AC_MSG_RESULT([done])

dnl ----------------------------------------------------------------------
dnl Some platforms have broken basename, and/or xargs programs. Check
dnl that it actually does what it's supposed to do. Catch this early
dnl since configure relies upon them heavily and there's no use continuing
dnl if it's broken.
dnl

dnl Avoid depending upon Character Ranges.
dnl These are defined by autoconf.
dnl as_cr_letters='abcdefghijklmnopqrstuvwxyz'
dnl as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'

AC_MSG_CHECKING([if basename works])
BASENAME_TEST="`basename /foo/bar/baz/qux/basename_works`"
if test $BASENAME_TEST != "basename_works"; then
  AC_MSG_ERROR([basename program doesn't work])
else
  AC_MSG_RESULT([yes])
fi

AC_MSG_CHECKING([if xargs works])
XARGS_TEST="`echo /foo/bar/baz/qux/xargs_works | xargs basename`"
if test $XARGS_TEST != "xargs_works"; then
  AC_MSG_ERROR([xargs program doesn't work])
else
  AC_MSG_RESULT([yes])
fi

dnl ----------------------------------------------------------------------
dnl Check that the cache file was build on the same host as what we're
dnl running on now.
dnl
AC_CACHE_CHECK([for cached host], [hdf5_cv_host], [hdf5_cv_host="none"]);
if test $hdf5_cv_host = "none"; then
  hdf5_cv_host=$host
elif test $hdf5_cv_host != $host; then
  echo "The config.cache file was generated on $hdf5_cv_host but"
  echo "this is $host.  Please remove that file and try again."
  AC_MSG_ERROR(config.cache file is invalid)
fi

dnl ----------------------------------------------------------------------
dnl Source any special files that we need.  These files normally aren't
dnl present but can be used by the maintainers to fine tune things like
dnl turning on debug or profiling flags for the compiler.  The search order
dnl is:
dnl
dnl	CPU-VENDOR-OS
dnl	VENDOR-OS
dnl	CPU-OS
dnl	CPU-VENDOR
dnl	OS
dnl	VENDOR
dnl	CPU
dnl
dnl If the `OS' ends with a version number then remove it. For instance,
dnl `freebsd3.1' would become `freebsd'
case $host_os in
  aix4.*)
    host_os_novers=aix4.x
    ;;
  aix5.*)
    host_os_novers=aix5.x
    ;;
  freebsd*)
    host_os_novers=freebsd
    ;;
  irix5.*)
    host_os_novers=irix5.x
    ;;
  irix6.*)
    host_os_novers=irix6.x
    ;;
  osf4.*)
    host_os_novers=osf4.x
    ;;
  osf5.*)
    host_os_novers=osf5.x
    ;;
  solaris2.*)
    host_os_novers=solaris2.x
    ;;
  *)
    host_os_novers=$host_os
    ;;
esac

AC_ARG_ENABLE([hsizet],
              [AC_HELP_STRING([--disable-hsizet],
                              [Datasets can normally be larger than
                               memory and/or files but some compilers are
                               unable to handle this (including versions
                               of GCC before 2.8.0). Disabling the
                               feature causes dataset sizes to be
                               restricted to the size of core memory, or
                               'size_t'.])],
              [HSIZET=$enableval])

AC_MSG_CHECKING([for sizeof hsize_t and hssize_t])

AC_SUBST(HSIZET)
case $HSIZET in
  no|small)
    AC_MSG_RESULT([small])
    HSIZET=small
    ;;
  *)
    AC_MSG_RESULT([large])
    HSIZET=large
    AC_DEFINE([HAVE_LARGE_HSIZET], [1],
              [Define if it's safe to use `long long' for hsize_t and hssize_t])
    ;;
esac

host_config="none"
for f in $host_cpu-$host_vendor-$host_os \
         $host_cpu-$host_vendor-$host_os_novers \
         $host_vendor-$host_os \
         $host_vendor-$host_os_novers \
         $host_cpu-$host_os \
         $host_cpu-$host_os_novers \
         $host_cpu-$host_vendor \
         $host_os \
         $host_os_novers \
         $host_vendor \
         $host_cpu ; do
  AC_MSG_CHECKING([for config $f])
  if test -f "$srcdir/config/$f"; then
    host_config=$srcdir/config/$f
    AC_MSG_RESULT([found])
    break
  fi
  AC_MSG_RESULT([no])
done
if test "X$host_config" != "Xnone"; then
  CC_BASENAME="`echo $CC | cut -f1 -d' ' | xargs basename 2>/dev/null`"
  . $host_config
fi

dnl Source any special site-specific file
hname="`hostname`"
while test -n "$hname"; do
  file=$srcdir/config/site-specific/host-$hname
  AC_MSG_CHECKING([for config $file])
  if test -f "$file"; then
    . $file
    AC_MSG_RESULT([found])
    break
  fi
  AC_MSG_RESULT([no])
  hname_tmp=$hname
  hname="`echo $hname | cut -d. -f2-99`"
  test "$hname_tmp" = "$hname" && break
done

dnl ----------------------------------------------------------------------
dnl Enable dependency tracking unless the configure options or a
dnl site-specific file told us not to.  This prevents configure from
dnl silently disabling dependencies for some compilers.
dnl
if test -z "${enable_dependency_tracking}"; then
  enable_dependency_tracking="yes"
fi

dnl ----------------------------------------------------------------------
dnl Check for programs.
dnl
AC_PROG_CC
CC_BASENAME="`echo $CC | cut -f1 -d' ' | xargs basename 2>/dev/null`"

dnl ----------------------------------------------------------------------
dnl Check if they would like the Fortran interface compiled
dnl
AC_SUBST([HDF5_INTERFACES]) HDF5_INTERFACES=""
AC_MSG_CHECKING([if Fortran interface enabled])
AC_ARG_ENABLE([fortran],
              [AC_HELP_STRING([--enable-fortran],
                              [Compile the Fortran interface [default=no]])],
              [HDF_FORTRAN=$enableval])

if test "X$HDF_FORTRAN" = "Xyes"; then
  echo "yes"

  HDF5_INTERFACES="$HDF5_INTERFACES fortran"

  dnl --------------------------------------------------------------------
  dnl HDF5 integer variables for the H5fortran_types.f90 file.
  dnl
  AC_SUBST([R_LARGE])
  AC_SUBST([R_INTEGER])
  AC_SUBST([HADDR_T])
  AC_SUBST([HSIZE_T])
  AC_SUBST([HSSIZE_T])
  AC_SUBST([HID_T])
  AC_SUBST([SIZE_T])
  AC_SUBST([OBJECT_NAMELEN_DEFAULT_F])

  dnl --------------------------------------------------------------------
  dnl General Fortran flags
  dnl
  FCFLAGS="${FCFLAGS} ${FFLAGS}"

  dnl --------------------------------------------------------------------
  dnl Fortran source extention
  dnl
  AC_FC_SRCEXT([f90])

  AC_SUBST([F9XSUFFIXFLAG])
  AC_SUBST([FSEARCH_DIRS])

  dnl --------------------------------------------------------------------
  dnl Check for a Fortran 9X compiler and how to include modules.
  dnl 
  AC_PROG_FC([f90 pgf90 slf90 f95 g95 xlf95 efc ifort ftn],)
  AC_F9X_MODS

  dnl It seems that libtool (as of Libtool 1.5.14) is trying to
  dnl configure itself for Fortran 77.
  dnl Tell it that our F77 compiler is $FC (actually a F9X compiler)
  F77=$FC

  dnl Change to the Fortran 90 language
  AC_LANG_PUSH(Fortran)

  dnl --------------------------------------------------------------------
  dnl Define wrappers for the C compiler to use Fortran function names
  dnl
  AC_FC_WRAPPERS

  dnl --------------------------------------------------------------------
  dnl See if the compiler will support the "-I." option
  dnl
dnl  FCFLAGS_saved=$FCFLAGS
dnl  FCFLAGS="${FCFLAGS} -I."

dnl  AC_MSG_CHECKING(if compiler supports -I. option)
dnl  AC_TRY_FCOMPILE([
dnl      program conftest
dnl      end
dnl  ], AC_MSG_RESULT(yes),
dnl     AC_MSG_RESULT(no)
dnl     FCFLAGS="$FCFLAGS_saved")

  dnl Change back to the C language
  AC_LANG_POP(Fortran)
else
  echo "no"
fi

dnl ----------------------------------------------------------------------
dnl Check if they would like the C++ interface compiled
dnl
dnl We need to check for a C++ compiler unconditionally, since
dnl AC_PROG_CXX defines some macros that Automake 1.9.x uses and will
dnl miss even if c++ is not enabled.
  AC_PROG_CXX
  AC_PROG_CXXCPP	dnl this is checked for when AC_HEADER_STDC is done

AC_MSG_CHECKING([if c++ interface enabled])

AC_ARG_ENABLE([cxx],
              [AC_HELP_STRING([--enable-cxx],
                              [Compile the C++ interface [default=no]])],
              [HDF_CXX=$enableval])

if test "X$HDF_CXX" = "Xyes"; then
  echo "yes"
  HDF5_INTERFACES="$HDF5_INTERFACES c++"

  dnl Change to the C++ language
  AC_LANG_PUSH(C++)

  AC_MSG_CHECKING([if $CXX needs old style header files in includes])
  AC_TRY_RUN([
#include <iostream>

int main(void) { return 0; }
  ], [
    echo no
  ], [
    echo yes
    CXXFLAGS="${CXXFLAGS} -DOLD_HEADER_FILENAME"
  ])

  AC_MSG_CHECKING([if $CXX can handle namespaces])
  AC_TRY_RUN([
namespace H5 {
int fnord;
}

int main(void) {
   using namespace H5;
   fnord = 37;
   return 0;
} 
  ], [
     echo yes
  ], [
     echo no
     CXXFLAGS="${CXXFLAGS} -DH5_NO_NAMESPACE"
  ])

  AC_MSG_CHECKING([if $CXX supports std])
  AC_TRY_RUN([
#include <string>

using namespace std;

int main(void) {
   string myString("testing namespace std");
   return 0;
}
  ], [
     echo yes
  ], [
     echo no
     CXXFLAGS="${CXXFLAGS} -DH5_NO_STD"
  ])

  AC_MSG_CHECKING([if $CXX supports bool types])
  AC_TRY_RUN([
int main(void) {
   bool flag;
   return 0;
}
  ], [
     echo yes
  ], [
     echo no
     CXXFLAGS="${CXXFLAGS} -DBOOL_NOTDEFINED"
  ])

  AC_MSG_CHECKING([if $CXX can handle static cast])
  AC_TRY_RUN([
int main(void) {
   float test_float;
   int test_int;
   test_float = 37.0;
   test_int = static_cast <int> (test_float);
   return 0;
}
  ], [
    echo yes
  ], [
    echo no
    CXXFLAGS="${CXXFLAGS} -DNO_STATIC_CAST"
  ])
else
  echo "no"
fi

dnl Change back to the C language
AC_LANG_POP(C++)

dnl ----------------------------------------------------------------------
dnl If we should build only static executables
dnl
AC_MSG_CHECKING([if should build only statically linked executables])
AC_ARG_ENABLE([static_exec],
              [AC_HELP_STRING([--enable-static-exec],
                              [Build only statically linked executables
                               [default=no]])],
              [STATIC_EXEC=$enableval])

if test "X$STATIC_EXEC" = "Xyes"; then
  echo "yes"
  LT_STATIC_EXEC="-all-static"
else
  echo "no"
  LT_STATIC_EXEC=""
fi
AC_SUBST([LT_STATIC_EXEC])

dnl ----------------------------------------------------------------------
dnl Check if they have Perl installed on their system. We only need Perl
dnl if they're using a GNU compiler.
dnl
AC_SUBST([PERL]) PERL=""
if test "X$GCC" = "Xyes"; then
  AC_CHECK_PROGS([PERL], [perl],, [$PATH])
fi


dnl ----------------------------------------------------------------------
dnl Check which archiving tool to use. This needs to be done before
dnl the AM_PROG_LIBTOOL macro.
dnl
if test -z "$AR"; then
  AC_CHECK_PROGS([AR], [ar xar], [:], [$PATH])
fi
AC_SUBST([AR])

dnl Export the AR macro so that it will be placed in the libtool file
dnl correctly.
export AR

AC_PROG_MAKE_SET
AC_PROG_INSTALL


dnl ----------------------------------------------------------------------
dnl Check that the tr utility is working properly.

AC_PATH_PROG(TR, tr)

TR_TEST=`echo Test | ${TR} ${as_cr_letters}"," ${as_cr_LETTERS}" "`
if test "X${TR_TEST}" != "XTEST"; then
  AC_MSG_ERROR([tr program doesn't work])
fi


dnl ----------------------------------------------------------------------
dnl Check that time can be used with srcdir.  This is okay on most systems,
dnl but seems to cause problems on Cygwin.
dnl The solution on Cygwin is not to record execution time for tests.
AC_MSG_CHECKING([if srcdir= and time commands work together])

AC_SUBST([TIME])
TIME=time
TIME_TEST=`foo="bar" ${TIME} echo 'baz' 2> /dev/null | grep baz`

if test "X${TIME_TEST}" = "Xbaz"; then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
  TIME=
fi


dnl The following variables are used to distinguish between building a
dnl serial and parallel library.
dnl
dnl    HAVE_PARALLEL	-- defined in H5config.h if we are building
dnl			   a parallel library even if configure wasn't
dnl			   able to find some header file or library that
dnl			   might be required. This is defined if the
dnl			   compiler looks like a parallel compiler (e.g.,
dnl			   mpicc or mpcc) or if the user explicitly states
dnl			   that a parallel library is being built by supplying
dnl			   the `--enable-parallel' configure switch.
dnl
dnl    PARALLEL		-- This variable is set to a non-null value if
dnl			   configure thinks we're compiling a parallel
dnl			   version of the library.
dnl
dnl    RUNSERIAL	-- This is a command which will be prepended to
dnl			   the executable name to run the executable using
dnl			   a single process. For serial versions of the
dnl			   library this will normally be empty. For parallel
dnl			   versions it might be something like `mpirun -np 1'.
dnl			   The value of this variable is substituted in *.in
dnl			   files.
dnl
dnl    RUNPARALLEL	-- This is a command which will be prepended to
dnl			   the executable name to run the executable on
dnl			   multiple processors. For the serial library the
dnl			   value will normally be the empty string. For
dnl			   parallel library it should be something like
dnl			   `mpi -np $$NPROCS' where NPROCS will eventually
dnl			   contain the number of processors on which to run
dnl			   the executable (the double dollarsigns are to
dnl			   protect the expansion until make executes the
dnl			   command).  The value of this variable is
dnl			   substituted in *.in files.
dnl
AC_SUBST([PARALLEL])
AC_SUBST([RUNSERIAL])
AC_SUBST([RUNPARALLEL])
AC_SUBST([TESTPARALLEL])

dnl ----------------------------------------------------------------------
dnl If the compiler is obviously a parallel compiler then we're building
dnl a parallel version of hdf5 and should define HAVE_PARALLEL. Furthermore,
dnl the name of the compiler might tell us how to run the resulting
dnl executable. For `mpicc' the executable should be run with `mpirun' from
dnl the same directory as mpicc if it exists.
dnl
case "$CC_BASENAME" in
  mpicc)
    dnl The mpich compiler. Use mpirun from the same directory if it
    dnl exists.
    PARALLEL=mpicc
    AC_MSG_CHECKING([for mpirun])

    dnl Find the path where mpicc is located.
    cmd="`echo $CC | cut -f1 -d' '`"
    if (echo $cmd | grep / >/dev/null); then
      path="`echo $cmd | sed 's/\(.*\)\/.*$/\1/'`"
    else
      for path in `echo $PATH | ${TR} ":" " "`; do
        if test -x $path/$cmd; then
          break
        fi
      done
    fi

    dnl Is there an mpirun at that path?
    if test -x $path/mpirun; then
      AC_MSG_RESULT([$path/mpirun])
      RUNSERIAL="${RUNSERIAL:-none}"

      if test -z "$RUNPARALLEL"; then
        RUNPARALLEL="$path/mpirun -np \$\${NPROCS:=3}"
      fi
    else
      AC_MSG_RESULT([none])
    fi
    ;;

  hcc)
    dnl The LAM compiler. Use mpirun_lam or mpirun from the same directory
    dnl if it exists.
    PARALLEL=hcc
    AC_MSG_CHECKING([for mpirun_lam or mpirun])

    dnl Find the path where hcc is located
    cmd="`echo $CC | cut -f1 -d' '`"
    if (echo $cmd | grep / >/dev/null); then
      path="`echo $cmd | sed 's/\(.*\)\/.*$/\1/'`"
    else
      for path in `echo $PATH | ${TR} ":" " "`; do
        if test -x $path/$cmd; then
          break
        fi
      done
    fi

    dnl Is there an mpirun_lam or mpirun at that path?
    if test -x $path/mpirun_lam -o -x $path/mpirun; then
      if test -x $path/mpirun_lam; then
        cmd=mpirun_lam
      else
        cmd=mpirun
      fi
      AC_MSG_RESULT([$path/$cmd])
      RUNSERIAL="${RUNSERIAL:-none}"
      if test -z "$RUNPARALLEL"; then
        RUNPARALLEL="$path/$cmd -np \$\${NPROCS:=3}"
      fi
    else
      AC_MSG_RESULT([none])
    fi
    ;;

  mpcc|mpcc_r)
    dnl The IBM compiler
    PARALLEL="$CC_BASENAME"
    ;;

