path: root/configure.ac

## Process this file with autoconf to produce configure.
##
## Copyright by The HDF Group.
## All rights reserved.
##
## This file is part of HDF5.  The full HDF5 copyright notice, including
## terms governing use, modification, and redistribution, is contained in
## the COPYING file, which can be found at the root of the source code
## distribution tree, or in https://www.hdfgroup.org/licenses.
## If you do not have access to either file, you may request a copy from
## help@hdfgroup.org.

## ----------------------------------------------------------------------
## Initialize configure.
##
AC_PREREQ([2.71])

## AC_INIT takes the name of the package, the version number, and an
## email address to report bugs. AC_CONFIG_SRCDIR takes a unique file
## as its argument.
##
## NOTE: Do not forget to change the version number here when we do a
## release!!!
##
AC_INIT([HDF5], [1.15.0], [help@hdfgroup.org])

AC_CONFIG_SRCDIR([src/H5.c])
AC_CONFIG_HEADERS([src/H5config.h])

AC_CONFIG_AUX_DIR([bin])
AC_CONFIG_MACRO_DIR([m4])

## AM_INIT_AUTOMAKE takes a list of options that should be applied to
## every Makefile.am when automake is run.
AM_INIT_AUTOMAKE([foreign subdir-objects])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])]) # use silent rules where available - automake 1.11

## AM_MAINTAINER_MODE determines the behavior of "rebuild rules" that contain
## dependencies for Makefile.in files, configure, src/H5config.h, etc. If
## AM_MAINTAINER_MODE is enabled, these files will be rebuilt if out of date.
## When disabled, the autotools build files can get out of sync and the build
## system will not complain or try to regenerate downstream files.
##
## The AM_MAINTAINER_MODE macro also determines whether the
## --(enable|disable)-maintainer-mode configure option is available. When the
## macro is present, with or without a parameter, the option will be added
## to the generated configure script.
##
## In summary:
##
##  AM_MAINTAINER_MODE([enable])
##      - Build dependencies ON by default
##      - Configure option exists
##
##  AM_MAINTAINER_MODE([disable])
##      - Build dependencies OFF by default
##      - Configure option exists
##
##  AM_MAINTAINER_MODE
##      - Build dependencies OFF by default
##      - Configure option exists
##
##  No AM_MAINTAINER_MODE macro
##      - Build dependencies ON by default
##      - No configure option to control build dependencies
##
## The biggest concern for us is that version control systems like git
## usually don't preserve dependencies between timestamps, so the build
## system will often think that upstream build files like Makefile.am are
## dirty and that rebuilding needs to occur when it doesn't. This is a problem
## in release branches where we provide the autotools-generated files. Users
## who don't have autoconf, automake, etc. will then have difficulty building
## release branches checked out from git.
##
## By default, maintainer mode is enabled in development branches and disabled
## in release branches.
AM_MAINTAINER_MODE([enable])

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

## Run post processing on files created by configure
##
## src/H5pubconf.h:
## Generate src/H5pubconf.h from src/H5config.h by prepending H5_ to all
## macro names. This avoid name conflict between HDF5 macro names and those
## generated by another software package that uses the HDF5 library.
##
## src/libhdf5.settings:
## Remove all lines beginning with "#" which are generated by CONDITIONAL's
## of configure.
##
## src/H5build_settings.c
## Remove all lines beginning with "#" which are generated by CONDITIONAL's
## of configure. This uses a check for whitespace after the pound sign
## to avoid clobbering include statements.
AC_CONFIG_COMMANDS([pubconf], [
  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
    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
    mv -f pubconf src/H5pubconf.h
  fi
  echo "Post process src/libhdf5.settings"
  sed '/^#/d' < src/libhdf5.settings > libhdf5.settings.TMP
  cp libhdf5.settings.TMP src/libhdf5.settings
  rm -f libhdf5.settings.TMP
  echo "Post process src/H5build_settings.c"
  sed '/^# /d' < src/H5build_settings.c > H5build_settings.TMP
  cp H5build_settings.TMP src/H5build_settings.c
  rm -f H5build_settings.TMP
])

## It's possible to configure for a host other than the one on which
## configure is currently running by using the --host=foo flag.
## For machines on which HDF5 is often configured, it can be convenient
## to specify the name of the machine rather than its canonical type.
##
## There are currently no hosts, but if there were they would be
## listed by hostname and the alias would point to a file in
## the config directory:
##
##case $host_alias in
##  <some host>)
##    host_alias=<config file in config directory>
##    ;;
##esac

AC_CANONICAL_HOST
AC_SUBST([CPPFLAGS])
AC_SUBST([JNIFLAGS])
AC_SUBST([AR_FLAGS])

## H5_CFLAGS (and company) are for CFLAGS that should be used on HDF5, but
## not exported to h5cc (or h5fc, etc.)
##
AC_SUBST([H5_CFLAGS])
AC_SUBST([H5_CPPFLAGS])
AC_SUBST([H5_FCFLAGS])
AC_SUBST([H5_CXXFLAGS])
AC_SUBST([H5_JNIFLAGS])
AC_SUBST([H5_JAVACFLAGS])
AC_SUBST([H5_JAVAFLAGS])
AC_SUBST([H5_LDFLAGS])

## AM_CFLAGS (and company) are for CFLAGS that should be used on HDF5,
## and WILL be exported to h5cc (or h5fc, etc) if set by configure.
AC_SUBST([AM_CFLAGS])
AC_SUBST([AM_FCFLAGS])
AC_SUBST([AM_CXXFLAGS])
AC_SUBST([AM_CPPFLAGS])
AC_SUBST([AM_JNIFLAGS])
AC_SUBST([AM_JAVACFLAGS])
AC_SUBST([AM_JAVAFLAGS])
AC_SUBST([AM_LDFLAGS])

## Make sure flags are initialized.
AM_CFLAGS="${AM_CFLAGS}"
AM_CXXFLAGS="${AM_CXXFLAGS}"
AM_FCFLAGS="${AM_FCFLAGS}"
AM_CPPFLAGS="${AM_CPPFLAGS}"
AM_JNIFLAGS="${AM_JNIFLAGS}"
AM_JAVACFLAGS="${AM_JAVACFLAGS}"
AM_JAVAFLAGS="${AM_JAVAFLAGS}"
AM_LDFLAGS="${AM_LDFLAGS}"