  *)
    dnl Probably not a parallel compiler, but if `--enable-parallel'
    dnl is defined below then we're still building a parallel hdf5.
    ;;
esac

dnl ----------------------------------------------------------------------
dnl If the Fortran compiler is obviously a parallel compiler then we're
dnl building a parallel version of hdf5 and should define HAVE_PARALLEL.
dnl Furthermore, the name of the compiler might tell us how to run the
dnl resulting executable. For `mpif90' the executable should be run with
dnl `mpirun' from the same directory as mpif90 if it exists.
dnl
if test "X$HDF_FORTRAN" = "Xyes"; then
  dnl Change to the Fortran 90 language
  AC_LANG_PUSH(Fortran)

  case "$FC" in
    *mpif90*)
      dnl The Fortran mpich compiler. Use mpirun from the same directory
      dnl if it exists.
      PARALLEL=mpif90
      AC_MSG_CHECKING([for mpirun])

      dnl Find the path where mpif90 is located.
      cmd=`echo $FC |cut -f1 -d' '`
      if (echo $cmd |grep / >/dev/null); then
        path="`echo $cmd |sed 's/\(.*\)\/.*$/\1/'`"
      else
        for path in `echo $PATH | ${TR} ":" " "`; do
          if test -x $path/$cmd; then
            break;
          fi
        done
      fi

      dnl Is there an mpirun at that path?
      if test -x $path/mpirun; then
        AC_MSG_RESULT([$path/mpirun])
        RUNSERIAL="${RUNSERIAL:-none}"

        if test -z "$RUNPARALLEL"; then
          RUNPARALLEL="$path/mpirun -np \$\${NPROCS:=2}"
        fi
      else
        AC_MSG_RESULT([none])
      fi
      ;;

    *mpxlf* | *mpxlf_r* | *mpxlf90* | *mpxlf90_r* | *mpxlf95* | *mpxlf95_r*)
      dnl The IBM compiler
      PARALLEL="$FC"
      ;;

    *)
      dnl Probably not a parallel compiler, but if `--enable-parallel'
      dnl is defined below then we're still building a parallel hdf5.
      ;;
  esac

  dnl Change to the C language
  AC_LANG_POP(Fortran)
fi

dnl -----------------------------------------------------------------------------
dnl If shared libraries are being used with parallel, disable them, unless the 
dnl user explicity enables them via the '--enable-shared' option.
if test "X${enable_shared}" = "X" -a "X${enable_parallel}" = "Xyes"; then
    echo '    shared libraries disabled in parallel'
    enable_shared="no"
elif test "X${enable_shared}" = "Xyes" -a "X${enable_parallel}" = "Xyes"; then
    echo '    shared libraries explicitly enabled by user'
elif test "X${enable_shared}" = "X" -a "X${PARALLEL}" != "X"; then
    echo '    shared libraries disabled when a parallel compiler is being used'
    enable_shared="no"
elif test "X${enable_shared}" = "Xyes" -a "X${PARALLEL}" != "X"; then
    echo '    shared libraries explicitly enabled by user'
fi

dnl ----------------------------------------------------------------------
dnl As of Libtool 1.5.14, libtool officially doesn't know how to create
dnl shared libraries with pgcc.  In fact, it is able to do so on some
dnl platforms, but not all (e.g., pgcc 5.2-4 on mir).
dnl Disable shared libraries when using pgcc.  -JL 09/2005
if test "X${enable_shared}" != "Xno" && \
      (${CC-cc} -V 2>&1 | grep '^pgcc') > /dev/null; then
  echo '    warning: shared libraries are not supported for pgcc!'
  echo '    disabling shared libraries'
  enable_shared="no"
fi

dnl ----------------------------------------------------------------------
dnl Many Fortran compilers don't support shared libraries.  Some of these
dnl compilers include:
dnl pgf90 version 6.0-4
dnl Absoft 32bit Fortran 95 9.0
dnl HP F90 v2.4
dnl Intel Fortran Compiler 8.1
dnl If any of these compilers is being used, disable shared libraries for
dnl Fortran.  This prevents building shared libraries and also prevents
dnl trying to link against shared libraries.
if test "X${HDF_FORTRAN}" = "Xyes"; then
  H5_FORTRAN_SHARED="yes"

  if (${FC} -V 2>&1 | grep '^pgf90') > /dev/null; then
    H5_FORTRAN_SHARED="no"
  fi

  if (${FC} -V 2>&1 | grep '^Intel(R) Fortran Compiler') > /dev/null; then
    H5_FORTRAN_SHARED="no"
  fi

  if (${FC} +version 2>&1 | grep '^HP F90') > /dev/null; then
    H5_FORTRAN_SHARED="no"
  fi

  if (${FC} -V 2>&1 | grep '^Absoft') > /dev/null; then
    H5_FORTRAN_SHARED="no"
  fi

  if test "X${enable_shared}" != "Xno" && test "X${H5_FORTRAN_SHARED}" = "Xno"; then
    AC_MSG_WARN([shared libraries are not supported; disabling shared Fortran libraries])
  fi

  if test "X${enable_static}" = "Xno" && test "X${H5_FORTRAN_SHARED}" = "Xno"; then
    AC_MSG_ERROR([both static and shared Fortran libraries are disabled])
  fi
fi

AM_CONDITIONAL([FORTRAN_SHARED_CONDITIONAL], [test "X$H5_FORTRAN_SHARED" = "Xyes"])

dnl ----------------------------------------------------------------------
dnl Shared C++ libraries seem not to work on some platforms (modi4, shanti)
dnl when the -xarch=v9 flag is used to enable 64-bit mode.
dnl Try to detect the -xarch=v9 flag and disable C++ shared libraries if it's
dnl being used.
dnl Also disable C++ shared libraries if shared libraries are disabled.
dnl this prevents Automake from trying to link against shared libraries,
dnl which caused problems on tg-login
H5_CXX_SHARED="no"
if test "X${HDF_CXX}" = "Xyes" && test "X${enable_shared}" != "Xno"; then
  H5_CXX_SHARED="yes"

  if (echo dummy ${CXX} ${CXXLD} ${CFLAGS} ${CXXFLAGS} ${LDFLAGS} | grep 'xarch') > /dev/null; then
    echo "    warning: -xarch flag detected"
    echo "    disabling shared C++ libraries"
    H5_CXX_SHARED="no"
  fi

dnl Try to detect the +DD64 flag for HPUX aCC compiler and disable C++ shared libraries if it's
dnl being used.

  if (echo dummy ${CXX} ${CXXLD} ${CFLAGS} ${CXXFLAGS} ${LDFLAGS} | grep 'DD64') > /dev/null; then
    echo "    warning: +DD64 flag detected"
    echo "    disabling shared C++ libraries"
    H5_CXX_SHARED="no"
  fi

  if test "X${enable_static}" = "Xno" && test "X${H5_CXX_SHARED}" = "Xno"; then
    AC_MSG_ERROR([both static and shared C++ libraries are disabled])
  fi
fi

AM_CONDITIONAL([CXX_SHARED_CONDITIONAL], [test "X$H5_CXX_SHARED" = "Xyes"])

dnl ----------------------------------------------------------------------
dnl pgcc version 6.0x have optimization (-O, -O2 or -O3) problem.  Detect
dnl these versions and add option "-Mx,28,0x8" to the compiler to avoid
dnl the problem if optimization is enabled.
dnl
if (${CC-cc} -V 2>&1 | grep '^pgcc 6.0') > /dev/null && test "X$enable_production" = "Xyes"; then
    echo 'adding compiler flag to avoid optimization problem in pgcc'
    CC="${CC-cc} -Mx,28,0x8"
fi

dnl ----------------------------------------------------------------------
dnl Shared libraries are not currently supported under Cygwin.
case "`uname`" in
  CYGWIN*)
    if test "X${enable_shared}" = "Xyes"; then
      echo '    warning: shared libraries are not supported on Cygwin!'
      echo '    disabling shared libraries'
    fi
    enable_shared="no"
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Create libtool.  If shared/static libraries are going to be enabled
dnl or disabled, it should happen before these macros.
AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL

dnl Post processing to patch up some deficiencies in libtool (as of
dnl Libtool 1.5.14)
case $host_os in
  linux* | freebsd* )
    # If gcc is not used, need to set $wl to use "-Wl,"
    if $CC -v 2>&1 | grep '^gcc' > /dev/null ; then
      : using gcc
    else
      echo 'fixing $wl in' $ofile
ed - $ofile <<EOF 2> /dev/null
/^wl=""/s//wl="-Wl,"/
w
q
EOF
    fi
    ;;
esac

dnl Fix up the INSTALL macro if it's a relative path. We want the
dnl full-path to the binary instead.
case "$INSTALL" in
  *install-sh*)
    INSTALL='\${top_srcdir}/bin/install-sh -c'
    ;;
esac

AC_MSG_CHECKING([make])

dnl ----------------------------------------------------------------------
dnl Sometimes makes think the `.PATH:' appearing before the first rule
dnl with an action should override the `all' default target. So we have
dnl to decide what the proper syntax is.
dnl
AC_MSG_CHECKING([how make searches directories])
while true; do #for break
  # The most common method is `VPATH=DIR1 DIR2 ...'
  cat >maketest <<EOF
VPATH=$srcdir/config $srcdir/src $srcdir/bin
.c.o:
	cp $< H5.o

foo: H5.o
	rm -f H5.o
	@echo works
EOF

  if (${MAKE-make} -f maketest foo) >/dev/null 2>&1; then
    SEARCH_RULE='VPATH='
    SEARCH_SEP=' '
    AC_MSG_RESULT([VPATH=DIR1 DIR2 ...])
    break
  fi

  dnl The second most common method is like above except with the
  dnl directories separated by colons.
  cat >maketest <<EOF
VPATH=$srcdir/config:$srcdir/src:$srcdir/bin
.c.o:
	cp $< H5.o

foo: H5.o
	rm -f H5.o
	@echo works
EOF

  if (${MAKE-make} -f maketest foo) >/dev/null 2>&1; then
    SEARCH_RULE='VPATH='
    SEARCH_SEP=':'
    AC_MSG_RESULT([VPATH=DIR1:DIR2:...])
    break
  fi

  dnl pmake uses the construct `.PATH: DIR1 DIR2
  cat >maketest <<EOF
.PATH: $srcdir/config $srcdir/src $srcdir/bin
.c.o:
	cp $< H5.o

foo: H5.o
	rm -f H5.o
	@echo works
EOF

  if (MAKE= ${MAKE-make} -f maketest foo) >/dev/null 2>&1; then
    SEARCH_RULE='.PATH: '
    SEARCH_SEP=' '
    AC_MSG_RESULT([.PATH: DIR1 DIR2 ...])
    break
  fi

  dnl No way for make to search directories
  SEARCH_RULE='## SEARCH DISABLED: '
  SEARCH_SEP=' '
  AC_MSG_RESULT([it doesn't])
  if test ! -f configure; then
    AC_MSG_ERROR([${MAKE-make} requires the build and source directories to be the same])
  fi
  break
done
rm maketest

dnl ----------------------------------------------------------------------
dnl pmake will throw an error if variables are undefined in a Makefile.
dnl These errors can be changed to warnings using the -V flag.
dnl
AC_SUBST(AM_MAKEFLAGS) AM_MAKEFLAGS=""

dnl Don't run test if MAKE is defined but is the empty string
if test -n "${MAKE-make}"; then 

  AC_MSG_CHECKING([whether make will build with undefined variables])

  cat >maketest <<EOF
foo: \$(UNDEFINED) \$(UNDEFINED2)
	@echo \$(UNDEFINED3) works
EOF

  if (${MAKE-make} -f maketest foo) >/dev/null 2>&1; then
    AC_MSG_RESULT([yes])
  else
    AC_MSG_RESULT([no, setting -V flag])
    AM_MAKEFLAGS="\-V"
  fi

  rm maketest
fi

dnl ----------------------------------------------------------------------
dnl Production flags?  Save the value in $CONFIG_MODE so we have it for
dnl the record.
dnl
AC_MSG_CHECKING(for production mode)
AC_ARG_ENABLE(production,
              [AC_HELP_STRING([--enable-production],
                              [Determines how to run the compiler.])])

case "X-$enable_production" in
  X-yes)
    enable_production="yes"
    AC_MSG_RESULT([production])

    dnl Remove the "-g" flag from CFLAGS if it's in there.
    dnl
    CFLAGS_temp=""
    if test -n "$CFLAGS"; then
      for d in $CFLAGS ; do
        if test "X$d" != "X-g"; then
          CFLAGS_temp="$CFLAGS_temp $d"
        fi
      done
      CFLAGS=$CFLAGS_temp
    fi

    CXXFLAGS_temp=""
    if test -n "$CXXFLAGS"; then
      for d in $CXXFLAGS ; do
        if test "X$d" != "X-g"; then
          CXXFLAGS_temp="$CXXFLAGS_temp $d"
        fi
      done
      CXXFLAGS=$CXXFLAGS_temp
    fi

    FCFLAGS_temp=""
    if test -n "$FCFLAGS"; then
      for d in $FCFLAGS ; do
        if test "X$d" != "X-g"; then
          FCFLAGS_temp="$FCFLAGS_temp $d"
        fi
      done
      FCFLAGS=$FCFLAGS_temp
    fi

    CONFIG_MODE=production
    H5_CFLAGS="$H5_CFLAGS $PROD_CFLAGS"
    H5_CPPFLAGS="$H5_CPPFLAGS $PROD_CPPFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $PROD_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $PROD_FCFLAGS"
    ;;
  X-|X-no)
    enable_production="no"
    AC_MSG_RESULT([development])
    CONFIG_MODE=development
    H5_CFLAGS="$H5_CFLAGS $DEBUG_CFLAGS"
    H5_CPPFLAGS="$H5_CPPFLAGS $DEBUG_CPPFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $DEBUG_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $DEBUG_FCFLAGS"
    ;;
  X-pg|X-profile)
    enable_production="profile"
    AC_MSG_RESULT([profile])
    CONFIG_MODE=profile
    H5_CFLAGS="$H5_CFLAGS $PROFILE_CFLAGS"
    H5_CPPFLAGS="$H5_CPPFLAGS $PROFILE_CPPFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $PROFILE_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $PROFILE_FCFLAGS"
    ;;
  *)
    enable_production="user-defined"
    AC_MSG_RESULT([user-defined])
    CONFIG_MODE="$X-enableval"
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Check for system libraries.
dnl
AC_CHECK_LIB([m], [ceil])

if test "`uname`" = "SunOS" -o "`uname -sr`" = "HP-UX B.11.00"; then
  dnl ...for Solaris
  AC_CHECK_LIB([socket], [socket])
  AC_CHECK_LIB([nsl], [xdr_int])
fi

dnl AC_CHECK_LIB([coug], [main])		dnl ...for ASCI/Red

dnl ----------------------------------------------------------------------
dnl Check for system header files.
dnl
AC_HEADER_STDC
AC_HEADER_TIME

dnl ----------------------------------------------------------------------
dnl Check for these two functions before <sys/time.h> is checked for, otherwise
dnl they are not detected correctly on Solaris [2.6].
dnl
AC_CHECK_FUNCS(difftime)
AC_CHECK_FUNCS(gettimeofday, [have_gettime="yes"], [have_gettime="no"])

dnl Unix
AC_CHECK_HEADERS([sys/resource.h sys/time.h unistd.h sys/ioctl.h sys/stat.h])
AC_CHECK_HEADERS([sys/socket.h sys/types.h])
AC_CHECK_HEADERS([stddef.h setjmp.h features.h])
AC_CHECK_HEADERS([stdint.h], [C9x=yes])

dnl Windows
case "`uname`" in
  CYGWIN*)
    AC_CHECK_HEADERS([io.h sys/timeb.h])
    ;;
  *)
    AC_CHECK_HEADERS([io.h winsock.h sys/timeb.h])
    ;;
esac

case "$host" in
  alpha*-dec*-osf*)
    dnl The <sys/sysinfo.h> and <sys/proc.h> are needed on the DEC
    dnl Alpha to turn off UAC fixing. We do *not* attempt to
    dnl locate these files on other systems because there are too
    dnl many problems with including them.
    AC_CHECK_HEADERS([sys/sysinfo.h sys/proc.h])
    ;;
  mips*-sgi*-irix*)
    dnl The <sys/fpu.h> is needed on the SGI machines to turn off
    dnl denormalized floating-point values going to zero.  We do *not*
    dnl attempt to dnl locate these files on other systems because there
    dnl may be problems with including them.
    AC_CHECK_HEADERS([sys/fpu.h])
    AC_CHECK_FUNCS([get_fpc_csr])
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Test for 64bit stuff before the data types and their sizes. The
dnl result could effect the outcome of the sizeof macros below.
dnl
case "$host_cpu-$host_vendor-$host_os" in
  *linux*)
    dnl ----------------------------------------------------------------------
    dnl Enable large file support on linux? Store the result in the LINUX_LFS
    dnl variable for posterity
    AC_ARG_ENABLE([linux-lfs],
                  [AC_HELP_STRING([--enable-linux-lfs],
                                  [Enable support for large (64-bit)
                                   files on Linux. [default=check]])])

    LINUX_LFS="no"
    case "X-$enable_linux_lfs" in
      X-yes)
        LINUX_LFS=yes
        ;;
      X-no)
        ;;
      X-|*)
        MAJOR_VER="`uname -r | cut -d '.' -f1`"
        MINOR_VER="`uname -r | cut -d '.' -f2`"

        if test ${MAJOR_VER} -gt 2 -o ${MAJOR_VER} -eq 2 -a ${MINOR_VER} -ge 4; then
          LINUX_LFS="yes"
        fi
        ;;
    esac

    AC_MSG_CHECKING([for large file support mode on Linux])
    if test "X$LINUX_LFS" = "Xyes"; then
      AC_MSG_RESULT([enabled])
      CPPFLAGS="-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE $CPPFLAGS"
    else
      AC_MSG_RESULT([disabled])
    fi

    dnl Add POSIX support on Linux systems, so <features.h> defines
    dnl __USE_POSIX, which is required to get the prototype for fdopen
    dnl defined correctly in <stdio.h>
    CPPFLAGS="-D_POSIX_SOURCE $CPPFLAGS"

    dnl Also add BSD support on Linux systems, so <features.h> defines
    dnl __USE_BSD, which is required to get the prototype for strdup
    dnl defined correctly in <string.h> and snprintf & vsnprintf defined
    dnl correctly in <stdio.h>
    CPPFLAGS="-D_BSD_SOURCE $CPPFLAGS"
    ;;
esac

AC_TRY_COMPILE([#include <sys/types.h>],
               [off64_t n = 0;],
               [AC_CHECK_FUNCS([lseek64 fseek64 fseeko ftello])],
               [AC_MSG_RESULT([skipping test for lseek64(), fseek64(), fseeko(), and ftello])])
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/stat.h>],
[struct stat64 sb;],
[AC_CHECK_FUNCS([stat64 fstat64])],
[AC_MSG_RESULT([skipping test for stat64() and fstat64()])])

dnl ----------------------------------------------------------------------
dnl Data types and their sizes.
dnl
AC_TYPE_OFF_T
AC_CHECK_TYPE([size_t], [unsigned long])
AC_CHECK_TYPE([ssize_t], [long])
AC_C_BIGENDIAN
AC_CHECK_SIZEOF([char], [1])
AC_CHECK_SIZEOF([short], [2])
AC_CHECK_SIZEOF([int], [4])
AC_CHECK_SIZEOF([long], [4])
AC_CHECK_SIZEOF([long long], [8])
AC_CHECK_SIZEOF([__int64], [8])
AC_CHECK_SIZEOF([float], [4])
AC_CHECK_SIZEOF([double], [8])
AC_CHECK_SIZEOF([long double], [8])

dnl Checkpoint the cache
AC_CACHE_SAVE

dnl Posix.1g types (C9x)
cat >>confdefs.h <<\EOF
#include <sys/types.h>
EOF

if test "X$C9x" = "Xyes"; then
  cat >>confdefs.h <<\EOF
#include <stdint.h>
EOF
fi

AC_CHECK_SIZEOF(        int8_t, [1])
AC_CHECK_SIZEOF(       uint8_t, [1])
AC_CHECK_SIZEOF(  int_least8_t, [1])
AC_CHECK_SIZEOF( uint_least8_t, [1])
AC_CHECK_SIZEOF(   int_fast8_t, [1])
AC_CHECK_SIZEOF(  uint_fast8_t, [1])

AC_CHECK_SIZEOF(       int16_t, [2])
AC_CHECK_SIZEOF(      uint16_t, [2])
AC_CHECK_SIZEOF( int_least16_t, [2])
AC_CHECK_SIZEOF(uint_least16_t, [2])
AC_CHECK_SIZEOF(  int_fast16_t, [2])
AC_CHECK_SIZEOF( uint_fast16_t, [2])

AC_CHECK_SIZEOF(       int32_t, [4])
AC_CHECK_SIZEOF(      uint32_t, [4])
AC_CHECK_SIZEOF( int_least32_t, [4])
AC_CHECK_SIZEOF(uint_least32_t, [4])
AC_CHECK_SIZEOF(  int_fast32_t, [4])
AC_CHECK_SIZEOF( uint_fast32_t, [4])

AC_CHECK_SIZEOF(       int64_t, [8])
AC_CHECK_SIZEOF(      uint64_t, [8])
AC_CHECK_SIZEOF( int_least64_t, [8])
AC_CHECK_SIZEOF(uint_least64_t, [8])
AC_CHECK_SIZEOF(  int_fast64_t, [8])
AC_CHECK_SIZEOF( uint_fast64_t, [8])

AC_CHECK_SIZEOF([size_t], [4])
AC_CHECK_SIZEOF([ssize_t], [4])

cat >>confdefs.h <<\EOF
#include <sys/types.h> /*for off_t definition*/
EOF
AC_CHECK_SIZEOF([off_t], [4])
AC_CHECK_SIZEOF([off64_t], [8])

dnl Checkpoint the cache
AC_CACHE_SAVE

dnl ----------------------------------------------------------------------
dnl Check if the dev_t type is a scalar type (must come after the check for
dnl sys/types.h)
AC_MSG_CHECKING([if dev_t is scalar])
AC_TRY_COMPILE([
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
  ],
  [dev_t d1, d2; if(d1==d2) return 0;],
  AC_DEFINE([DEV_T_IS_SCALAR], [1],
            [Define if `dev_t' is a scalar])
  AC_MSG_RESULT(yes),
  AC_MSG_RESULT(no)
)

dnl ----------------------------------------------------------------------
dnl Fake --with-xxx option to allow us to create a help message for the
dnl following --with-xxx options which can take either a =DIR or =INC,LIB
dnl specifier.
dnl
AC_ARG_WITH([fnord],
  [
 For the following --with-xxx options, you can specify where the header
 files and libraries are in two different ways:

    --with-xxx=INC,LIB - Specify individually the include directory and
                         library directory separated by a comma
    --with-xxx=DIR     - Specify only the directory which contains the
                         include/ and lib/ subdirectories
  ])

dnl ----------------------------------------------------------------------
dnl Is the dmalloc present? It has a header file `dmalloc.h' and a library
dnl `-ldmalloc' and their locations might be specified with the `--with-dmalloc'
dnl command-line switch. The value is an include path and/or a library path.
dnl If the library path is specified then it must be preceded by a comma.
dnl
AC_ARG_WITH([dmalloc],
            [AC_HELP_STRING([--with-dmalloc=DIR],
                            [Use dmalloc memory debugging aid [default=no]])],,
            withval=no)

case $withval in
  yes)
    HAVE_DMALLOC="yes"
    AC_CHECK_HEADERS(dmalloc.h)
    AC_CHECK_LIB(dmalloc, dmalloc_shutdown,, unset HAVE_DMALLOC)

    if test -z "$HAVE_DMALLOC" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR(couldn't find dmalloc library)
    fi
    ;;
  no)
    HAVE_DMALLOC="no"
    AC_MSG_CHECKING(for dmalloc library)
    AC_MSG_RESULT(suppressed)
    ;;
  *)
    HAVE_DMALLOC="yes"
    case "$withval" in
      *,*)
        dmalloc_inc="`echo $withval |cut -f1 -d,`"
        dmalloc_lib="`echo $withval |cut -f2 -d, -s`"
        ;;
      *)
        if test -n "$withval"; then
          dmalloc_inc="$withval/include"
          dmalloc_lib="$withval/lib"
        fi
        ;;
    esac

    dnl Trying to include -I/usr/include and -L/usr/lib is redundant and
    dnl can mess some compilers up.
    if test "X$dmalloc_inc" = "X/usr/include"; then
      dmalloc_inc=""
    fi
    if test "X$dmalloc_lib" = "X/usr/lib"; then
      dmalloc_lib=""
    fi

    saved_CPPFLAGS="$CPPFLAGS"
    saved_LDFLAGS="$LDFLAGS"

    if test -n "$dmalloc_inc"; then
      CPPFLAGS="$CPPFLAGS -I$dmalloc_inc"
    fi

    AC_CHECK_HEADERS(dmalloc.h,, CPPFLAGS="$saved_CPPFLAGS")

    if test -n "$dmalloc_lib"; then
      LDFLAGS="$LDFLAGS -L$dmalloc_lib"
    fi

    AC_CHECK_LIB(dmalloc, dmalloc_shutdown,, LDFLAGS="$saved_LDFLAGS"; unset HAVE_DMALLOC)

    if test -z "$HAVE_DMALLOC" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR(couldn't find dmalloc library)
    fi
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Is the GNU zlib present? It has a header file `zlib.h' and a library
dnl `-lz' and their locations might be specified with the `--with-zlib'
dnl command-line switch. The value is an include path and/or a library path.
dnl If the library path is specified then it must be preceded by a comma.
dnl
AC_SUBST(USE_FILTER_DEFLATE) USE_FILTER_DEFLATE="no"
AC_ARG_WITH([zlib],
            [AC_HELP_STRING([--with-zlib=DIR],
                            [Use zlib library for external deflate I/O
                             filter [default=yes]])],,
            withval=yes)

case $withval in
  yes)
    HAVE_ZLIB="yes"
    AC_CHECK_HEADERS([zlib.h], [HAVE_ZLIB_H="yes"])
    AC_CHECK_LIB([z], [compress2],, [unset HAVE_ZLIB])
    AC_CHECK_FUNC([compress2], [HAVE_COMPRESS2="yes"])

    if test -z "$HAVE_ZLIB" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR([couldn't find zlib library])
    fi
    ;;
  no)
    HAVE_ZLIB="no"
    AC_MSG_CHECKING([for GNU zlib])
    AC_MSG_RESULT([suppressed])
    ;;
  *)
    HAVE_ZLIB="yes"
    case "$withval" in
      *,*)
        zlib_inc="`echo $withval |cut -f1 -d,`"
        zlib_lib="`echo $withval |cut -f2 -d, -s`"
        ;;
      *)
        if test -n "$withval"; then
          zlib_inc="$withval/include"
          zlib_lib="$withval/lib"
        fi
        ;;
    esac

    dnl Trying to include -I/usr/include and -L/usr/lib is redundant and
    dnl can mess some compilers up.
    if test "X$zlib_inc" = "X/usr/include"; then
      zlib_inc=""
    fi
    if test "X$zlib_lib" = "X/usr/lib"; then
      zlib_lib=""
    fi

    saved_CPPFLAGS="$CPPFLAGS"
    saved_LDFLAGS="$LDFLAGS"

    if test -n "$zlib_inc"; then
      CPPFLAGS="$CPPFLAGS -I$zlib_inc"
    fi

    AC_CHECK_HEADERS([zlib.h],
                     [HAVE_ZLIB_H="yes"],
                     [CPPFLAGS="$saved_CPPFLAGS"])

    if test -n "$zlib_lib"; then
      LDFLAGS="$LDFLAGS -L$zlib_lib"
    fi

    AC_CHECK_LIB([z], [compress2],,
                 [LDFLAGS="$saved_LDFLAGS"; unset HAVE_ZLIB])
    AC_CHECK_FUNC([compress2], [HAVE_COMPRESS2="yes"])

    if test -z "$HAVE_ZLIB" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR([couldn't find zlib library])
    fi
    ;;
esac

if test "x$HAVE_ZLIB" = "xyes" -a "x$HAVE_ZLIB_H" = "xyes" -a "x$HAVE_COMPRESS2" = "xyes"; then
    AC_DEFINE([HAVE_FILTER_DEFLATE], [1], [Define if support for deflate (zlib) filter is enabled])
    USE_FILTER_DEFLATE="yes"

    dnl Add "deflate" to external filter list
    if test "X$EXTERNAL_FILTERS" != "X"; then
        EXTERNAL_FILTERS="${EXTERNAL_FILTERS},"
    fi
    EXTERNAL_FILTERS="${EXTERNAL_FILTERS}deflate(zlib)"
fi


dnl ----------------------------------------------------------------------
dnl Is the szlib present? It has a header file `szlib.h' and a library
dnl `-lsz' and their locations might be specified with the `--with-szlib'
dnl command-line switch. The value is an include path and/or a library path.
dnl If the library path is specified then it must be preceded by a comma.
dnl
AC_SUBST(USE_FILTER_SZIP) USE_FILTER_SZIP="no"
AC_ARG_WITH([szlib],
            [AC_HELP_STRING([--with-szlib=DIR],
                            [Use szlib library for external szlib I/O
                             filter [default=no]])],,
            withval=no)

case $withval in
  yes)
    HAVE_SZLIB="yes"
    AC_CHECK_HEADERS([szlib.h], [HAVE_SZLIB_H="yes"])
    AC_CHECK_LIB([sz], [SZ_BufftoBuffCompress],, [unset HAVE_SZLIB])

    if test -z "$HAVE_SZLIB" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR([couldn't find szlib library])
    fi
    ;;
  no)
    HAVE_SZLIB="no"
    AC_MSG_CHECKING([for szlib])
    AC_MSG_RESULT([suppressed])
    ;;
  *)
    HAVE_SZLIB="yes"
    case "$withval" in
      *,*)
        szlib_inc="`echo $withval |cut -f1 -d,`"
        szlib_lib="`echo $withval |cut -f2 -d, -s`"
        ;;
      *)
        if test -n "$withval"; then
          szlib_inc="$withval/include"
          szlib_lib="$withval/lib"
        fi
        ;;
    esac
    
    dnl Trying to include -I/usr/include and -L/usr/lib is redundant and
    dnl can mess some compilers up.
    if test "X$szlib_inc" = "X/usr/include"; then
      szlib_inc=""
    fi 
    if test "X$szlib_lib" = "X/usr/lib"; then
      szlib_lib=""
    fi
    
    saved_CPPFLAGS="$CPPFLAGS"
    saved_LDFLAGS="$LDFLAGS"
    
    if test -n "$szlib_inc"; then
      CPPFLAGS="$CPPFLAGS -I$szlib_inc"
    fi
    
    AC_CHECK_HEADERS([szlib.h],
                     [HAVE_SZLIB_H="yes"],
                     [CPPFLAGS="$saved_CPPFLAGS"])
    
    if test -n "$szlib_lib"; then
      LDFLAGS="$LDFLAGS -L$szlib_lib"
    fi
    
    AC_CHECK_LIB([sz], [SZ_BufftoBuffCompress],,
                 [LDFLAGS="$saved_LDFLAGS"; unset HAVE_SZLIB])
    
    if test -z "$HAVE_SZLIB" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR([couldn't find szlib library])
    fi
    ;;
esac

if test "x$HAVE_SZLIB" = "xyes" -a "x$HAVE_SZLIB_H" = "xyes"; then
    dnl SZLIB library is available.  Check if it can encode
    AC_MSG_CHECKING([for szlib encoder])
    
    AC_CACHE_VAL([hdf5_cv_szlib_functional],
        [AC_TRY_RUN([
        #include <szlib.h>
        
        int main(void)
        {   
            SZ_encoder_enabled();
            exit(0);
        }
        ], [hdf5_cv_szlib_functional=yes], [hdf5_cv_szlib_functional=no],)])
    