## Flags passed in by the user
CFLAGS="${CFLAGS}"
CXXFLAGS="${CXXFLAGS}"
FCFLAGS="${FCFLAGS}"
CPPFLAGS="${CPPFLAGS}"
JNIFLAGS="${JNIFLAGS}"
JAVACFLAGS="${JAVACFLAGS}"
JAVAFLAGS="${JAVAFLAGS}"
LDFLAGS="${LDFLAGS}"
AR_FLAGS="${AR_FLAGS}"

## Configure may need to alter any of the *FLAGS variables in order for
## various checks to work correctly. Save the user's value here so it
## can be restored once all configure checks are complete.
saved_user_CFLAGS="$CFLAGS"
saved_user_CXXFLAGS="$CXXFLAGS"
saved_user_FCFLAGS="$FCFLAGS"
saved_user_JAVACFLAGS="$JAVACFLAGS"
saved_user_JAVAFLAGS="$JAVAFLAGS"
saved_user_LDFLAGS="$LDFLAGS"
saved_user_CPPFLAGS="$CPPFLAGS"

## Strip out -Werror from CFLAGS since that can cause checks to fail when
## compiling the test program fails due to warnings
CFLAGS="`echo $CFLAGS | sed -e 's/-Werror//g'`"
CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-Werror//g'`"
FCFLAGS="`echo $FCFLAGS | sed -e 's/-Werror//g'`"
JAVACFLAGS="`echo $JAVACFLAGS | sed -e 's/-Werror//g'`"
CPPFLAGS="`echo $CPPFLAGS | sed -e 's/-Werror//g'`"

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

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

## ----------------------------------------------------------------------
## Save system information for the library settings file.
##
AC_SUBST([UNAME_INFO])
UNAME_INFO=`uname -a`

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

## xargs basename used in configure to get the CC_BASENAME value
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

## ----------------------------------------------------------------------
## Check that the cache file was build on the same host as what we're
## running on now.
##
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
  AC_MSG_ERROR([
     The config.cache file was generated on $hdf5_cv_host but
     this is $host.  Please remove that file and try again.
     config.cache file is invalid])
fi

## ----------------------------------------------------------------------
## Check if we should consider certain compiler warnings as errors
##
## We have to set WARNINGS_AS_ERRORS before sourcing a $host_config
## file, below.
##
## These should NOT be on by default as the risk of breakage is high
## when compiling HDF5 on new (or new versions) of platforms and
## compilers. It can also cause failures when header files we have no
## control over (e.g. MPI, HDFS) raise warnings.
##
AC_MSG_CHECKING([enable warnings as errors])
AC_ARG_ENABLE([warnings-as-errors],
              [AS_HELP_STRING([--enable-warnings-as-errors],
                              [Determines whether certain warnings will be
                               considered errors. This is mainly for use
                               by HDF5 library developers.
                               [default=no]
                               ])],
              [WARNINGS_AS_ERRORS=$enableval])

## Set default
if test "X-$WARNINGS_AS_ERRORS" = X- ; then
  WARNINGS_AS_ERRORS=no
fi

case "X-$WARNINGS_AS_ERRORS" in
  X-yes|X-no)
    AC_MSG_RESULT([$WARNINGS_AS_ERRORS])
    ;;
  *)
    AC_MSG_ERROR([Unrecognized value: $WARNINGS_AS_ERRORS])
    ;;
esac

## ----------------------------------------------------------------------
## Source any special files that we need.  These files normally aren't
## present but can be used by the maintainers to fine tune things like
## turning on debug or profiling flags for the compiler.  The search order
## is:
##
##    CPU-VENDOR-OS
##    VENDOR-OS
##    CPU-OS
##    CPU-VENDOR
##    OS
##    VENDOR
##    CPU
##
## If the `OS' ends with a version number then remove it. For instance,
## `freebsd3.1' would become `freebsd'

case $host_os in
  aix*)
    host_os_novers=aix
    ;;
  freebsd*)
    host_os_novers=freebsd
    ;;
  netbsd*)
    host_os_novers=netbsd
    ;;
  solaris*)
    host_os_novers=solaris
    ;;
  *)
    host_os_novers=$host_os
    ;;
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

## 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

##
## Enable/disable sanitizer checks for clang compilers, initially address sanitizer
##
AC_MSG_CHECKING([for clang sanitizer checks])
AC_ARG_ENABLE([sanitize-checks],
              [AS_HELP_STRING([--enable-sanitize-checks=address],
                              [(clang/clang++ compilers only) Enable sanitize checks.
                               Address is useful for detecting issues dealing with
                               memory. See AddressSanitizer in config/sanitizer/README.md
                               for more information.
                               [default=none]
                               ])],
              [CLANG_SANITIZE_CHECKS=$enableval])

# Set default
if test "X-$CLANG_SANITIZE_CHECKS" = X- ; then
  CLANG_SANITIZE_CHECKS=none
fi

if test "X$CC_BASENAME" = "Xclang"; then
  AC_SUBST([CLANG_SANITIZE_CHECKS])

  # There are several sanitizer tools.  At present we are testing
  # and describing only -fsanitizer=address with autotools.
  case "X-$CLANG_SANITIZE_CHECKS" in
    X-no|X-none)
      CLANG_SANITIZE_CHECKS=none
      CLANG_SANITIZE_LIST=
      ;;
    *)
      CLANG_SANITIZE_LIST=$CLANG_SANITIZE_CHECKS
      ;;
  esac
  AC_MSG_RESULT([$CLANG_SANITIZE_CHECKS])

  # Other tools can be added to the list of checks
  # The clang compiler doesn't support some of them; they should be
  # checked before adding them to the list in the help message.
  # The sanitizers/sanitizers.cmake file lists these options:
  # address, memory, memoryWithOrigins, undefined, thread, leak,
  # 'address;undefined'.  Which and which combinations of these are
  #  supported varies by compiler version, but unsupported options
  # or combinations will result in configure errors reported in config.log.
  # Comma separated lists of sanitize options will be entered intact in
  # one -fsanitize=<list> flag.  Space separated lists will be entered in
  # separate -fsanitize=<item> flags.
  # NOTE: No sanity checking done here!
  if test -n "$CLANG_SANITIZE_LIST"; then
    H5_CFLAGS="$H5_CFLAGS -fno-omit-frame-pointer"
    H5_CXXFLAGS="$H5_CXXFLAGS -fno-omit-frame-pointer"
    for sanitizer in `echo $CLANG_SANITIZE_LIST`; do
      H5_CFLAGS="$H5_CFLAGS -fsanitize=${sanitizer}"
      H5_CXXFLAGS="$H5_CXXFLAGS -fsanitize=${sanitizer}"
    done
  fi
fi

## ----------------------------------------------------------------------
## Determine build mode (debug, production, clean).
## This has to be done early since the build mode is referred to
## frequently.
##
AC_MSG_CHECKING([build mode])
AC_ARG_ENABLE([build-mode],
              [AS_HELP_STRING([--enable-build-mode=(debug|production|clean)],
                              [Sets the build mode. Debug turns on symbols, API
                               tracing, asserts, and debug optimization,
                               as well as several other minor configure options
                               that aid in debugging.
                               Production turns high optimizations on.
                               Clean turns nothing on and disables optimization
                               (i.e.: a 'clean slate' configuration).
                               All these settings can be overridden by using
                               specific configure flags.
                               [default=debug]
                               ])],
              [BUILD_MODE=$enableval])

## Set the default
## Depends on branch, set via script at branch creation time
if test "X-$BUILD_MODE" = X- ; then
    BUILD_MODE=debug
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([BUILD_MODE])

case "X-$BUILD_MODE" in
  X-clean)
    AC_MSG_RESULT([clean])
    ;;
  X-debug)
    AC_DEFINE([DEBUG_BUILD], [1], [Define if this is a debug build.])
    H5_CFLAGS="$H5_CFLAGS $DEBUG_CFLAGS"
    H5_CPPFLAGS="$H5_CPPFLAGS $DEBUG_CPPFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $DEBUG_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $DEBUG_FCFLAGS"
    AC_MSG_RESULT([debug])
    ;;
  X-production)
    H5_CFLAGS="$H5_CFLAGS $PROD_CFLAGS"
    H5_CPPFLAGS="$H5_CPPFLAGS $PROD_CPPFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $PROD_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $PROD_FCFLAGS"
    AC_MSG_RESULT([production])
    ;;
  *)
    AC_MSG_ERROR([Unrecognized build mode: $BUILD_MODE. Use debug, production, or clean.])
esac

## ----------------------------------------------------------------------
## Some built-in configure checks can only see CFLAGS (not AM_CFLAGS), so
## we need to add this in so configure works as intended. We will need to
## reset this value at the end of configure, to preserve the user's settings.
CFLAGS="${AM_CFLAGS} ${CFLAGS}"
FCFLAGS="${AM_FCFLAGS} ${FCFLAGS}"
JAVACFLAGS="${AM_JAVACFLAGS} ${JAVACFLAGS}"
JAVAFLAGS="${AM_JAVAFLAGS} ${JAVAFLAGS}"
CXXFLAGS="${AM_CXXFLAGS} ${CXXFLAGS}"
CPPFLAGS="${AM_CPPFLAGS} ${CPPFLAGS}"
LDFLAGS="${AM_LDFLAGS} ${LDFLAGS}"

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

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

## ----------------------------------------------------------------------------
## Configure disallows unsupported combinations of options. However, users
## may want to override and build with unsupported combinations for their
## own use. They can use the --enable-unsupported configure flag, which
## ignores any errors from configure due to incompatible flags.
AC_MSG_CHECKING([if unsupported combinations of configure options are allowed])
AC_ARG_ENABLE([unsupported],
              [AS_HELP_STRING([--enable-unsupported],
                              [Allow unsupported combinations of configure options])],
              [ALLOW_UNSUPPORTED=$enableval])

case "X-$ALLOW_UNSUPPORTED" in
  X-|X-no)
    AC_MSG_RESULT([no])
    ;;
  X-yes)
    AC_MSG_RESULT([yes])
    ;;
  *)
    ;;
esac

## ----------------------------------------------------------------------
## Data types and their sizes.
##
AC_TYPE_OFF_T
AC_CHECK_TYPE([ssize_t], [],
        [AC_DEFINE_UNQUOTED([ssize_t], [long],
                [Define to `long' if <sys/types.h> does not define.])])
AC_C_BIGENDIAN
AC_CHECK_SIZEOF([char])
AC_CHECK_SIZEOF([short])
AC_CHECK_SIZEOF([int])
AC_CHECK_SIZEOF([unsigned])
AC_CHECK_SIZEOF([long])
AC_CHECK_SIZEOF([long long])
AC_CHECK_SIZEOF([float])
AC_CHECK_SIZEOF([double])
AC_CHECK_SIZEOF([long double])

## ----------------------------------------------------------------------
## Check if _Float16 support is available
##
AC_MSG_NOTICE([checking if _Float16 support is available])
HAVE__FLOAT16="no"
AC_CHECK_SIZEOF([_Float16])
if test "$ac_cv_sizeof__Float16" != 0; then
  # Some compilers expose the _Float16 datatype, but not the macros and
  # functions used with the datatype. We need the macros for proper
  # datatype conversion support. Check for these here.
  AC_CHECK_DECL([FLT16_EPSILON], [], [], [[
                 #define __STDC_WANT_IEC_60559_TYPES_EXT__
                 #include <float.h>]])
  AC_CHECK_DECL([FLT16_MIN], [], [], [[
                 #define __STDC_WANT_IEC_60559_TYPES_EXT__
                 #include <float.h>]])
  AC_CHECK_DECL([FLT16_MAX], [], [], [[
                 #define __STDC_WANT_IEC_60559_TYPES_EXT__
                 #include <float.h>]])
  AC_CHECK_DECL([FLT16_MIN_10_EXP], [], [], [[
                 #define __STDC_WANT_IEC_60559_TYPES_EXT__
                 #include <float.h>]])
  AC_CHECK_DECL([FLT16_MAX_10_EXP], [], [], [[
                 #define __STDC_WANT_IEC_60559_TYPES_EXT__
                 #include <float.h>]])
  AC_CHECK_DECL([FLT16_MANT_DIG], [], [], [[
                 #define __STDC_WANT_IEC_60559_TYPES_EXT__
                 #include <float.h>]])