    AC_CACHE_VAL([hdf5_cv_szlib_can_encode],
        [AC_TRY_RUN([
        #include <szlib.h>
        
        int main(void)
        {       
                /* SZ_encoder_enabled returns 1 if encoder is present */
            if(SZ_encoder_enabled() == 1)
                exit(0);
            else
                exit(1);
        }
        ], [hdf5_cv_szlib_can_encode=yes], [hdf5_cv_szlib_can_encode=no],)])
    
    if test ${hdf5_cv_szlib_functional} = "no"; then
        hdf5_cv_szlib_can_encode=broken
    else
        AC_DEFINE(HAVE_FILTER_SZIP, 1, 
                [Define if support for szip filter is enabled])
        USE_FILTER_SZIP="yes"
    fi
    
    if test ${hdf5_cv_szlib_can_encode} = "yes"; then
        AC_MSG_RESULT([yes])
    fi 
    if test ${hdf5_cv_szlib_can_encode} = "no"; then
        AC_MSG_RESULT([no])
    fi 
    if test ${hdf5_cv_szlib_can_encode} = "broken"; then
        AC_MSG_RESULT([shared szlib doesn't work. disabling szip.])
    fi
    
    dnl Add "szip" to external filter list
    if test ${hdf5_cv_szlib_can_encode} = "yes"; then
        if test "X$EXTERNAL_FILTERS" != "X"; then
            EXTERNAL_FILTERS="${EXTERNAL_FILTERS},"
        fi
        EXTERNAL_FILTERS="${EXTERNAL_FILTERS}szip(encoder)"
    fi 
    if test ${hdf5_cv_szlib_can_encode} = "no"; then
        if test "X$EXTERNAL_FILTERS" != "X"; then
            EXTERNAL_FILTERS="${EXTERNAL_FILTERS},"
        fi
        EXTERNAL_FILTERS="${EXTERNAL_FILTERS}szip(no encoder)"
    fi

fi

dnl Checkpoint the cache
AC_CACHE_SAVE

dnl ----------------------------------------------------------------------
dnl Is the Pthreads library present?  It has a header file `pthread.h' and
dnl a library `-lpthread' and their locations might be specified with the
dnl `--with-pthread' command-line switch.  The value is an include path
dnl and/or a library path.  If the library path is specified then it must
dnl be preceded by a comma.
dnl
AC_SUBST([PTHREAD]) PTHREAD=yes
AC_ARG_WITH([pthread],
            [AC_HELP_STRING([--with-pthread=DIR],
                            [Use the Pthreads library [default=no]])],,
            withval=no)

case "$withval" in
  yes)
    AC_CHECK_HEADERS([pthread.h])
    AC_CHECK_LIB([pthread], [pthread_create],, [unset PTHREAD])
    ;;
  no)
    AC_MSG_CHECKING([for pthread])
    AC_MSG_RESULT([suppressed])
    unset PTHREAD
    ;;
  *)
    case "$withval" in
      *,*)
        pthread_inc="`echo $withval | cut -f1 -d,`"
        pthread_lib="`echo $withval | cut -f2 -d, -s`"
        ;;
      *)
        if test -n "$withval"; then
          pthread_inc="$withval/include"
          pthread_lib="$withval/lib"
        fi
        ;;
    esac

    dnl Trying to include -I/usr/include and -L/usr/lib is redundant and
    dnl can mess some compilers up.
    if test "X$pthread_inc" = "X/usr/include"; then
      pthread_inc=""
    fi
    if test "X$pthread_lib" = "X/usr/lib"; then
      pthread_lib=""
    fi

    if test -n "$pthread_inc"; then
      saved_CPPFLAGS="$CPPFLAGS"
      CPPFLAGS="$CPPFLAGS -I$pthread_inc"
      AC_CHECK_HEADERS([pthread.h],, [CPPFLAGS="$saved_CPPFLAGS"; unset PTHREAD])
    else
      AC_CHECK_HEADERS([pthread.h],, [unset PTHREAD])
    fi

    if test -n "$pthread_lib"; then
      saved_LDFLAGS="$LDFLAGS"
      LDFLAGS="$LDFLAGS -L$pthread_lib"
      AC_CHECK_LIB([pthread], [pthread_create],,
                   [LDFLAGS="$saved_LDFLAGS"; unset PTHREAD])
    else
      AC_CHECK_LIB([pthread], [pthread_create],, [unset PTHREAD])
    fi
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Enable thread-safe version of library.  It requires Pthreads support.
dnl
AC_MSG_CHECKING([for thread safe support])
AC_ARG_ENABLE([threadsafe],
              [AC_HELP_STRING([--enable-threadsafe],
                              [Enable thread safe capability])],
              THREADSAFE=$enableval)

case "X-$THREADSAFE" in
  X-|X-no)
    AC_MSG_RESULT([no])
    ;;
  X-yes)
    dnl Check that we can link a simple Pthread program.
    AC_TRY_LINK(, [pthread_create()],
                [AC_MSG_RESULT([yes]); THREADSAFE=yes],
                [AC_MSG_ERROR([needed pthread library not available])])
    ;;
  *)
    AC_MSG_RESULT([error])
    AC_MSG_ERROR([\'$enableval\' is not a valid threadsafe type])
    ;;
esac

if test "X$THREADSAFE" = "Xyes"; then
  AC_DEFINE([HAVE_THREADSAFE], [1], [Define if we have thread safe support])
fi

dnl ----------------------------------------------------------------------
dnl Check if they would like the HDF5 v1.6 compatibility functions
dnl compiled in
dnl
AC_MSG_CHECKING([whether HDF5 v1.6 compatibility functions enabled])
AC_ARG_ENABLE([hdf5v1_6],
              [AC_HELP_STRING([--enable-hdf5v1_6],
                              [Compile the HDF5 v1.6 compatibility
                               interface [default=no]])],
              [HDF5_V1_6_COMPAT=$enableval])

if test "$HDF5_V1_6_COMPAT" = "yes"; then
  AC_MSG_RESULT([yes])
  AC_DEFINE([WANT_H5_V1_6_COMPAT], [1],
            [Define if the HDF5 v1.6 compatibility functions are to be compiled in])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl How does one figure out the local time zone?  Anyone know of a
dnl Posix way to do this?
dnl

dnl First check if `struct tm' has a `tm_gmtoff' member.
AC_MSG_CHECKING([for tm_gmtoff in struct tm])
AC_TRY_COMPILE([
#include <sys/time.h>
#include <time.h>], [struct tm tm; tm.tm_gmtoff=0;],
AC_DEFINE([HAVE_TM_GMTOFF], [1],
          [Define if `tm_gmtoff' is a member of `struct tm'])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

dnl check if `struct tm' has a `__tm_gmtoff' member.
AC_MSG_CHECKING([for __tm_gmtoff in struct tm])
AC_TRY_COMPILE([
#include <sys/time.h>
#include <time.h>], [struct tm tm; tm.__tm_gmtoff=0;],
AC_DEFINE([HAVE___TM_GMTOFF], [1],
          [Define if `__tm_gmtoff' is a member of `struct tm'])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

dnl Check whether the global variable `timezone' is defined.
AC_MSG_CHECKING([for global timezone variable])
AC_TRY_LINK([
#include <sys/time.h>
#include <time.h>], [timezone=0;],
AC_DEFINE([HAVE_TIMEZONE], [1],
          [Define if `timezone' is a global variable])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

dnl Check whether `struct timezone' is defined.
AC_STRUCT_TIMEZONE
AC_MSG_CHECKING([for struct timezone])
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>], [struct timezone tz; tz.tz_minuteswest=0;],
AC_DEFINE([HAVE_STRUCT_TIMEZONE], [1],
          [Define if `struct timezone' is defined])
have_struct_tz="yes"
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

dnl If gettimeofday() is going to be used, make sure it uses the timezone struct

if test "$have_gettime" = "yes" -a "$have_struct_tz" = "yes"; then
   AC_MSG_CHECKING(whether gettimeofday() gives timezone)
   AC_CACHE_VAL([hdf5_cv_gettimeofday_tz],
       [AC_TRY_RUN([
          #include <time.h>
          #include <sys/time.h>
          int main(void)
          {
             struct timeval tv;
             struct timezone tz;
             tz.tz_minuteswest = 7777;  /* Initialize to an unreasonable number */
             tz.tz_dsttime = 7;
             gettimeofday(&tv, &tz);
                /* Check whether the function returned any value at all */
             if(tz.tz_minuteswest == 7777 && tz.tz_dsttime == 7)
                exit(1);
             else exit (0);
          }], [hdf5_cv_gettimeofday_tz=yes], [hdf5_cv_gettimeofday_tz=no],)])

   if test ${hdf5_cv_gettimeofday_tz} = "yes"; then
      AC_MSG_RESULT([yes])
      AC_DEFINE([GETTIMEOFDAY_GIVES_TZ], [1],
                [Define if gettimeofday() populates the tz pointer passed in])
   else
      AC_MSG_RESULT([no])
   fi
fi 

dnl ----------------------------------------------------------------------
dnl Does the struct stat have the st_blocks field?  This field is not Posix.
dnl
AC_MSG_CHECKING([for st_blocks in struct stat])
AC_TRY_COMPILE([
#include <sys/stat.h>],[struct stat sb; sb.st_blocks=0;],
AC_DEFINE([HAVE_STAT_ST_BLOCKS], [1],
          [Define if `struct stat' has the `st_blocks' field])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

dnl ----------------------------------------------------------------------
dnl How do we figure out the width of a tty in characters?
dnl
AC_CHECK_FUNCS(_getvideoconfig gettextinfo GetConsoleScreenBufferInfo)
AC_CHECK_FUNCS(_scrsize ioctl)

AC_MSG_CHECKING([for struct videoconfig])
AC_TRY_COMPILE(,[struct videoconfig w; w.numtextcols=0;],
AC_DEFINE([HAVE_STRUCT_VIDEOCONFIG], [1],
          [Define if `struct videoconfig' is defined])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

AC_MSG_CHECKING([for struct text_info])
AC_TRY_COMPILE(, [struct text_info w; w.screenwidth=0;],
AC_DEFINE([HAVE_STRUCT_TEXT_INFO], [1],
          [Define if `struct text_info' is defined])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

AC_MSG_CHECKING([for TIOCGWINSZ])
AC_TRY_COMPILE([#include <sys/ioctl.h>],[int w=TIOCGWINSZ;],
AC_DEFINE([HAVE_TIOCGWINSZ], [1],
          [Define if the ioctl TIOGWINSZ is defined])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))

AC_MSG_CHECKING([for TIOCGETD])
AC_TRY_COMPILE([#include <sys/ioctl.h>],[int w=TIOCGETD;],
AC_DEFINE([HAVE_TIOCGETD], [1],
          [Define if the ioctl TIOCGETD is defined])
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))


dnl ----------------------------------------------------------------------
dnl Check for functions.
dnl tmpfile needed by h5pdiff.
dnl
AC_CHECK_FUNCS(alarm fork frexpf frexpl gethostname getpwuid getrusage)
AC_CHECK_FUNCS(BSDgettimeofday longjmp setsysinfo sigaction)
AC_CHECK_FUNCS(signal snprintf vasprintf strdup system waitpid)
AC_CHECK_FUNCS(rand_r random srandom)
AC_CHECK_FUNCS(tmpfile)

dnl Check for vsnprintf() separately, so we can detect situations where it
dnl doesn't return the correct size for formatted strings that are too large
dnl for the buffer provided
AC_CHECK_FUNCS(vsnprintf,

    dnl Check if vsnprintf() returns correct size for strings that don't fit
    dnl into the size allowed.  If vsnprintf() works correctly on this platform,
    dnl it should return a value of 42 for the test below
    dnl
    dnl Note that vsnprintf fails in two different ways:
    dnl         - In IRIX64, calls to vnsprintf() with a formatted string that
    dnl                 is larger than the buffer size allowed incorrectly
    dnl                 return the size of the buffer minus one.
    dnl         - In HP/UX, calls to vsnprintf() with a formatted string that
    dnl                 is larger than the buffer size allowed incorrectly
    dnl                 return (-1)
    AC_MSG_CHECKING([if vsnprintf returns correct value])

    AC_CACHE_VAL([hdf5_cv_vsnprintf_works],
        AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

int test_vsnprintf(const char *fmt,...)
{
    va_list     ap;
    char *s = malloc(16);
    int ret;

    va_start(ap, fmt);
    ret=vsnprintf(s,16,"%s",ap);
    va_end(ap);

    return(ret!=42 ? 1 : 0);
}

int main(void)
{
    exit(test_vsnprintf("%s","A string that is longer than 16 characters"));
}
   ],[hdf5_cv_vsnprintf_works=yes],[hdf5_cv_vsnprintf_works=no],))

       if test ${hdf5_cv_vsnprintf_works} = "yes"; then
          AC_MSG_RESULT([yes])
          AC_DEFINE([VSNPRINTF_WORKS], [1],
                    [Define if vsnprintf() returns the correct value for formatted strings that don't fit into size allowed])
       else
          AC_MSG_RESULT([no])
       fi
    ,)

dnl ----------------------------------------------------------------------
dnl Check that a lone colon can be used as an argument
dnl This is not true on Cray X1, which interprets a lone colon as a
dnl system command.
dnl
AC_CACHE_CHECK([if lone colon can be used as an argument],
               [hdf5_cv_lone_colon],
               [
  echo "int main(int argc, char * argv[]) {return 0;}" > conftest.c
  $CC $CFLAGS conftest.c > /dev/null 2> /dev/null
  echo "./a.out :" > conftest.sh
  chmod 700 conftest.sh

  ./conftest.sh 2> conftest.out
  rm a.out
  TEST_OUTPUT=`cat conftest.out`

  if test "X$TEST_OUTPUT" = "X"; then
    hdf5_cv_lone_colon=yes
  else
    hdf5_cv_lone_colon=no
  fi
               ])

AC_SUBST(H5_LONE_COLON) H5_LONE_COLON="$hdf5_cv_lone_colon"

dnl ----------------------------------------------------------------------
dnl Check compiler characteristics
dnl
AC_C_CONST
AC_C_INLINE

AC_MSG_CHECKING([for __attribute__ extension])
AC_TRY_COMPILE(,[int __attribute__((unused)) x],
               AC_DEFINE([HAVE_ATTRIBUTE], [1],
                         [Define if the __attribute__(()) extension is present])
               AC_MSG_RESULT([yes]),
               AC_MSG_RESULT([no]))

AC_MSG_CHECKING([for __FUNCTION__ extension])
AC_TRY_COMPILE(,[(void)__FUNCTION__],
               AC_DEFINE([HAVE_FUNCTION], [1],
                         [Define if the compiler understand the __FUNCTION__ keyword])
               AC_MSG_RESULT([yes]),
               AC_MSG_RESULT([no]))

dnl ----------------------------------------------------------------------
dnl Try to figure out how to print `long long'.  Some machines use `%lld'
dnl and others use `%qd'.  There may be more!  The final `l' is a
dnl default in case none of the others work.
dnl Need to patch up LD_LIBRARY_PATH so that the execution can find all
dnl the dynamic library.  The correct way to do it should be updating
dnl LD_LIBRARY_PATH along with LDFLAGS or do it with the AC_TRY_RUN macro.
dnl
AC_MSG_CHECKING([how to print long long])
AC_CACHE_VAL([hdf5_cv_printf_ll],
LD_LIBRARY_PATH="$LD_LIBRARY_PATH`echo $LDFLAGS | sed -e 's/-L/:/g' -e 's/ //g'`"
export LD_LIBRARY_PATH

for hdf5_cv_printf_ll in l ll L q unknown; do
   AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{
	char *s = malloc(128);
	long long x = (long long)1048576 * (long long)1048576;
	sprintf(s,"%${hdf5_cv_printf_ll}d",x);
	exit(strcmp(s,"1099511627776"));
}
   ], break,,continue)
done)dnl

AC_MSG_RESULT([%${hdf5_cv_printf_ll}d and %${hdf5_cv_printf_ll}u])
AC_DEFINE_UNQUOTED([PRINTF_LL_WIDTH], ["$hdf5_cv_printf_ll"], 
                   [Width for printf() for type `long long' or `__int64', use `ll'])

dnl ----------------------------------------------------------------------
dnl Check if pthread_attr_setscope(&attribute, PTHREAD_SCOPE_SYSTEM)
dnl is supported on this system
dnl
AC_MSG_CHECKING([Threads support system scope])
AC_CACHE_VAL([hdf5_cv_system_scope_threads],
[AC_TRY_RUN([
#if STDC_HEADERS
#include <stdlib.h>
#include <pthread.h>
#endif

int main(void)
{
    pthread_attr_t attribute;
    int ret;

    pthread_attr_init(&attribute);
    ret=pthread_attr_setscope(&attribute, PTHREAD_SCOPE_SYSTEM);
    exit(ret==0 ? 0 : 1);
}
], [hdf5_cv_system_scope_threads=yes], [hdf5_cv_system_scope_threads=no],)])

if test ${hdf5_cv_system_scope_threads} = "yes"; then
  AC_DEFINE([SYSTEM_SCOPE_THREADS], [1],
            [Define if your system supports pthread_attr_setscope(&attribute, PTHREAD_SCOPE_SYSTEM) call.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Checking to see if GPFS is available on this filesystem
dnl
AC_ARG_ENABLE([gpfs],
              [AC_HELP_STRING([--enable-gpfs],
                              [Enable GPFS hints for the MPI/POSIX file
                               driver. [default=no]])],,
              [enableval=no])

case "X-$enableval" in
  X-yes)
    AC_CHECK_HEADERS([gpfs.h],
                     AC_MSG_CHECKING([for GPFS support])
                     AC_TRY_COMPILE([#include <gpfs.h>],
                                    [int fd = 0; gpfs_fcntl(fd, (void *)0);],
                                    AC_DEFINE(HAVE_GPFS, 1,
                                              [Define if we have GPFS support])
                                    AC_MSG_RESULT([yes])
                                    LIBS="$LIBS -lgpfs"
                                    GPFS="yes",
                                    AC_MSG_RESULT([no])
                                    GPFS="no"))
    ;;
  X-no|*)
    AC_MSG_CHECKING([for gpfs])
    AC_MSG_RESULT([suppressed])
    ;;
esac
   
dnl ----------------------------------------------------------------------
dnl Turn on debugging by setting compiler flags
dnl This must come after the enable-production since it depends on production.
dnl
AC_MSG_CHECKING(for debug flags)
AC_ARG_ENABLE([debug],
              [AC_HELP_STRING([--enable-debug=all],
                              [Turn on debugging in all packages. One may
                               also specify a comma-separated list of
                               package names without the leading H5 or
                               the word no. The default is most
                               packages.])],
              [DEBUG_PKG=$enableval])

dnl Default to no if producton is enabled
if test "X-$DEBUG_PKG" = X- ; then
    if test "$enable_production" = yes ; then
	DEBUG_PKG=no
    else
	DEBUG_PKG=yes
    fi
fi