  if test "X$ac_cv_have_decl_FLT16_EPSILON" = "Xyes" &&
     test "X$ac_cv_have_decl_FLT16_MIN" = "Xyes" &&
     test "X$ac_cv_have_decl_FLT16_MAX" = "Xyes" &&
     test "X$ac_cv_have_decl_FLT16_MIN_10_EXP" = "Xyes" &&
     test "X$ac_cv_have_decl_FLT16_MAX_10_EXP" = "Xyes" &&
     test "X$ac_cv_have_decl_FLT16_MANT_DIG" = "Xyes" ; then
    # Some compilers like OneAPI on Windows appear to detect _Float16 support
    # properly up to this point, and, in the absence of any architecture-specific
    # tuning compiler flags, will generate code for H5Tconv.c that performs
    # software conversions on _Float16 variables with compiler-internal functions
    # such as __extendhfsf2, __truncsfhf2, or __truncdfhf2. However, these
    # compilers will fail to link these functions into the build for currently
    # unknown reasons and cause the build to fail. Since these are compiler-internal
    # functions that we don't appear to have much control over, let's try to
    # compile a program that will generate these functions to check for _Float16
    # support. If we fail to compile this program, we will simply disable
    # _Float16 support for the time being.
    AC_MSG_CHECKING([if compiler can correctly compile and run a test program which converts _Float16 to other types with casts])
    TEST_SRC="`(echo \"#define H5_FLOAT16_CONVERSION_FUNCS_LINK_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
    AC_CACHE_VAL([hdf5_cv_float16_conversion_funcs_link],
    [AC_RUN_IFELSE(
        [AC_LANG_SOURCE([$TEST_SRC])],
        [hdf5_cv_float16_conversion_funcs_link=yes], [hdf5_cv_float16_conversion_funcs_link=no], [hdf5_cv_float16_conversion_funcs_link=no])])

    if test ${hdf5_cv_float16_conversion_funcs_link} = "yes"; then
      AC_MSG_RESULT([yes])

      # Finally, MacOS 13 appears to have a bug specifically when converting
      # long double values to _Float16. Release builds of the dt_arith test
      # would cause any assignments to a _Float16 variable to be elided,
      # whereas Debug builds would perform incorrect hardware conversions by
      # simply chopping off all the bytes of the value except for the first 2.
      # These tests pass on MacOS 14, so let's perform a quick test to check
      # if the hardware conversion is done correctly.
      AC_MSG_CHECKING([if compiler can correctly convert long double values to _Float16])
      TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_FLOAT16_CORRECT_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
      if test ${ac_cv_sizeof_long_double} = 0; then
        hdf5_cv_ldouble_to_float16_correct=${hdf5_cv_ldouble_to_float16_correct=no}
      else
        AC_CACHE_VAL([hdf5_cv_ldouble_to_float16_correct],
        [AC_RUN_IFELSE(
            [AC_LANG_SOURCE([$TEST_SRC])],
            [hdf5_cv_ldouble_to_float16_correct=yes], [hdf5_cv_ldouble_to_float16_correct=no], [hdf5_cv_ldouble_to_float16_correct=yes])])
      fi

      if test ${hdf5_cv_ldouble_to_float16_correct} = "yes"; then
        AC_DEFINE([LDOUBLE_TO_FLOAT16_CORRECT], [1],
          [Define if your system can convert long double to _Float16 values correctly.])
        AC_MSG_RESULT([yes])
      else
        AC_MSG_RESULT([no])
        AC_MSG_NOTICE([Conversions from long double to _Float16 appear to be incorrect. These will be emulated through a soft conversion function.])
      fi

      HAVE__FLOAT16="yes"

      # Check if we can use fabsf16
      AC_CHECK_FUNC([fabsf16], [AC_DEFINE([HAVE_FABSF16], [1],
                        [Define if has fabsf16 function])], [])

      # Define HAVE__FLOAT16 macro for H5pubconf.h if _Float16 is available.
      AC_DEFINE([HAVE__FLOAT16], [1], [Determine if _Float16 is available])
    else
      AC_MSG_RESULT([no])
    fi
  fi

  AC_MSG_CHECKING([if _Float16 support is enabled])
  AC_MSG_RESULT([$HAVE__FLOAT16])
fi

# Define HAVE__FLOAT16 value to substitute into other files for conditional testing
AC_SUBST([HAVE__FLOAT16])

## ----------------------------------------------------------------------
## Check if the Fortran interface should be enabled
##

## This needs to be exposed for the library info file even if Fortran is disabled.
AC_SUBST([HDF_FORTRAN])

## Default is no Fortran
HDF_FORTRAN=no

AC_SUBST([HDF5_INTERFACES]) HDF5_INTERFACES=""
AC_MSG_CHECKING([if Fortran interface enabled])
AC_ARG_ENABLE([fortran],
              [AS_HELP_STRING([--enable-fortran],
                              [Compile the Fortran interface [default=no]])],
              [HDF_FORTRAN=$enableval])

AC_MSG_RESULT([$HDF_FORTRAN])

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

## ----------------------------------------------------------------------
## Check for non-standard extension __FLOAT128
##
  HAVE_FLOAT128=0
  HAVE_QUADMATH=0
  FLT128_DIG=0
  LDBL_DIG=0

  AC_CHECK_SIZEOF([__float128])
  AC_CHECK_SIZEOF([_Quad])
  AC_CHECK_HEADERS([quadmath.h], [HAVE_QUADMATH=1], [])
  PAC_FC_LDBL_DIG