AC_SUBST([DEBUG_PKG])
all_packages="ac,b,b2,d,e,f,g,hg,hl,i,mf,mm,o,p,s,t,v,z"
case "X-$DEBUG_PKG" in
  X-yes)
    DEBUG_PKG="d,e,f,g,hg,i,mm,o,p,s,t,v,z"
    H5_CPPFLAGS="$H5_CPPFLAGS -UNDEBUG"
    AC_MSG_RESULT([default ($DEBUG_PKG)])
    ;;
  X-all)
    DEBUG_PKG=$all_packages
    H5_CPPFLAGS="$H5_CPPFLAGS -UNDEBUG"
    AC_MSG_RESULT([all ($DEBUG_PKG)])
    ;;
  X-no|X-none)
    AC_MSG_RESULT([none])
    DEBUG_PKG=
    H5_CPPFLAGS="$H5_CPPFLAGS -DNDEBUG"
    ;;
  *)
    AC_MSG_RESULT([$DEBUG_PKG])
    ;;
esac

if test -n "$DEBUG_PKG"; then
  for pkg in `echo $DEBUG_PKG | ${TR} ${as_cr_letters}"," ${as_cr_LETTERS}" "`; do
    H5_CPPFLAGS="$H5_CPPFLAGS -DH5${pkg}_DEBUG"
  done
fi

dnl ----------------------------------------------------------------------
dnl Check if they would like the function stack support compiled in
dnl
AC_MSG_CHECKING([whether function stack tracking is enabled])
AC_ARG_ENABLE([codestack],
              [AC_HELP_STRING([--enable-codestack],
                              [Enable the function stack tracing (for developer debugging).])],
              [CODESTACK=$enableval])

case "X-$CODESTACK" in
  X-yes)
      CODESTACK=yes
      AC_MSG_RESULT([yes])
      AC_DEFINE([HAVE_CODESTACK], [1],
                [Define if the function stack tracing code is to be compiled in])
    ;;
  *)
      CODESTACK=no
      AC_MSG_RESULT([no])
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Check if they would like the metadata trace file code compiled in
dnl
AC_MSG_CHECKING([whether metadata trace file code is enabled])
AC_ARG_ENABLE([metadata-trace-file],
              [AC_HELP_STRING([--enable-metadata-trace-file],
                              [Enable metadata trace file collection.])],
              [METADATATRACEFILE=$enableval])

case "X-$METADATATRACEFILE" in
  X-yes)
      METADATATRACEFILE=yes
      AC_MSG_RESULT([yes])
      AC_DEFINE([METADATA_TRACE_FILE], [1],
                [Define if the metadata trace file code is to be compiled in])
    ;;
  *)
      METADATATRACEFILE=no
      AC_MSG_RESULT([no])
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Enable tracing of the API
dnl This must come after the enable-debug since it depends on debug.
dnl
AC_SUBST([TRACE_API])
AC_MSG_CHECKING([for API tracing]);
AC_ARG_ENABLE([trace],
              [AC_HELP_STRING([--enable-trace],
                              [Enable API tracing capability. Default=no
                               if debug is disabled.])],
              TRACE=$enableval)

dnl Default to no if debug is disabled
if test "X-$TRACE" = X- ; then
  if test -z "$DEBUG_PKG" ; then
    TRACE=no
  else
    TRACE=yes
  fi
fi

case "X-$TRACE" in
  X-yes)
    AC_MSG_RESULT([yes])
    TRACE_API=yes
    H5_CPPFLAGS="$H5_CPPFLAGS -DH5_DEBUG_API"
    ;;
  X-no|*)
    AC_MSG_RESULT([no])
    TRACE_API=no
    H5_CPPFLAGS="$H5_CPPFLAGS -UH5_DEBUG_API"
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Enable instrumenting of the library's internal operations
dnl This must come after the enable-debug since it depends on debug.
dnl
AC_SUBST([INSTRUMENT_LIBRARY])
AC_MSG_CHECKING([for instrumented library]);
AC_ARG_ENABLE([instrument],
              [AC_HELP_STRING([--enable-instrument],
                              [Enable library instrumentation of optimization
                                tracing.  Default=no if debug is disabled.])],
              INSTRUMENT=$enableval)

dnl Default to no if debug is disabled
if test "X-$INSTRUMENT" = X- ; then
  if test -z "$DEBUG_PKG" ; then
    INSTRUMENT=no
  else
    INSTRUMENT=yes
  fi
fi

case "X-$INSTRUMENT" in
  X-yes)
    AC_MSG_RESULT([yes])
    INSTRUMENT_LIBRARY=yes
    AC_DEFINE([HAVE_INSTRUMENTED_LIBRARY], [1],
              [Define if library will contain instrumentation to detect correct optimization operation])
    ;;
  X-no|*)
    AC_MSG_RESULT([no])
    INSTRUMENT_LIBRARY=no
    ;;
esac

dnl Checkpoint the cache
AC_CACHE_SAVE

dnl What header files and libraries do we have to look for for parallel
dnl support?  For the most part, search paths are already specified with
dnl CPPFLAGS and LDFLAGS or are known to the compiler.  If the user says
dnl `--disable-parallel' but specifies a known parallel compiler (like mpicc
dnl or mpcc) then parallel support is enabled but configure doesn't search
dnl for any parallel header files or libraries.
dnl
AC_ARG_ENABLE([parallel],
              [AC_HELP_STRING([--enable-parallel],
                              [Search for MPI-IO and MPI support files])])

dnl The --enable-parallel flag is not compatible with --enable-cxx.
dnl If the user tried to specify both flags, throw an error.
if test "X${HDF_CXX}" = "Xyes" -a "X${enable_parallel}" = "Xyes"; then
  AC_MSG_ERROR([--enable-cxx and --enable-parallel flags are incompatible])
fi

dnl --enable-parallel is also incompatible with --enable-threadsafe.
if test "X${THREADSAFE}" = "Xyes" -a "X${enable_parallel}" = "Xyes"; then
  AC_MSG_ERROR([--enable-threadsafe and --enable-parallel flags are incompatible])
fi

dnl It's possible to build in parallel by specifying a parallel compiler
dnl without using the --enable-parallel flag.  This isn't allowed with
dnl C++ or threadsafe, either.
if test "X${PARALLEL}" != "X" -a "X${enable_cxx}" = "Xyes" ; then
  AC_MSG_ERROR([An MPI compiler is being used; --enable-cxx is not allowed])
fi
if test "X${PARALLEL}" != "X" -a "X${THREADSAFE}" = "Xyes"; then
  AC_MSG_ERROR([An MPI compiler is being used; --enable-threadsafe is not allowed])
fi

AC_MSG_CHECKING([for parallel support files])
case "X-$enable_parallel" in
  X-|X-no|X-none)
    dnl Either we are not compiling for parallel or the header and
    dnl library files and locations are known to the compiler (this is
    dnl the case for a correct installation of mpicc for instance).
    AC_MSG_RESULT([skipped])
    ;;

  X-yes)
    dnl We want to compile a parallel library with a compiler that
    dnl may already know how to link with MPI and MPI-IO.
    AC_MSG_RESULT([provided by compiler])
    PARALLEL=yes

    dnl Try link a simple MPI program.  If fail, try again with -lmpi and
    dnl -lmpich.
    AC_TRY_LINK(, MPI_Init(),, \
	AC_CHECK_LIB(mpi, MPI_Init,, \
	    AC_CHECK_LIB(mpich, MPI_Init,, PARALLEL=no)))

    dnl Then try link a simple MPI-IO program. If fail, try again with
    dnl -lmpio.
    if test "X$PARALLEL" = "Xyes"; then
      AC_TRY_LINK(, [MPI_File_open()],,
                  [AC_CHECK_LIB([mpio], [MPI_File_open],, [PARALLEL=no])])
    fi

    if test "X$HDF_FORTRAN" = "Xyes"; then
      dnl Change to the Fortran 90 language
      AC_LANG_PUSH(Fortran)

      dnl Try link a simple MPI program.  If fail, try again with -lmpi.
      AC_LINK_IFELSE([
          program main
          include 'mpif.h'
          integer:: ierr
          call mpi_file_open( ierr )
          end],,
          AC_CHECK_LIB(mpi, [
            include 'mpif.h'
            integer:: ierr
            call mpi_file_open( ierr )],, PARALLEL=no))

      dnl Then try link a simple MPI-IO program.  If fail, try again with
      dnl -lmpio.
      if test "X$PARALLEL" = "Xyes"; then
        AC_LINK_IFELSE([
            program main
            include 'mpif.h'
            integer:: ierr
            call mpi_file_open( ierr )
            end],,
            AC_CHECK_LIB(mpio, [
              include 'mpif.h'
              integer:: ierr
              call mpi_file_open( ierr )],, PARALLEL=no))
      fi

      dnl Change to the C language
      AC_LANG_POP(Fortran)
    fi

    dnl Set RUNPARALLEL to mpirun if not set yet.
    if test "X$PARALLEL" = "Xyes" -a -z "$RUNPARALLEL"; then
      RUNPARALLEL="mpirun -np \$\${NPROCS:=3}"
    fi
    ;;

  *)
    AC_MSG_RESULT([error])
    AC_MSG_ERROR([\'$enable_parallel\' is not a valid parallel search type])
    ;;
esac

dnl ----------------------------------------------------------------------
dnl Print some other parallel information and do some sanity checks.
dnl
AC_SUBST([ADD_PARALLEL_FILES]) ADD_PARALLEL_FILES="no"

if test -n "$PARALLEL"; then
  dnl The 'testpar' directory should participate in the build
  TESTPARALLEL=testpar

  dnl We are building a parallel library
  AC_DEFINE([HAVE_PARALLEL], [1], [Define if we have parallel support])

  dnl Display what we found about running programs
  AC_MSG_CHECKING([prefix for running on one processor])
  AC_MSG_RESULT([$RUNSERIAL])
  AC_MSG_CHECKING([prefix for running in parallel])
  AC_MSG_RESULT([$RUNPARALLEL])

  dnl Check that we can link a simple MPI and MPI-IO application
  AC_MSG_CHECKING([whether a simple MPI-IO program can be linked])
  AC_TRY_LINK(, [MPI_Init(); MPI_File_open();],
              AC_MSG_RESULT([yes]),
              AC_MSG_RESULT([no])
              AC_MSG_ERROR([unable to link a simple MPI-IO application]))

  dnl There *must* be some way to run in parallel even if it's just the
  dnl word `none'.
  if test -z "$RUNPARALLEL"; then
    AC_MSG_ERROR([no way to run a parallel program])
  fi

  dnl If RUNSERIAL or RUNPARALLEL is the word `none' then replace it with
  dnl the empty string.
  if test "X$RUNSERIAL" = "Xnone"; then
    RUNSERIAL=""
  fi
  if test "X$RUNPARALLEL" = "Xnone"; then
    RUNPARALLEL=""
  fi

  if test "X$HDF_FORTRAN" = "Xyes"; then
    ADD_PARALLEL_FILES="yes"
    AC_MSG_CHECKING([for MPI_Comm_c2f and MPI_Comm_f2c functions])

    AC_TRY_LINK([#include <mpi.h>],
      [MPI_Comm c_comm; MPI_Comm_c2f(c_comm)],
      AC_DEFINE([HAVE_MPI_MULTI_LANG_Comm], [1],
                [Define if `MPI_Comm_c2f' and `MPI_Comm_f2c' exists])
      AC_MSG_RESULT([yes]),
      AC_MSG_RESULT([no])
    )

    AC_MSG_CHECKING([for MPI_Info_c2f and MPI_Info_f2c functions])
    AC_TRY_LINK([#include <mpi.h>],
      [MPI_Info c_info; MPI_Info_c2f(c_info)],
      AC_DEFINE([HAVE_MPI_MULTI_LANG_Info], [1],
                [Define if `MPI_Info_c2f' and `MPI_Info_f2c' exists])
      AC_MSG_RESULT([yes]),
      AC_MSG_RESULT([no])
    )
  fi

  dnl --------------------------------------------------------------------
  dnl Do we want MPE instrumentation feature on?
  dnl
  dnl This must be done after enable-parallel is checked since it depends
  dnl on a mpich compiler.
  dnl
  AC_SUBST([MPE]) MPE=yes
  AC_ARG_WITH([mpe],
              [AC_HELP_STRING([--with-mpe=DIR],
                              [Use MPE instrumentation [default=no]])],,
              [withval=no])

  case "X-$withval" in
    X-|X-no|X-none)
      AC_MSG_CHECKING([for MPE])
      AC_MSG_RESULT([suppressed])
      unset MPE
      ;;
    X-yes)
      AC_CHECK_HEADERS([mpe.h],, [unset MPE])
      AC_CHECK_LIB([mpe], [MPE_Init_log],, [unset MPE])
      AC_CHECK_LIB([lmpe], [CLOG_Init],, [unset MPE])
      ;;
    *)
      case "$withval" in
        *,*)
          mpe_inc="`echo $withval | cut -f1 -d,`"
          mpe_lib="`echo $withval | cut -f2 -d, -s`"
          ;;
        *)
          if test -n "$withval"; then
            mpe_inc="$withval/include"
            mpe_lib="$withval/lib"
          fi
          ;;
      esac
  
      dnl Trying to include -I/usr/include and -L/usr/lib is redundant and
      dnl can mess some compilers up.
      if test "X$mpe_inc" = "X/usr/include"; then
        mpe_inc=""
      fi
      if test "X$mpe_lib" = "X/usr/lib"; then
        mpe_lib=""
      fi
  
      if test -n "$mpe_inc"; then
        saved_CPPFLAGS="$CPPFLAGS"
        CPPFLAGS="$CPPFLAGS -I$mpe_inc"
        AC_CHECK_HEADERS([mpe.h],, [CPPFLAGS="$saved_CPPFLAGS"; unset MPE])
      else
        AC_CHECK_HEADERS([mpe.h],, [unset MPE])
      fi
  
      if test -n "$mpe_lib"; then
        saved_LDFLAGS="$LDFLAGS"
        LDFLAGS="$LDFLAGS -L$mpe_lib"
        AC_CHECK_LIB([mpe], [MPE_Init_log],,
                     [LDFLAGS="$saved_LDFLAGS"; unset MPE])
        AC_CHECK_LIB([lmpe], [CLOG_Init],,
                     [LDFLAGS="$saved_LDFLAGS"; unset MPE])
      else
        AC_CHECK_LIB([mpe], [MPE_Init_log],, [unset MPE])
        AC_CHECK_LIB([lmpe], [CLOG_Init],, [unset MPE])
      fi
      ;;
  esac

  if test "X-$MPE" = "X-yes"; then
    AC_DEFINE([HAVE_MPE], [1], [Define if we have MPE support])
  fi

  dnl ----------------------------------------------------------------------
  dnl Set the flag to indicate that the MPI_File_set_size() function
  dnl works with files over 2GB, unless it's already set in the cache.
  dnl (This flag should be set for all machines, except for ASCI Red, where
  dnl the cache value is set in it's config file)
  dnl
  AC_MSG_CHECKING([if MPI_File_set_size works for files over 2GB])
  AC_CACHE_VAL([hdf5_cv_mpi_file_set_size_big], [hdf5_cv_mpi_file_set_size_big=yes])
  
  if test ${hdf5_cv_mpi_file_set_size_big} = "yes"; then
    AC_DEFINE([MPI_FILE_SET_SIZE_BIG], [1],
              [Define if your system's `MPI_File_set_size' function works for files over 2GB.])
    AC_MSG_RESULT([yes])
  else
    AC_MSG_RESULT([no])
  fi

dnl ----------------------------------------------------------------------
dnl Check to see whether the complicate MPI derived datatype works. 
dnl In Dec. 20th, 2004, we found that IBM's MPIO implemention didn't
dnl handle with the displacement of the complicate MPI type derived datatype 
dnl correctly. So we add the check here.
dnl IBM fixed this bug in their new version that supported MPI-IO around spring 2005. 
dnl We find that mpich 1.2.5 has the similar bug. The same
dnl bug also occurs at SGI IRIX 6.5 C with compiler version lower than or equal to 7.3.
dnl In case people still use the old compiler, we keep this flag.
AC_MSG_CHECKING([if irregular hyperslab optimization code works inside MPI-IO])

AC_CACHE_VAL([hdf5_mpi_complex_derived_datatype_works],[hdf5_mpi_complex_derived_datatype_works=yes])

if test ${hdf5_mpi_complex_derived_datatype_works} = "yes"; then
  AC_DEFINE([MPI_COMPLEX_DERIVED_DATATYPE_WORKS], [1],
            [Define if your system can handle complicated MPI derived datatype correctly.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi


dnl ----------------------------------------------------------------------
dnl Check to see whether MPI-IO can do collective IO successfully when one or more processes don't do 
dnl any IOs.
dnl Up to now(Feb. 8th, 2006), we find that it will cause program hung with mpich 1.2.x version 
dnl and SGI altix. For those systems, we have to turn off this feature and use independent IO instead.
dnl
AC_MSG_CHECKING([if MPI-IO can do collective IO when one or more processes don't do IOs])

AC_CACHE_VAL([hdf5_mpi_special_collective_io_works],[hdf5_mpi_special_collective_io_works=yes])

if test ${hdf5_mpi_special_collective_io_works} = "yes"; then
  AC_DEFINE([MPI_SPECIAL_COLLECTIVE_IO_WORKS], [1],
            [Define if your system can handle special collective IO properly.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi
fi

dnl ----------------------------------------------------------------------
dnl Turn on internal I/O filters by setting macros in header files
dnl Internal I/O filters are contained entirely within the library and do
dnl not depend on external headers or libraries.  The shuffle filter is
dnl an example of an internal filter, while the gzip filter is an example of
dnl an external filter.  Each external filter is controlled with an
dnl "--with-foo=" configure flag.
dnl
AC_SUBST([FILTERS])
AC_SUBST(USE_FILTER_SHUFFLE) USE_FILTER_SHUFFLE="no"
AC_SUBST(USE_FILTER_FLETCHER32) USE_FILTER_FLETCHER32="no"
AC_SUBST(USE_FILTER_NBIT) USE_FILTER_NBIT="no"
AC_SUBST(USE_FILTER_SCALEOFFSET) USE_FILTER_SCALEOFFSET="no"
AC_MSG_CHECKING([for I/O filters])
AC_ARG_ENABLE([filters],
              [AC_HELP_STRING([--enable-filters=all],
                              [Turn on all internal I/O filters. One may
                               also specify a comma-separated list of filters
                               or the word no.  The default is all internal
                               I/O filters.])],
              [FILTERS=$enableval])

dnl Eventually: all_filters="shuffle,foo,bar,baz"
all_filters="shuffle,fletcher32,nbit,scaleoffset"
case "X-$FILTERS" in
  X-|X-all)
    FILTERS=$all_filters
    AC_MSG_RESULT([all ($FILTERS)])
    ;;
  X-no|X-none)
    AC_MSG_RESULT([none])
    FILTERS="none"
    ;;
  *)
    AC_MSG_RESULT([$FILTERS])
    ;;
esac

if test -n "$FILTERS"; then
  for filter in `echo $FILTERS | tr ${as_cr_letters}',' ${as_cr_LETTERS}' '`; do
    dnl ------------------------------------------------------------------
    dnl Have to use separate 'if' construct for each filter, so that
    dnl autoheader can detect the AC_DEFINE for each one...
    dnl
    if test $filter = "SHUFFLE"; then
      AC_DEFINE([HAVE_FILTER_SHUFFLE], [1],
                [Define if support for shuffle filter is enabled])
      USE_FILTER_SHUFFLE="yes"
    fi
    if test $filter = "FLETCHER32"; then
      AC_DEFINE([HAVE_FILTER_FLETCHER32], [1],
                [Define if support for Fletcher32 checksum is enabled])
      USE_FILTER_FLETCHER32="yes"
    fi
    if test $filter = "NBIT"; then
      AC_DEFINE([HAVE_FILTER_NBIT], [1],
                [Define if support for nbit filter is enabled])
      USE_FILTER_NBIT="yes"
    fi
    if test $filter = "SCALEOFFSET"; then
      AC_DEFINE([HAVE_FILTER_SCALEOFFSET], [1],
                [Define if support for scaleoffset filter is enabled])
      USE_FILTER_SCALEOFFSET="yes"
    fi
  done
fi

dnl ----------------------------------------------------------------------
dnl This is defined only when we're using CodeWarrior, since it has a
dnl broken "open()" call.
dnl
if test 1 = 2; then
  AC_DEFINE([NO_SHARED_WRITING], [1],
            [Define if shared writing must be disabled (CodeWarrior only)])
fi

dnl -----------------------------------------------------------------------------
dnl Should the Stream Virtual File Driver be compiled in ?
dnl
AC_MSG_CHECKING([for Stream Virtual File Driver support])
AC_ARG_ENABLE([stream-vfd],
              [AC_HELP_STRING([--enable-stream-vfd],
                              [Build the Stream Virtual File Driver
                               [default=yes]])],
              [STREAM_VFD=$enableval],
              [STREAM_VFD=default])

dnl If the user explicitly disabled Stream VFD, say so.
if test "$STREAM_VFD" != "yes" -a "$STREAM_VFD" != "default"; then
  AC_MSG_RESULT([not configured])
fi

dnl If stream VFD is being used with parallel, disable it, unless the user
dnl explicity enables it via the '--enable-stream_vfd' option.
if test "$STREAM_VFD" = "default" -a "X${enable_parallel}" = "Xyes"; then
    AC_MSG_RESULT([disabled in parallel])
    STREAM_VFD=no
elif test "$STREAM_VFD" = "yes" -a "X${enable_parallel}" = "Xyes"; then
    AC_MSG_RESULT([enabled by user])
elif test "$STREAM_VFD" = "default" -a "X${PARALLEL}" != "X"; then
    AC_MSG_RESULT([disabled when a parallel compiler is being used])
    STREAM_VFD=no
elif test "$STREAM_VFD" = "yes" -a "X${PARALLEL}" != "X"; then
    AC_MSG_RESULT([enabled by user])
elif test "$STREAM_VFD" = "yes"; then
    AC_MSG_RESULT([yes])
fi

if test "$STREAM_VFD" = "default"; then
    AC_MSG_RESULT([yes])
    STREAM_VFD=yes
fi

dnl Otherwise, use Stream VFD.
if test "$STREAM_VFD" = "yes"; then
  AC_CHECK_HEADERS([netinet/in.h])
  AC_CHECK_HEADERS([netinet/tcp.h], , , [#include <netinet/in.h>])
  AC_CHECK_HEADERS([sys/filio.h])
  AC_DEFINE([HAVE_STREAM], [1],
            [Define if the stream virtual file driver should be compiled])

  dnl Check if 'socklen_t' available
  AC_MSG_CHECKING([if socklen_t is defined])
  AC_TRY_COMPILE([
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
  ],
    [socklen_t foo; return 0;],
    AC_DEFINE([HAVE_SOCKLEN_T], 1, [Define if `socklen_t' is defined])
    AC_MSG_RESULT([yes]),
    AC_MSG_RESULT([no])
  )
fi

dnl ----------------------------------------------------------------------
dnl Check if Direct I/O driver is enabled by --enable-direct-vfd
dnl

AC_MSG_CHECKING([for Direct Virtual File Driver support])

AC_ARG_ENABLE([direct-vfd],
              [AC_HELP_STRING([--enable-direct-vfd],
                              [Build the Direct I/O Virtual File Driver
                               [default=yes]])],
              [DIRECT_VFD=$enableval], [DIRECT_VFD=yes])

if test "$DIRECT_VFD" = "yes"; then
   AC_CACHE_VAL([hdf5_direct_io],
       [AC_TRY_RUN([
	  #include <sys/types.h>
	  #include <sys/stat.h>
	  #include <fcntl.h>
          int main(void)
          {
             int fid; 
             if((fid=open("tst_file", O_CREAT | O_TRUNC | O_DIRECT, 0755))<0)
		exit(1);
             close(fid);  
             remove("tst_file"); 
             exit (0);
          }], AC_TRY_LINK(, [posix_memalign()], [hdf5_direct_io=yes], [hdf5_direct_io=no]), [hdf5_direct_io=no],)])

   if test ${hdf5_direct_io} = "yes"; then
      AC_MSG_RESULT([yes])
      AC_DEFINE([HAVE_DIRECT], [1],
                [Define if the direct I/O virtual file driver should be compiled])
   else
      AC_MSG_RESULT([no])
      DIRECT_VFD=no
   fi
else
      AC_MSG_RESULT([suppressed])
fi

AM_CONDITIONAL([DIRECT_VFD_CONDITIONAL], [test "X$DIRECT_VFD" = "Xyes"])

dnl ----------------------------------------------------------------------
dnl Decide whether the presence of user's exception handling functions is
dnl checked and data conversion exceptions are returned.  This is mainly
dnl for the speed optimization of hard conversions.  Soft conversions can
dnl actually benefit little.  
dnl
AC_MSG_CHECKING([whether exception handling functions is checked during data conversions])
AC_ARG_ENABLE([dconv-exception],
              [AC_HELP_STRING([--enable-dconv-exception],
                              [if exception handling functions is checked during 
                              data conversions [default=yes]])],
              [DCONV_EXCEPTION=$enableval], [DCONV_EXCEPTION=yes])

if test "$DCONV_EXCEPTION" = "yes"; then
  AC_MSG_RESULT([yes])
  AC_DEFINE([WANT_DCONV_EXCEPTION], [1],
            [Check exception handling functions during data conversions])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Decide whether the data accuracy has higher priority during data
dnl conversions.  If not, some hard conversions will still be prefered even
dnl though the data may be wrong (for example, some compilers don't 
dnl support denormalized floating values) to maximize speed.
dnl 
AC_MSG_CHECKING([whether data accuracy is guaranteed during data conversions])
AC_ARG_ENABLE([dconv-accuracy],
              [AC_HELP_STRING([--enable-dconv-accuracy],
                              [if data accuracy is guaranteed during 
                              data conversions [default=yes]])],
              [DATA_ACCURACY=$enableval], [DATA_ACCURACY=yes])

if test "$DATA_ACCURACY" = "yes"; then
  AC_MSG_RESULT([yes])
  AC_DEFINE([WANT_DATA_ACCURACY], [1],
            [Data accuracy is prefered to speed during data conversions])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can handle converting
dnl denormalized floating-point values.
dnl (This flag should be set for all machines, except for the Crays, where
dnl the cache value is set in it's config file)
dnl
AC_MSG_CHECKING([if converting denormalized floating-point values is possible])
AC_CACHE_VAL([hdf5_cv_convert_denormal_float], [hdf5_cv_convert_denormal_float=yes])

if test ${hdf5_cv_convert_denormal_float} = "yes"; then
  AC_DEFINE([CONVERT_DENORMAL_FLOAT], [1],
            [Define if your system can handle converting denormalized floating-point values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can handle converting
dnl floating-point to long long values.
dnl (This flag should be _unset_ for all machines, except for Windows, where
dnl it's set in the custom Windows H5pubconf.h file)
dnl
AC_MSG_CHECKING([if converting floating-point values to long long is not working])
AC_CACHE_VAL([hdf5_cv_convert_float_llong_not_works], [hdf5_cv_convert_float_llong_not_works=no])

if test ${hdf5_cv_convert_float_llong_not_works} = "yes"; then
  AC_DEFINE([HW_FP_TO_LLONG_NOT_WORKS], [1],
            [Define if your system can't handle converting floating-point values to long long.])
  AC_MSG_RESULT([true])
else
  AC_MSG_RESULT([false])
fi

dnl -----------------------------------------------------------------------
dnl Set flag to indicate that the machine can handle conversion from 
dnl long double to integers accurately.  This flag should be set "yes" for 
dnl all machines except all SGIs.  For SGIs, some conversions are
dnl incorrect and its cache value is set "no" in its config/irix6.x and 
dnl irix5.x.
dnl
AC_MSG_CHECKING([if converting from long double to integers is accurate])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_ldouble_to_integer_accurate=${hdf5_ldouble_to_integer_accurate=no}
else
   AC_CACHE_VAL([hdf5_cv_ldouble_to_integer_accurate], [hdf5_cv_ldouble_to_integer_accurate=yes])
fi

if test "${hdf5_cv_ldouble_to_integer_accurate}" = "yes"; then
  AC_DEFINE([LDOUBLE_TO_INTEGER_ACCURATE], [1],
            [Define if your system can convert long double to integers accurately.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl -----------------------------------------------------------------------
dnl Set flag to indicate that the machine can do conversion from 
dnl long double to integers regardless of accuracy.  This flag should be 
dnl set "yes" for all machines except HP-UX 11.00.  For HP-UX 11.00, the
dnl compiler has 'floating exception' when converting 'long double' to all 
dnl integers except 'unsigned long long'.  Other HP-UX systems are unknown
dnl yet. (1/8/05 - SLU)

AC_MSG_CHECKING([if converting from long double to integers works])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_ldouble_to_integer_works=${hdf5_ldouble_to_integer_works=no}
else
   AC_CACHE_VAL([hdf5_ldouble_to_integer_works],
        [AC_TRY_RUN([
        int main(void)
        {
            void *align;
            long double ld= 9701917572145405952.00L;
            unsigned char v1;
            short v2;
            unsigned int v3;
            int  ret = 0;

            align = (void*)malloc(sizeof(long double));
            memcpy(align, &ld, sizeof(long double));

            /*For HU-UX11.00, there's floating exception(core dump) when doing some of casting
             *from 'long double' to integers*/
            v1=(unsigned char)(*((long double*)align));
            v2=(short)(*((long double*)align));
            v3=(unsigned int)(*((long double*)align));

    done:
            exit(ret);
        }
        ], [hdf5_ldouble_to_integer_works=yes], [hdf5_ldouble_to_integer_works=no],)])
fi

if test ${hdf5_ldouble_to_integer_works} = "yes"; then
  AC_DEFINE([LDOUBLE_TO_INTEGER_WORKS], [1],
            [Define if your system can convert from long double to integer values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl -----------------------------------------------------------------------
dnl Set flag to indicate that the machine can handle conversion from 
dnl integers to long double.  (This flag should be set "yes" for all 
dnl machines except all SGIs, where some conversions are
dnl incorrect and its cache value is set "no" in its config/irix6.x and 
dnl irix5.x) 
dnl
AC_MSG_CHECKING([if accurately converting from integers to long double])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_integer_to_ldouble_accurate=${hdf5_cv_integer_to_ldouble_accurate=no}
else
   AC_CACHE_VAL([hdf5_cv_integer_to_ldouble_accurate], [hdf5_cv_integer_to_ldouble_accurate=yes])
fi

if test ${hdf5_cv_integer_to_ldouble_accurate} = "yes"; then
  AC_DEFINE([INTEGER_TO_LDOUBLE_ACCURATE], [1],
            [Define if your system can accurately convert from integers to long double values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can accurately convert
dnl 'unsigned (long) long' values to 'float' and 'double' values.
dnl (This flag should be set for all machines, except for the SGIs, where
dnl the cache value is set in the config/irix6.x config file) and Solaris
dnl 64-bit machines, where the short program below tests if round-up is 
dnl correctly handled.
dnl
AC_MSG_CHECKING([if accurately converting unsigned long long to floating-point values])

if test ${host_os_novers} = "solaris2.x"; then
    AC_CACHE_VAL([hdf5_cv_ulong_to_fp_bottom_bit_accurate],
    [AC_TRY_RUN([
    int main(void)
    {
        unsigned long l1;
        unsigned long l2;
        unsigned long l3;
        unsigned long l4;
        unsigned long long ld1;
        unsigned long long ld2;
        unsigned long long ld3;
        unsigned long long ld4;
        double        d1, d2, d3, d4;
        unsigned char s[8];
        int           ret = 0;

        if(sizeof(unsigned long)==8) {
            l1 = 0xf000000000000b00UL; /*Round-down case*/
            l2 = 0xf000000000000401UL; /*Round-up case*/
            l3 = 0xf000000000000400UL; /*Round-down case*/
            l4 = 0xf000000000000c00UL; /*Round-up case*/
            
            d1 = (double)l1;
            d2 = (double)l2;
            d3 = (double)l3;
            d4 = (double)l4;
        } else if(sizeof(unsigned long long)==8) { 
            ld1 = 0xf000000000000b00ULL; /*Round-down case*/
            ld2 = 0xf000000000000401ULL; /*Round-up case*/
            ld3 = 0xf000000000000400ULL; /*Round-down case*/
            ld4 = 0xf000000000000c00ULL; /*Round-up case*/
            
            d1 = (double)ld1;
            d2 = (double)ld2;
            d3 = (double)ld3;
            d4 = (double)ld4;
        } else {
            ret = 1;
            goto done;
        }
        
        memcpy(s, &d1, 8);
        if(s[7]!=1)
            ret = 1;

        memcpy(s, &d2, 8);
        if(s[7]!=1)
            ret = 1;

        memcpy(s, &d3, 8);
        if(s[7]!=0)
            ret = 1;

        memcpy(s, &d4, 8);
        if(s[7]!=2)
            ret = 1;

done:
        exit(ret);
    }
    ], [hdf5_cv_ulong_to_fp_bottom_bit_accurate=yes], [hdf5_cv_ulong_to_fp_bottom_bit_accurate=no],)])
else
    AC_CACHE_VAL([hdf5_cv_ulong_to_fp_bottom_bit_accurate], [hdf5_cv_ulong_to_fp_bottom_bit_accurate=yes])
fi

if test ${hdf5_cv_ulong_to_fp_bottom_bit_accurate} = "yes"; then
  AC_DEFINE([ULONG_TO_FP_BOTTOM_BIT_ACCURATE], [1],
            [Define if your system can accurately convert unsigned (long) long values to floating-point values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can accurately convert
dnl 'float' or 'double' to 'unsigned long long' values.
dnl (This flag should be set for all machines, except for PGI compiler 
dnl where round-up happens when the fraction of float-point value is greater 
dnl than 0.5.
dnl
AC_MSG_CHECKING([if accurately roundup converting floating-point to unsigned long long values])