  AC_SUBST([PAC_C_MAX_REAL_PRECISION])

  if test "$ac_cv_sizeof___float128" != 0 && test "$FLT128_DIG" != 0 ; then
    AC_DEFINE([HAVE_FLOAT128], [1], [Determine if __float128 is available])
    PAC_C_MAX_REAL_PRECISION=$FLT128_DIG
  else
    PAC_C_MAX_REAL_PRECISION=$LDBL_DIG
  fi
  AC_DEFINE_UNQUOTED([PAC_C_MAX_REAL_PRECISION], $PAC_C_MAX_REAL_PRECISION, [Determine the maximum decimal precision in C])
  AC_MSG_RESULT([$PAC_C_MAX_REAL_PRECISION])

  VERS_MAJOR=`cat $srcdir/src/H5public.h | sed -n 's/^#define H5_VERS_MAJOR //p'`
  VERS_MINOR=`cat $srcdir/src/H5public.h | sed -n 's/^#define H5_VERS_MINOR //p'`
  VERS_RELEASE=`cat $srcdir/src/H5public.h | sed -n 's/^#define H5_VERS_RELEASE //p'`
  AC_DEFINE_UNQUOTED([VERS_MAJOR_TMP], $VERS_MAJOR, [Define major library version])
  AC_DEFINE_UNQUOTED([VERS_MINOR_TMP], $VERS_MINOR, [Define minor library version])
  AC_DEFINE_UNQUOTED([VERS_RELEASE_TMP], $VERS_RELEASE, [Define release library version])

## We will output an include file for Fortran, H5config_f.inc which
## contains various configure definitions used by the Fortran Library.
## Prepend H5_ to all macro names. This avoids name conflict between HDF5 macro
## names and those generated by another software package that uses the HDF5 library.
  AC_CONFIG_HEADERS([fortran/src/H5config_f.inc],
    [cat fortran/src/H5config_f.inc | sed '1d;s%^/\* \(.*\) \*/%\1%;s/#define /#define H5_/;s/#undef /#undef H5_/' >fortran/src/H5config_f.inc.tmp; sed -i 's\_TMP\\g' fortran/src/H5config_f.inc.tmp; mv -f fortran/src/H5config_f.inc.tmp fortran/src/H5config_f.inc])

  AC_SUBST([FC])

  HDF5_INTERFACES="$HDF5_INTERFACES fortran"

  ## --------------------------------------------------------------------
  ## HDF5 integer variables for the H5fortran_types.f90 file.
  ##
  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])

  ## --------------------------------------------------------------------
  ## Fortran source extension
  ##
  AC_FC_SRCEXT([f90])

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

  ## --------------------------------------------------------------------
  ## Check for a Fortran compiler and how to include modules.
  ##
  AC_PROG_FC([PAC_FC_SEARCH_LIST],)
  AC_F9X_MODS

  ## Allow setting the fortran module install dir
  AC_ARG_WITH([fmoddir],
    [AS_HELP_STRING([--with-fmoddir=DIR], [Fortran module install directory])],
    [fmoddir=$withval],
    [fmoddir="\${includedir}"])
  AC_SUBST([fmoddir], [$fmoddir])

  ## Change to the Fortran 90 language
  AC_LANG_PUSH(Fortran)

  ## Checking if the compiler supports the required Fortran 2003 features and
  ## stopping if it does not.
  PAC_PROG_FC_HAVE_F2003_REQUIREMENTS

  if test "X$HAVE_F2003_REQUIREMENTS" = "Xno"; then
    AC_MSG_ERROR([Fortran compiler lacks required Fortran 2003 features; unsupported Fortran 2003 compiler, remove --enable-fortran])
  fi
  ## Checking if the compiler supports fortran character being allocatable
  PAC_HAVE_CHAR_ALLOC

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

  ## --------------------------------------------------------------------
  ## See if the fortran compiler supports the intrinsic function "SIZEOF"
  PAC_PROG_FC_SIZEOF

  ## See if the fortran compiler supports the intrinsic function "C_SIZEOF"
  PAC_PROG_FC_C_SIZEOF

  ## See if the fortran compiler supports the intrinsic function "STORAGE_SIZE"
  PAC_PROG_FC_STORAGE_SIZE

  ## Set the sizeof function for use later in the fortran tests
  if test "X$HAVE_STORAGE_SIZE_FORTRAN" = "Xyes";then
    FC_SIZEOF_A="STORAGE_SIZE(a, c_size_t)/STORAGE_SIZE(c_char_'a',c_size_t)"
    FC_SIZEOF_B="STORAGE_SIZE(b, c_size_t)/STORAGE_SIZE(c_char_'a',c_size_t)"
    FC_SIZEOF_C="STORAGE_SIZE(c, c_size_t)/STORAGE_SIZE(c_char_'a',c_size_t)"
  else
    if test "X$HAVE_SIZEOF_FORTRAN" = "Xyes";then
      FC_SIZEOF_A="SIZEOF(a)"
      FC_SIZEOF_B="SIZEOF(b)"
      FC_SIZEOF_C="SIZEOF(c)"
    else
      ## If neither intrinsic functions SIZEOF or STORAGE_SIZE is available then stop configure with an error
      AC_MSG_ERROR([Fortran compiler requires either intrinsic functions SIZEOF or STORAGE_SIZE])
    fi
  fi

  ## See if the fortran compiler supports the intrinsic module "ISO_FORTRAN_ENV"
  PAC_PROG_FC_ISO_FORTRAN_ENV
  ## Check KIND and size of native integer
  PAC_FC_NATIVE_INTEGER

  ## Find all available KINDs
  PAC_FC_AVAIL_KINDS
  ## Find all sizeofs for available KINDs
  PAC_FC_SIZEOF_INT_KINDS
  PAC_FC_SIZEOF_REAL_KINDS

  AC_SUBST([PAC_FC_ALL_REAL_KINDS])
  AC_SUBST([PAC_FC_MAX_REAL_PRECISION])
  AC_SUBST([PAC_FORTRAN_NUM_INTEGER_KINDS])
  AC_SUBST([PAC_FC_ALL_INTEGER_KINDS])
  AC_SUBST([PAC_FC_ALL_REAL_KINDS_SIZEOF])
  AC_SUBST([PAC_FC_ALL_INTEGER_KINDS_SIZEOF])
  AC_SUBST([PAC_FORTRAN_NATIVE_INTEGER_KIND])
  AC_SUBST([PAC_FORTRAN_NATIVE_INTEGER_SIZEOF])
  AC_SUBST([PAC_FORTRAN_NATIVE_REAL_KIND])
  AC_SUBST([PAC_FORTRAN_NATIVE_REAL_SIZEOF])
  AC_SUBST([PAC_FORTRAN_NATIVE_DOUBLE_KIND])
  AC_SUBST([PAC_FORTRAN_NATIVE_DOUBLE_SIZEOF])
  AC_SUBST([HAVE_Fortran_INTEGER_SIZEOF_16])
  AC_SUBST([FORTRAN_HAVE_C_LONG_DOUBLE])
  AC_SUBST([FORTRAN_C_LONG_DOUBLE_IS_UNIQUE])
  AC_SUBST([FORTRAN_C_BOOL_IS_UNIQUE])
  AC_SUBST([H5CONFIG_F_NUM_RKIND])
  AC_SUBST([H5CONFIG_F_RKIND])
  AC_SUBST([H5CONFIG_F_RKIND_SIZEOF])
  AC_SUBST([H5CONFIG_F_NUM_IKIND])
  AC_SUBST([H5CONFIG_F_IKIND])
  AC_SUBST([Fortran_COMPILER_ID])
  Fortran_COMPILER_ID=none
  AC_DEFINE_UNQUOTED([Fortran_COMPILER_ID], $Fortran_COMPILER_ID, [Define Fortran compiler ID])

  ## Setting definition if there is a 16 byte fortran integer
  if `echo $PAC_FC_ALL_INTEGER_KINDS_SIZEOF | grep '16' >/dev/null`; then
    HAVE_Fortran_INTEGER_SIZEOF_16="1"
    AC_DEFINE([HAVE_Fortran_INTEGER_SIZEOF_16], [1], [Determine if INTEGER*16 is available])
  else
    HAVE_Fortran_INTEGER_SIZEOF_16="0"
    AC_DEFINE([HAVE_Fortran_INTEGER_SIZEOF_16], [0], [Determine if INTEGER*16 is available])
  fi

  if test "X$HAVE_STORAGE_SIZE_FORTRAN" = "Xyes"; then
    AC_DEFINE([FORTRAN_HAVE_STORAGE_SIZE], [1], [Define if we have Fortran intrinsic STORAGE_SIZE])
  fi

  if test "X$HAVE_C_SIZEOF_FORTRAN" = "Xyes"; then
    AC_DEFINE([FORTRAN_HAVE_C_SIZEOF], [1], [Define if we have Fortran intrinsic C_SIZEOF])
  fi

  if test "X$HAVE_SIZEOF_FORTRAN" = "Xyes"; then
    AC_DEFINE([FORTRAN_HAVE_SIZEOF], [1], [Define if we have Fortran intrinsic SIZEOF])
  fi

  if test "X$HAVE_CHAR_ALLOC_FORTRAN" = "Xyes"; then
    AC_DEFINE([FORTRAN_HAVE_CHAR_ALLOC], [1], [Define if Fortran supports allocatable character])
  fi

  ## See if C_LONG_DOUBLE is available
  PAC_PROG_FC_HAVE_C_LONG_DOUBLE

  FORTRAN_HAVE_C_LONG_DOUBLE="0"
  if test "X$HAVE_C_LONG_DOUBLE_FORTRAN" = "Xyes"; then
    FORTRAN_HAVE_C_LONG_DOUBLE="1"
    AC_DEFINE([FORTRAN_HAVE_C_LONG_DOUBLE], [1], [Define if we have Fortran C_LONG_DOUBLE])
  fi

  ## Is C_LONG_DOUBLE different from C_DOUBLE
  FORTRAN_C_LONG_DOUBLE_IS_UNIQUE="0"
  if test "$FORTRAN_HAVE_C_LONG_DOUBLE" = "1"; then
    PAC_PROG_FC_C_LONG_DOUBLE_EQ_C_DOUBLE
    if test "X$C_LONG_DOUBLE_IS_UNIQUE_FORTRAN" = "Xyes"; then
      FORTRAN_C_LONG_DOUBLE_IS_UNIQUE="1"
      AC_DEFINE([FORTRAN_C_LONG_DOUBLE_IS_UNIQUE], [1], [Define if Fortran C_LONG_DOUBLE is different from C_DOUBLE])
    else
      FORTRAN_C_LONG_DOUBLE_IS_UNIQUE="0"
    fi
  fi

  ## Is C_BOOL different from default LOGICAL
  FORTRAN_C_BOOL_IS_UNIQUE="0"
  PAC_PROG_FC_C_BOOL_EQ_LOGICAL
  if test "X$C_BOOL_IS_UNIQUE_FORTRAN" = "Xyes"; then
    FORTRAN_C_BOOL_IS_UNIQUE="1"
    AC_DEFINE([FORTRAN_C_BOOL_IS_UNIQUE], [1], [Define if Fortran C_BOOL is different from default LOGICAL])
  else
    FORTRAN_C_BOOL_IS_UNIQUE="0"
  fi

  FORTRAN_SIZEOF_LONG_DOUBLE=${ac_cv_sizeof_long_double}
  AC_DEFINE_UNQUOTED([FORTRAN_SIZEOF_LONG_DOUBLE], ["${ac_cv_sizeof_long_double}"], [Determine the size of C long double])

  dnl get the largest sizeof for REAL kinds
  max_real_fortran_sizeof="`echo $PAC_FC_ALL_REAL_KINDS_SIZEOF | sed -ne 's/.*,\([[0-9]]*\)}/\1/p'`"
  max_real_fortran_kind="`echo $PAC_FC_ALL_REAL_KINDS | sed -ne 's/.*,\([[0-9]]*\)}/\1/p'`"