AC_CACHE_VAL([hdf5_fp_to_ullong_accurate],
    [AC_TRY_RUN([
    int main(void)
    {
        float  f = 111.60f;
        double d = 222.55L;
        unsigned long long l1 = (unsigned long long)f;
        unsigned long long l2 = (unsigned long long)d;
        int           ret = 0;

        if(l1 == 112) 
            ret = 1;
        if(l2 == 223) 
            ret = 1;

done:
        exit(ret);
    }
    ], [hdf5_fp_to_ullong_accurate=yes], [hdf5_fp_to_ullong_accurate=no],)])

if test ${hdf5_fp_to_ullong_accurate} = "yes"; then
  AC_DEFINE([FP_TO_ULLONG_ACCURATE], [1],
            [Define if your system roundup accurately converting floating-point to unsigned long long values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can accurately convert
dnl 'float', 'double' or 'long double' to 'unsigned long long' values.
dnl (This flag should be set for all machines, except for HP-UX machines
dnl where the maximal number for unsigned long long is 0x7fffffffffffffff
dnl during conversion.
dnl
AC_MSG_CHECKING([if right maximum converting floating-point to unsigned long long values])

AC_CACHE_VAL([hdf5_fp_to_ullong_right_maximum],
    [AC_TRY_RUN([
    int main(void)
    {
        float  f = 9701917572145405952.00f;
        double d1 = 9701917572145405952.00L;
        long double d2 = 9701917572145405952.00L;
        double d3 = 2e40L;
        unsigned long long l1 = (unsigned long long)f;
        unsigned long long l2 = (unsigned long long)d1;
        unsigned long long l3 = (unsigned long long)d2;
        unsigned long long l4;
        unsigned long long l5 = 0x7fffffffffffffffULL;
        int           ret = 0;

        if(l1 <= l5 || l2 <= l5 || l3 <= l5) 
            ret = 1;

        l4 = (unsigned long long)d3;
        if(l4 <= l5)
            ret = 1;

done:
        exit(ret);
    }
    ], [hdf5_fp_to_ullong_right_maximum=yes], [hdf5_fp_to_ullong_right_maximum=no],)])

if test ${hdf5_fp_to_ullong_right_maximum} = "yes"; then
  AC_DEFINE([FP_TO_ULLONG_RIGHT_MAXIMUM], [1],
            [Define if your system has right maximum convert floating-point to unsigned long long values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can accurately convert
dnl 'long double' to 'unsigned int' values.  (This flag should be set for 
dnl all machines, except for some Intel compilers on some Linux.)
dnl
AC_MSG_CHECKING([if correctly converting long double to unsigned int values])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_ldouble_to_uint_accurate=${hdf5_ldouble_to_uint_accurate=no}
else
   AC_CACHE_VAL([hdf5_ldouble_to_uint_accurate],
        [AC_TRY_RUN([
        int main(void)
        {
            long double ld = 2733248032.9183987530L;
            unsigned int i;
            int           ret = 0;

            i = (unsigned int)ld;
            if(i!=2733248032 && i!=2733248031 && i!=2733248033)
                ret = 1;

    done:
            exit(ret);
        }
        ], [hdf5_ldouble_to_uint_accurate=yes], [hdf5_ldouble_to_uint_accurate=no],)])
fi

if test ${hdf5_ldouble_to_uint_accurate} = "yes"; then
  AC_DEFINE([LDOUBLE_TO_UINT_ACCURATE], [1],
            [Define if your system can convert long double to unsigned int values correctly.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can _compile_
dnl 'unsigned long long' to 'float' and 'double' typecasts.
dnl (This flag should be set for all machines, except for under Windows when
dnl compiled with Visual Studio 6, where the macro value is set in the
dnl src/H5pubconf.h file)
dnl
AC_MSG_CHECKING([if compiling unsigned long long to floating-point typecasts work])
AC_CACHE_VAL([hdf5_cv_ullong_to_fp_cast_works], [hdf5_cv_ullong_to_fp_cast_works=yes])

if test ${hdf5_cv_ullong_to_fp_cast_works} = "yes"; then
  AC_DEFINE([ULLONG_TO_FP_CAST_WORKS], [1],
            [Define if your system can compile unsigned long long to floating-point casts.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can _compile_
dnl 'long long' to 'float' and 'double' typecasts.
dnl (This flag should be set for all machines, except for under Windows when
dnl compiled with Visual Studio 6, where the macro value is set in the
dnl src/H5pubconf.h file)
dnl
AC_MSG_CHECKING([if compiling long long to floating-point typecasts work])
AC_CACHE_VAL([hdf5_cv_llong_to_fp_cast_works], [hdf5_cv_llong_to_fp_cast_works=yes])

if test ${hdf5_cv_llong_to_fp_cast_works} = "yes"; then
  AC_DEFINE([LLONG_TO_FP_CAST_WORKS], [1],
            [Define if your system can compile long long to floating-point casts.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can convert from
dnl 'unsigned long long' to 'long double' without precision loss.
dnl (This flag should be set for all machines, except for FreeBSD(sleipnir)
dnl where the last 2 bytes of mantissa are lost when compiler tries to do 
dnl the conversion, and Cygwin where compiler doesn't do rounding correctly.)
dnl
AC_MSG_CHECKING([if converting unsigned long long to long double with precision])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_ullong_to_ldouble_precision=${hdf5_cv_ullong_to_ldouble_precision=no}
else
   AC_CACHE_VAL([hdf5_cv_ullong_to_ldouble_precision],
        [AC_TRY_RUN([
        int main(void)
        {
            /* General variables */
            int endian;
            int tst_value = 1; 
            int ret = 0;

            /* For FreeBSD */
            unsigned long long l = 0xa601e80bda85fcefULL;
            long double ld;
            unsigned char *c1, *c2;
            size_t size;

            /* For Cygwin */
            unsigned long long l_cyg = 0xfffffffffffffff0ULL;
            long double ld_cyg;
            unsigned char *c2_cyg;
            size_t size_cyg;
            
            
            /* Determine this system's endianess */
            c1 = (unsigned char*)calloc(1, sizeof(int));
            memcpy((void*)c1, &tst_value, sizeof(int));
            if(c1[0]==1)
                endian = 0;  /* little endian */
            else 
                endian = 1;  /* big endian */
            
            /* For FreeBSD */     
            size = sizeof(long double);
            memset(&ld, 0, size); 
            ld = (long double)l;

            c2 = (unsigned char*)calloc(1, size);
            memcpy((void*)c2, &ld, size);

            /* Test if the last 2 bytes of mantissa are lost.  Mainly for FreeBSD on Intel
             * architecture(sleipnir) where it happens. */        
            /*if(endian==0 && c2[0]==0 && c2[1]==0)*/ /*little endian*/
            if(endian==0 && c2[0]==0) { /*little endian*/
                ret = 1;
                goto done;
            }

            /* For Cygwin */
            size_cyg = sizeof(long double);
            memset(&ld_cyg, 0, size); 
            ld_cyg = (long double)l_cyg;

            c2_cyg = (unsigned char*)calloc(1, size_cyg);
            memcpy((void*)c2_cyg, &ld_cyg, size_cyg);

            /* Test if the last 4 bytes(roughly) of mantissa are rounded up.  Mainly for Cygwin
             * where the values like 0xffffffffffffffff,  0xfffffffffffffffe, ..., 
             * 0xfffffffffffff000 ... are rounded up as 0x0000403f8000000000000000 
             * instead of 0x0000403effffffffffffffff, 0x0000403efffffffffffffffe, ..., 
             * 0x0000403efffffffffffff000 ...
             */    
            if(endian==0 && c2_cyg[0]==0 && c2_cyg[1]==0 && c2_cyg[2]==0 && c2_cyg[3]==0)
                ret = 1;

    done:
            if(c1)
                free(c1);
            if(c2)
                free(c2);
            if(c2_cyg)
                free(c2_cyg);
            exit(ret);
        }
        ], [hdf5_cv_ullong_to_ldouble_precision=yes], [hdf5_cv_ullong_to_ldouble_precision=no],)])
fi

if test ${hdf5_cv_ullong_to_ldouble_precision} = "yes"; then
  AC_DEFINE([ULLONG_TO_LDOUBLE_PRECISION], [1],
            [Define if your system can convert unsigned long long to long double with correct precision.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can handle overflow converting
dnl all floating-point to all integer types.
dnl (This flag should be set for all machines, except for Cray X1 where
dnl floating exception is generated when the floating-point value is greater
dnl than the maximal integer value).
dnl
AC_MSG_CHECKING([if overflows normally converting floating-point to integer values])

AC_CACHE_VAL([hdf5_cv_fp_to_integer_overflow_works],
    [AC_TRY_RUN([
    int main(void)
    {
        float  f = 2147483648.0f;
        int    i;

        i = (int)f;

done:
        exit(0);
    }
    ], [hdf5_cv_fp_to_integer_overflow_works=yes], [hdf5_cv_fp_to_integer_overflow_works=no],)])

if test ${hdf5_cv_fp_to_integer_overflow_works} = "yes"; then
  AC_DEFINE([FP_TO_INTEGER_OVERFLOW_WORKS], [1],
            [Define if your system can handle overflow converting floating-point to integer values.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can accurately convert
dnl 'long double' to '(unsigned) long long' values.  (This flag should be set for 
dnl all machines, except for Mac OS 10.4 and SGI IRIX64 6.5.  When the bit sequence
dnl of long double is 0x4351ccf385ebc8a0bfcc2a3c..., the values of (unsigned)long long
dnl start to go wrong on these two machines.  Adjusting it higher to 
dnl 0x4351ccf385ebc8a0dfcc... or 0x4351ccf385ebc8a0ffcc... will make the converted 
dnl values wildly wrong.  This test detects this wrong behavior and disable the test.  
dnl
AC_MSG_CHECKING([if correctly converting long double to (unsigned) long long values])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_ldouble_to_llong_accurate=${hdf5_ldouble_to_llong_accurate=no}
else
   AC_CACHE_VAL([hdf5_ldouble_to_llong_accurate],
        [AC_TRY_RUN([
        int main(void)
        {
            long double         ld = 20041683600089727.779961L;
            long long           ll;
            unsigned long long  ull;
            unsigned char       s[16];
            int                 ret = 0;
            
            if(sizeof(long double) == 16) {
                /*make sure the long double type is the same as the failing type 
                 *which has 16 bytes in size and 11 bits of exponent.  If it is,
                 *the bit sequence should be like below.  It's not 
                 *a decent way to check but this info isn't available. */   
                memcpy(s, &ld, 16);
                if(s[0]==0x43 && s[1]==0x51 && s[2]==0xcc && s[3]==0xf3 &&
                    s[4]==0x85 && s[5]==0xeb && s[6]==0xc8 && s[7]==0xa0 &&
                    s[8]==0xbf && s[9]==0xcc && s[10]==0x2a && s[11]==0x3c) {

                    /*slightly adjust the bit sequence (s[8]=0xdf).  The converted
                     *values will go wild on Mac OS 10.4 and IRIX64 6.5.*/ 
                    s[0]=0x43; s[1]=0x51; s[2]=0xcc; s[3]=0xf3;
                    s[4]=0x85; s[5]=0xeb; s[6]=0xc8; s[7]=0xa0;
                    s[8]=0xdf; s[9]=0xcc; s[10]=0x2a; s[11]=0x3c;
                    s[12]=0x3d; s[13]=0x85; s[14]=0x56; s[15]=0x20;

                    memcpy(&ld, s, 16);
                    ll = (long long)ld;
                    ull = (unsigned long long)ld;
                    
                    if(ll != 20041683600089728 || ull != 20041683600089728)
                        ret = 1;
                }    
            }    
    done:
            exit(ret);
        }
        ], [hdf5_ldouble_to_llong_accurate=yes], [hdf5_ldouble_to_llong_accurate=no],)])
fi

if test ${hdf5_ldouble_to_llong_accurate} = "yes"; then
  AC_DEFINE([LDOUBLE_TO_LLONG_ACCURATE], [1],
            [Define if your system can convert long double to (unsigned) long long values correctly.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine can accurately convert
dnl '(unsigned) long long' to 'long double' values.  (This flag should be set for 
dnl all machines, except for Mac OS 10.4, when the bit sequences are 003fff...,
dnl 007fff..., 00ffff..., 01ffff..., ..., 7fffff..., the converted values are twice
dnl as big as they should be. 
dnl
AC_MSG_CHECKING([if correctly converting (unsigned) long long to long double values])

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_llong_to_ldouble_correct=${hdf5_llong_to_ldouble_correct=no}
else
   AC_CACHE_VAL([hdf5_llong_to_ldouble_correct],
        [AC_TRY_RUN([
        int main(void)
        {
            long double         ld;
            long long           ll;
            unsigned long long  ull;
            unsigned char       s[16];
            int                 flag=0, ret=0;
        
            /*Determine if long double has 16 byte in size, 11 bit exponent, and
             *the bias is 0x3ff */ 
            if(sizeof(long double) == 16) { 
                ld = 1.0L;
                memcpy(s, &ld, 16);
                if(s[0]==0x3f && s[1]==0xf0 && s[2]==0x00 && s[3]==0x00 &&
                    s[4]==0x00 && s[5]==0x00 && s[6]==0x00 && s[7]==0x00) 
                    flag = 1; 
            }
             
            if(flag==1 && sizeof(long long)==8) {
                ll = 0x01ffffffffffffffLL;
                ld = (long double)ll;
                memcpy(s, &ld, 16);
                /*Check if the bit sequence is as supposed to be*/
                if(s[0]!=0x43 || s[1]!=0x7f || s[2]!=0xff || s[3]!=0xff ||
                    s[4]!=0xff || s[5]!=0xff || s[6]!=0xff || s[7]!=0xff ||
                    s[8]!=0xf0 || s[9]!=0x00 || s[10]!=0x00 || s[11]!=0x00)
                    ret = 1;
            }        
            if(flag==1 && sizeof(unsigned long long)==8) {
                ull = 0x01ffffffffffffffULL;
                ld = (long double)ull;
                memcpy(s, &ld, 16);
                if(s[0]!=0x43 || s[1]!=0x7f || s[2]!=0xff || s[3]!=0xff ||
                    s[4]!=0xff || s[5]!=0xff || s[6]!=0xff || s[7]!=0xff ||
                    s[8]!=0xf0 || s[9]!=0x00 || s[10]!=0x00 || s[11]!=0x00)
                    ret = 1;
            }        
    done:
            exit(ret);
        }
        ], [hdf5_llong_to_ldouble_correct=yes], [hdf5_llong_to_ldouble_correct=no],)])
fi

if test ${hdf5_llong_to_ldouble_correct} = "yes"; then
  AC_DEFINE([LLONG_TO_LDOUBLE_CORRECT], [1],
            [Define if your system can convert (unsigned) long long to long double values correctly.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set the flag to indicate that the machine generates bad code
dnl for the H5V_log2_gen() routine in src/H5Vprivate.h
dnl (This flag should be set to no for all machines, except for SGI IRIX64,
dnl where the cache value is set to yes in it's config file)
dnl
AC_MSG_CHECKING([if bad code for log2 routine is generated])
AC_CACHE_VAL([hdf5_cv_bad_log2_code_generated], [hdf5_cv_bad_log2_code_generated=no])

if test ${hdf5_cv_bad_log2_code_generated} = "yes"; then
  AC_DEFINE([BAD_LOG2_CODE_GENERATED], [1],
            [Define if your system generates wrong code for log2 routine.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