  dnl remove the invalid kind from the list
  if test "$ac_cv_sizeof___float128" != 0;then
    if test "$ac_cv_sizeof___float128" != "$max_real_fortran_sizeof" &&
       test "${ac_cv_sizeof_long_double}" != "$max_real_fortran_sizeof" &&
       dnl account for the fact that the C compiler can have 16-byte __float128 and the Fortran compiler only has 8-byte doubles,
       dnl so we don't want to remove the 8-byte Fortran doubles. This is sometimes the case if different C and Fortran vendors
       dnl are used (for example gnu and pgi).
       test "${ac_cv_sizeof_double}" != "$max_real_fortran_sizeof" ; then
          AC_MSG_WARN([
           Fortran REAL(KIND=$max_real_fortran_kind) is $max_real_fortran_sizeof Bytes, but no corresponding C float type exists of that size
                     !!! Fortran interfaces will not be generated for REAL(KIND=$max_real_fortran_kind) !!!
          ])
      PAC_FC_ALL_REAL_KINDS="`echo $PAC_FC_ALL_REAL_KINDS | sed -e 's/,[[0-9]]\+}/}/g'`"
      PAC_FC_ALL_REAL_KINDS_SIZEOF="`echo $PAC_FC_ALL_REAL_KINDS_SIZEOF | sed -e 's/,[[0-9]]\+}/}/g'`"

    fi
  fi
  AC_MSG_CHECKING([for Fortran interoperable KINDS with C])
  AC_MSG_RESULT([$PAC_FC_ALL_REAL_KINDS])

  dnl count the number of real kinds
  H5CONFIG_F_NUM_RKIND="INTEGER, PARAMETER :: num_rkinds = `echo \"[$]PAC_FC_ALL_REAL_KINDS\" |  tr -d -c ',\n' | awk '{ print length + 1; }'`"
  H5CONFIG_F_RKIND="INTEGER, DIMENSION(1:num_rkinds) :: rkind = (/`echo $PAC_FC_ALL_REAL_KINDS | sed -e 's/{//g' | sed -e 's/}//g' | sed -e 's/ /,/g'`/)"
  H5CONFIG_F_RKIND_SIZEOF="INTEGER, DIMENSION(1:num_rkinds) :: rkind_sizeof = (/`echo $PAC_FC_ALL_REAL_KINDS_SIZEOF | sed -e 's/{//g' | sed -e 's/}//g'| sed -e 's/ /,/g'`/)"

  AC_DEFINE_UNQUOTED([H5CONFIG_F_NUM_RKIND], $H5CONFIG_F_NUM_RKIND, [Define number of valid Fortran REAL KINDs])
  AC_DEFINE_UNQUOTED([H5CONFIG_F_RKIND], $H5CONFIG_F_RKIND, [Define valid Fortran REAL KINDs])
  AC_DEFINE_UNQUOTED([H5CONFIG_F_RKIND_SIZEOF], $H5CONFIG_F_RKIND_SIZEOF, [Define valid Fortran REAL KINDs Sizeof])

## Change back to the C language
  AC_LANG_POP(Fortran)
else
  FC="no"
fi

## ----------------------------------------------------------------------
## Check if they would like the C++ interface compiled
##
## This needs to be exposed for the library info file even if C++ is disabled.
AC_SUBST([HDF_CXX])

## Default is no C++
HDF_CXX=no

## We need to check for a C++ compiler unconditionally, since
## AC_PROG_CXX defines some macros that Automake 1.9.x uses and will
## miss even if c++ is not enabled.
AC_PROG_CXX
AC_PROG_CXXCPP

AC_MSG_CHECKING([if c++ interface enabled])

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

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

  ## Expose the compiler for *.in files
  AC_SUBST([CXX])

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

else
  CXX="no"
fi

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


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

## This needs to be exposed for the library info file even if the HL
## library is disabled.
AC_SUBST([HDF5_HL])
AC_SUBST([HDF5_HL_TOOLS])
AC_SUBST([HDF5_HL_GIF_TOOLS])

## The high-level library and high-level tools are enabled unless the build mode
## is clean.
if test "X-$BUILD_MODE" = "X-clean" ; then
  HDF5_HL=no
  HDF5_HL_TOOLS=no
else
  HDF5_HL=yes
  HDF5_HL_TOOLS=yes
fi

## high-level library directories (set when needed, blank until then)
##
## main high-level library
AC_SUBST(HL)
HL=""
## Fortran high-level library
AC_SUBST(HL_FOR)
HL_FOR=""
## Tools high-level library
AC_SUBST(HL_TOOLS)
HL_TOOLS=""

AC_MSG_CHECKING([if the high-level library is enabled])
AC_ARG_ENABLE([hl],
     [AS_HELP_STRING([--enable-hl],
                     [Enable the high-level library.
                     [default=yes (unless build mode = clean)]
                     ])],
     [HDF5_HL=$enableval])

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

## ----------------------------------------------------------------------
## Enable new references for dimension scales
##
AC_SUBST([DIMENSION_SCALES_WITH_NEW_REF])
AC_MSG_CHECKING([whether to use new references with dimension scales]);
AC_ARG_ENABLE([dimension-scales-with-new-ref],
              [AS_HELP_STRING([--enable-dimension-scales-with-new-ref],
                     [Use new references when creating dimension scales.
                      [default=no]
                     ])],
             [DIMENSION_SCALES_WITH_NEW_REF=$enableval])

## Set the default value to use old references.
if test "X-$DIMENSION_SCALES_WITH_NEW_REF" = X- ; then
  DIMENSION_SCALES_WITH_NEW_REF=no
fi

case "X-$DIMENSION_SCALES_WITH_NEW_REF" in
  X-yes)
    AC_MSG_RESULT([yes])
    AC_DEFINE([DIMENSION_SCALES_WITH_NEW_REF], [1],
              [Define if new references for dimension scales were requested])

    ;;
  X-no)
    AC_MSG_RESULT([no])
    ;;
  *)
    AC_MSG_ERROR([Unrecognized value: $DIMENSION_SCALES_WITH_NEW_REF])
    ;;
esac

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

# Set the default ar flags to cr
# The Automake default is to use cru and the 'u' causes ar
# to emit warnings on some platforms.
AR_FLAGS=cr


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

AC_PROG_MAKE_SET
AC_PROG_INSTALL


## ----------------------------------------------------------------------
## Set up ${TR} which is used to process the package list for extra
## debugging output in the C library.