dnl ----------------------------------------------------------------------
dnl Set some variables for general configuration information to be saved
dnl and installed with the libraries.
dnl

dnl HDF5 version from the first line of the README.txt file.
H5_VERSION="`cut -d' ' -f3 $srcdir/README.txt | head -1`"
AC_SUBST([H5_VERSION])

dnl Configuration date
AC_SUBST([CONFIG_DATE]) CONFIG_DATE="`date`"

dnl User doing the configuration
AC_SUBST([CONFIG_USER]) CONFIG_USER="`whoami`@`hostname`"
if test -n "$ORGANIZATION"; then
  CONFIG_USER="$CONFIG_USER at $ORGANIZATION"
fi

dnl Configuration mode (production, development, profile, etc) saved above.
AC_SUBST([CONFIG_MODE])

dnl Byte sex from the AC_C_BIGENDIAN macro.
AC_SUBST([BYTESEX])
if test "X$ac_cv_c_bigendian" = "Xyes"; then
  BYTESEX="big-endian"
else
  BYTESEX="little-endian"
fi

dnl Are we compiling static libraries, shared libraries, or both?  This
dnl is only used for the libhdf5.settings file. We can't just look at
dnl $enable_static and $enable_shared because if they're yes the ltconfig
dnl might have decided that one or the other is simply not possible.
dnl Therefore we have to ask the generated `libtool' shell script
dnl which 'features' it has enabled.
AC_SUBST([STATIC_SHARED])
if (./libtool --features | grep '^enable shared libraries' > /dev/null); then
  enable_shared=yes
else
  enable_shared=no
fi

if (./libtool --features | grep '^enable static libraries' > /dev/null); then
  enable_static=yes
else
  enable_static=no
fi

if test "X$enable_static" = "Xyes" && test "X$enable_shared" = "Xyes"; then
  STATIC_SHARED="static, shared"
elif test "X$enable_static" = "Xyes"; then
  STATIC_SHARED="static"
elif test "X$enable_shared" = "Xyes"; then
  STATIC_SHARED="shared"
else
  STATIC_SHARED="none"
fi


dnl Parallel support? (set above except empty if none)
PARALLEL=${PARALLEL:-no}

dnl Compiler with version information. This consists of the full path
dnl name of the compiler and the reported version number.
AC_SUBST([CC_VERSION])
dnl Strip anything that looks like a flag off of $CC
CC_NOFLAGS=`echo $CC | sed 's/ -.*//'`

if `echo $CC_NOFLAGS | grep ^/ >/dev/null 2>&1`; then
  CC_VERSION="$CC"
else
  CC_VERSION="$CC";
  for x in `echo $PATH | sed -e 's/:/ /g'`; do
    if test -x $x/$CC_NOFLAG; then
      CC_VERSION="$x/$CC"
      break
    fi
  done
fi
if test -n "$cc_vendor" && test -n "$cc_version"; then
  CC_VERSION="$CC_VERSION ($cc_vendor-$cc_version)"
fi

dnl ----------------------------------------------------------------------
dnl Where is the root of the source tree. Give an absolute address so
dnl we can find it no matter which directory of the distribution is our
dnl current directory. The built-in pwd fails on some systems, but the
dnl /bin/pwd version works OK.
dnl
if test -x /bin/pwd; then
  pwd=/bin/pwd
else
  pwd=pwd
fi
AC_SUBST([ROOT]) ROOT="`$pwd`"

dnl ----------------------------------------------------------------------
dnl Move any compiler-specific libraries into the main LIBS varaible.
dnl 
LIBS="$DEFAULT_LIBS $LIBS"

dnl ----------------------------------------------------------------------
dnl Determine the runtime libraries we may need to include in the
dnl libtools command so that executables will find the correct dynamic
dnl libraries.
dnl 
AC_SUBST([DYNAMIC_DIRS]) DYNAMIC_DIRS=""

if test -n "$LDFLAGS"; then
  for d in $LDFLAGS ; do
    case "$d" in
      -L*)
        d="`echo $d | sed -e 's/-L//g'`"
        case "$d" in
          .*)
            dnl If the path isn't absolute, make it so by
            dnl prepending the ROOT directory to it.
            d=${ROOT}/$d
            ;;
        esac
        DYNAMIC_DIRS="-R${d} $DYNAMIC_DIRS"
        ;;
    esac
  done
fi

if test -n "$CPPFLAGS"; then
  TEMP_CPPFLAGS=""
  for d in $CPPFLAGS ; do
    case "$d" in
      -I.*)
        dnl If the path isn't absolute, make it so by prepending
        dnl the ROOT directory to it.
        d="`echo $d | sed -e 's/-I//g'`"
        d="-I${ROOT}/${d}"
        ;;
    esac
    TEMP_CPPFLAGS="$d $TEMP_CPPFLAGS"
  done
  CPPFLAGS=$TEMP_CPPFLAGS
fi

dnl ----------------------------------------------------------------------
dnl Check if they would like the High Level library  compiled
dnl

AC_SUBST(HL) HL=""
# name of fortran folder inside "hl", if FORTRAN compile is requested
AC_SUBST(HL_FOR) HL_FOR=""
AC_MSG_CHECKING([if high level library is enabled])
AC_ARG_ENABLE([hl],
     [AC_HELP_STRING([--enable-hl],
                     [Enable the high level library [default=yes]])],
     [HDF5_HL=$enableval],
     [HDF5_HL=yes])

if test "X$HDF5_HL" = "Xyes"; then
 echo "yes"
 HL="hl"
 AC_DEFINE([INCLUDE_HL], [1],
           [Define if HDF5's high-level library headers should be included in hdf5.h])
else
 echo "no"
fi

dnl ----------------------------------------------------------------------
dnl Some programs shouldn't be built by default (e.g., programs to generate
dnl data files used by tests, some optional tests).
dnl Check if they want such programs built anyway.
dnl
AC_MSG_CHECKING([additional programs should be built])
AC_ARG_ENABLE([build-all],
     [AC_HELP_STRING([--enable-build-all],
                     [Build helper programs that only developers should need [default=no]])],
     [BUILD_ALL=$enableval],
     [BUILD_ALL=no])

if test "X$BUILD_ALL" = "Xyes"; then
 echo "yes"
else
 echo "no"
fi
AM_CONDITIONAL([BUILD_ALL_CONDITIONAL], [test "X$BUILD_ALL" = "Xyes"])

dnl ----------------------------------------------------------------------
dnl Create automake conditionals to tell automake makefiles which directories
dnl need to be compiled

AM_CONDITIONAL([BUILD_CXX_CONDITIONAL], [test "X$HDF_CXX" = "Xyes"])
AM_CONDITIONAL([BUILD_PARALLEL_CONDITIONAL], [test -n "$TESTPARALLEL"])
AM_CONDITIONAL([BUILD_FORTRAN_CONDITIONAL], [test "X$HDF_FORTRAN" = "Xyes"])
AM_CONDITIONAL([BUILD_HDF5_HL_CONDITIONAL], [test "X$HDF5_HL" = "Xyes"])


dnl ----------------------------------------------------------------------
dnl Build the Makefiles.
dnl

dnl The directory search list
AC_SUBST([SEARCH]) SEARCH='$(srcdir) $(top_builddir)/src $(top_srcdir)/src'
cmd='echo $SEARCH |sed "s/ /'$SEARCH_SEP'/g"'
SEARCH="$SEARCH_RULE`eval $cmd`"
export SEARCH

dnl We don't need to say when we're entering directories if we're using
dnl GNU make because make does it for us.
if test "X$GMAKE" = "Xyes"; then
  AC_SUBST([SETX]) SETX=":"
else
  AC_SUBST([SETX]) SETX="set -x"
fi

dnl Some cleanup stuff
rm -f conftest conftest.o conftest.c dummy.o

dnl Build config.status, touch the stamp files, and build all the Makefiles.
dnl The order is such that the first `make' does not need to update any
dnl configuration information. See config/commence.in for the order in which
dnl things need to be done.

# First the stamp1 file for H5config.h.in
mkdir ./config >/dev/null 2>&1
touch ./config/stamp1

# Then the config.status file (but not makefiles)
saved_no_create=$no_create
no_create=yes

PARALLEL_MAKE=""
FORTRAN_PARALLEL_MAKE=""

if test -n "$TESTPARALLEL"; then
  PARALLEL_MAKE="$TESTPARALLEL/Makefile $TESTPARALLEL/testph5.sh"

  if test "X$HDF_FORTRAN" = "Xyes"; then
    FORTRAN_PARALLEL_MAKE=fortran/$TESTPARALLEL/Makefile
  fi
fi

AC_CONFIG_FILES([src/libhdf5.settings
                 Makefile
                 src/Makefile
                 test/Makefile
                 testpar/Makefile
                 testpar/testph5.sh
                 perform/Makefile
                 tools/Makefile
                 tools/h5dump/Makefile
                 tools/h5dump/testh5dump.sh
                 tools/h5dump/testh5dumpxml.sh
                 tools/h5import/Makefile
                 tools/h5diff/Makefile
                 tools/h5jam/Makefile
                 tools/h5jam/testh5jam.sh
                 tools/h5repack/Makefile
                 tools/h5repack/h5repack.sh
                 tools/h5ls/Makefile
                 tools/h5copy/Makefile
                 tools/lib/Makefile
                 tools/misc/Makefile
                 tools/misc/h5cc
                 tools/misc/testh5repart.sh
                 tools/misc/testh5stat.sh
                 examples/Makefile
                 examples/testh5cc.sh
                 c++/Makefile
                 c++/src/Makefile
                 c++/src/h5c++
                 c++/test/Makefile
                 c++/examples/Makefile
                 c++/examples/testh5c++.sh
                 fortran/Makefile
                 fortran/src/h5fc
                 fortran/src/libhdf5_fortran.settings
                 fortran/src/Makefile
                 fortran/test/Makefile
                 fortran/testpar/Makefile
                 fortran/examples/Makefile
                 fortran/examples/testh5fc.sh
                 hl/Makefile
                 hl/src/Makefile
                 hl/test/Makefile
                 hl/tools/Makefile
                 hl/tools/gif2h5/Makefile
                 hl/examples/Makefile
                 hl/c++/Makefile
                 hl/c++/src/Makefile
                 hl/c++/test/Makefile
                 hl/c++/examples/Makefile
                 hl/fortran/Makefile
                 hl/fortran/src/Makefile
                 hl/fortran/test/Makefile
                 hl/fortran/examples/Makefile])

AC_OUTPUT
no_create=$saved_no_create

# Then the stamp2 file for H5config.h
touch ./config/stamp2

# Finally the makefiles
test "$no_create" = yes || ${CONFIG_SHELL-/bin/sh} $CONFIG_STATUS || exit 1

chmod 755 tools/misc/h5cc

if test "X$HDF_FORTRAN" = "Xyes"; then
  chmod 755 fortran/src/h5fc
fi

if test "X$HDF_CXX" = "Xyes"; then
  chmod 755 c++/src/h5c++
fi

dnl We don't want inline defined for C++ compilers
dnl Don't worry about the C++ ifdef wrappers in the H5pubconf file, since
dnl 'H5_inline' isn't a C++ keyword.
cat >> src/H5config.h <<EOF

#if defined(__cplusplus) && defined(inline)
#undef inline
#endif
EOF

dnl ----------------------------------------------------------------------
dnl Print out a summary of what we are going to build.
dnl
if test -z "$ECHO_N" -o -z "$ECHO_C"; then
  if (echo "testing\c"; echo 1,2,3) | grep c >/dev/null; then
    if (echo -n testing; echo 1,2,3) | sed s/-n/xn/ | grep xn >/dev/null; then
      ECHO_N=''
      ECHO_C='
'
    else
      ECHO_N=-n
      ECHO_C=''
    fi
  else
    ECHO_N=''
    ECHO_C='\c'
  fi
fi

PRINT_PLAIN() {
  echo $ECHO_N "$1$ECHO_C"
  echo $ECHO_N "$1$ECHO_C" 1>>src/libhdf5.settings
}

PRINT_N() {
  echo $ECHO_N "$1:  $ECHO_C"
  echo $ECHO_N "$1:  $ECHO_C" 1>>src/libhdf5.settings
}

PRINT() {
  echo "$1"
  echo "$1" 1>>src/libhdf5.settings
}

dnl ----------------------------------------------------------------------
dnl Print "Yes" if all arguments are "yes", otherwise "No"
dnl
IF_YES_NO() {
  if test $# -lt 1; then
    PRINT "No"
    return
  else
    while test $# -gt 0; do
      if test "$1" != "yes"; then
        PRINT "No"
        return
      fi
      shift
    done
  fi
  PRINT "Yes"
}

IF_ENABLED_DISABLED() {
  if test "$1" = "yes"; then
    PRINT "Enabled"
  else
    PRINT "Disabled"
  fi
}

PRINT ""
PRINT "                       Configure Summary"
PRINT "                       ================="
PRINT ""
PRINT "Compiling Options:"
PRINT "------------------"

PRINT_N "               Compilation Mode"
case "X-$enable_production" in
  X-yes)        PRINT "Production" ;;
  X-no)         PRINT "Development" ;;
  X-profile)    PRINT "Profile" ;;
  *)            PRINT "$enable_production" ;;
esac

PRINT_N "                     C Compiler"
PRINT "$CC"

PRINT_N "                         CFLAGS / H5_CFLAGS"
PRINT "$CFLAGS"
PRINT "                         $H5_CFLAGS"

PRINT_N "                       CPPFLAGS / H5_CPPFLAGS"
PRINT "$CPPFLAGS"
PRINT "                         $H5_CPPFLAGS"

PRINT_N "                        LDFLAGS"
PRINT "$LDFLAGS"

PRINT_N "                     Debug Mode"

if test "X$DEBUG_PKG" = "X$all_packages"; then
  PRINT "All"
elif test "X$DEBUG_PKG" = "X"; then
  PRINT "None"
else
  PRINT $DEBUG_PKG
fi

PRINT_N "               Shared Libraries"
IF_YES_NO "$enable_shared"

PRINT_N "               Static Libraries"
IF_YES_NO "$enable_static"

PRINT_N "  Statically Linked Executables"
IF_YES_NO "$STATIC_EXEC"

PRINT_N "                        Tracing"
IF_YES_NO "$TRACE_API"

PRINT_N "   Optimization Instrumentation"
IF_YES_NO "$INSTRUMENT"

PRINT ""
PRINT "Languages:"
PRINT "----------"

PRINT_N "                            C++"
IF_YES_NO "$HDF_CXX"
if test X$HDF_CXX = Xyes; then
    PRINT_N "                   C++ Compiler"
    PRINT "$CXX"

    PRINT_N "                       CXXFLAGS / H5_CXXFLAGS"
    PRINT "$CXXFLAGS"
    PRINT "                       $H5_CXXFLAGS"
fi

PRINT_N "                        Fortran"
IF_YES_NO "$HDF_FORTRAN"
if test X$HDF_FORTRAN = Xyes; then
    PRINT_N "               Fortran Compiler"
    PRINT "$FC"

    PRINT_N "                         FCFLAGS / H5_FCFLAGS"
    PRINT "$FCFLAGS"
    PRINT "                         $H5_FCFLAGS"
fi

PRINT ""
PRINT "Features:"
PRINT "---------"

PRINT_N "                        dmalloc"
IF_YES_NO "$HAVE_DMALLOC"

PRINT_N "         Function Stack Tracing"
IF_ENABLED_DISABLED "$CODESTACK"

PRINT_N "                 Group Revision"
IF_ENABLED_DISABLED "$GROUPREVISION"

PRINT_N "                           GPFS"
IF_YES_NO "$GPFS"

PRINT_N "        HDF5 v1.6 Compatibility"
IF_YES_NO "$HDF5_V1_6_COMPAT"

PRINT_N "                        hsize_t"
case "$HSIZET" in
  no|small)  PRINT "Small" ;;
  *)         PRINT "Large" ;;
esac

PRINT_N "         I/O filters (external)"
PRINT "$EXTERNAL_FILTERS"

PRINT_N "         I/O filters (internal)"
PRINT "$FILTERS"

PRINT_N " Linux Large File Support (LFS)"
IF_ENABLED_DISABLED "$LINUX_LFS"

PRINT_N "                            MPE"
IF_YES_NO "$MPE"


PRINT_N "                  Parallel HDF5"
if test "$PARALLEL" != "no"; then
  PRINT "Yes"
else
  PRINT "No"
fi


PRINT_N "                     Stream VFD"
IF_ENABLED_DISABLED "$STREAM_VFD"

PRINT_N "                     Direct VFD"
IF_ENABLED_DISABLED "$DIRECT_VFD"

PRINT_N "                   Threadsafety"
IF_ENABLED_DISABLED "$THREADSAFE"

PRINT_N "             High Level library"
IF_ENABLED_DISABLED "$HDF5_HL"