AC_PATH_PROG([TR], [tr])


## ----------------------------------------------------------------------
## Check that time can be used with srcdir.  This is okay on most systems,
## but seems to cause problems on Cygwin.
## The solution on Cygwin is not to record execution time for tests.
##
## Note: This is still true as of Cygwin 1.7.32 (Aug 2014) on both 32-
## and 64-bit platforms. Given how long this has been true, it seems
## unlikely to change, but we should probably re-test this periodically.

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


## The following variables are used to distinguish between building a
## serial and parallel library.
##
##    HAVE_PARALLEL    -- defined in H5config.h if we are building
##               a parallel library even if configure wasn't
##               able to find some header file or library that
##               might be required. This is defined if the
##               user explicitly states
##               that a parallel library is being built by supplying
##               the `--enable-parallel' configure switch.
##
##    PARALLEL        -- This variable is set to a non-null value if
##               we're building a parallel version of the library.
##
##    RUNSERIAL            -- This is a command which will be prepended to
##               the executable name to run the executable using
##               a single process. For serial versions of the
##               library this will normally be empty. For parallel
##               versions it might be something like `mpiexec -n 1'.
##               The value of this variable is substituted in *.in
##               files.
##
##    RUNPARALLEL    -- This is a command which will be prepended to
##               the executable name to run the executable on
##               multiple processors. For the serial library the
##               value will normally be the empty string. For
##               parallel library it should be something like
##               "mpiexec -n \$\${NPROCS:=6}" where NPROCS will
##               eventually contain the number of processors on which
##               to run the executable (the double dollarsigns are to
##               protect the expansion until make executes the
##               command).  The value of this variable is
##               substituted in *.in files.
##
AC_SUBST([PARALLEL])
AC_SUBST([RUNSERIAL])
AC_SUBST([RUNPARALLEL])
AC_SUBST([TESTPARALLEL])

## ----------------------------------------------------------------------
## Check if they would like the Java native interface (JNI) compiled
##

## This needs to be exposed for the library info file even if Java is disabled.
AC_SUBST([HDF_JAVA])

## Default is no Java
HDF_JAVA=no

AC_SUBST([H5_CLASSPATH]) H5_CLASSPATH=""
AC_MSG_CHECKING([if Java JNI interface enabled])

AC_ARG_ENABLE([java],
              [AS_HELP_STRING([--enable-java],
                              [Compile the Java JNI interface [default=no]])],
              [HDF_JAVA=$enableval])

if test "X$HDF_JAVA" = "Xyes"; then
  if test "X${enable_shared}" != "Xno"; then
    AC_MSG_RESULT([yes])
    if test "X$CLASSPATH" = "X"; then
      H5_CLASSPATH=".:$srcdir/java/lib"
    else
      H5_CLASSPATH=".:$CLASSPATH:$srcdir/java/lib"
    fi
    ## Checks for programs.
    AX_JAVA_OPTIONS
    H5_JAVACFLAGS=$JAVACFLAGS
    H5_JAVAFLAGS=$JAVAFLAGS
    AX_PROG_JAVAC
    AX_PROG_JAVA
    AX_PROG_JAR
    AX_PROG_JAVADOC
    ## Find the include directories needed for building JNI code
    AX_JNI_INCLUDE_DIR()
    for JNI_INCLUDE_DIR in $JNI_INCLUDE_DIRS
    do
      JNIFLAGS="$JNIFLAGS -I$JNI_INCLUDE_DIR"
    done
    ## Find junit for testing the JNI code
    AX_CHECK_CLASSPATH()
    CLASSPATH_ENV=$H5_CLASSPATH
    AX_CHECK_JUNIT()
    AX_CHECK_JAVA_HOME

    AC_MSG_RESULT([yes])
  else
    AC_MSG_ERROR([Java requires shared libraries to be built])
    HDF_JAVA="no"
    AC_MSG_RESULT([no])
  fi
else
  AC_MSG_RESULT([no])
fi

## ----------------------------------------------------------------------
## Fortran libraries are not currently supported on Mac. Disable them.
## (this is overridable with --enable-unsupported).
##
AC_SUBST([H5_FORTRAN_SHARED])
H5_FORTRAN_SHARED="no"
if test "X${HDF_FORTRAN}" = "Xyes" && test "X${enable_shared}" != "Xno"; then
  AC_MSG_CHECKING([if shared Fortran libraries are supported])
  H5_FORTRAN_SHARED="yes"

  ## Report results of check(s)

  if test "X${H5_FORTRAN_SHARED}" = "Xno"; then
    AC_MSG_RESULT([no])
    AC_MSG_WARN([$CHECK_WARN])
    if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
      AC_MSG_WARN([Disabling shared Fortran libraries.])
      AC_MSG_WARN([To override this behavior, please use --enable-unsupported configure option.])
        if test "X${enable_static}" = "Xno"; then
          AC_MSG_ERROR([both static and shared Fortran libraries are disabled])
        fi
    else
      AC_MSG_WARN([Allowing unsupported Fortran shared libraries due to use of --enable-unsupported flag])
      H5_FORTRAN_SHARED="yes"
    fi
  else
    AC_MSG_RESULT([yes])
  fi
fi

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

## ----------------------------------------------------------------------
## Check if they would like to disable building tests
##

## This needs to be exposed for the library info file.
AC_SUBST([HDF5_TESTS])

## Default is to build tests
HDF5_TESTS=yes

AC_MSG_CHECKING([if building tests is disabled])

AC_ARG_ENABLE([tests],
              [AS_HELP_STRING([--enable-tests],
                              [Compile the HDF5 tests [default=yes]])],
              [HDF5_TESTS=$enableval])

AC_MSG_RESULT([$HDF5_TESTS])

## These need to be exposed for some tests.
AC_SUBST([H5_UTILS_TEST_BUILDDIR])
H5_UTILS_TEST_BUILDDIR='utils/test'
AC_SUBST([H5_TEST_BUILDDIR])
H5_TEST_BUILDDIR='test'

## ----------------------------------------------------------------------
## Check what level of testing should be enabled
##

## Default is quickest testing
TEST_EXPRESS_LEVEL_DEFAULT=3

AC_MSG_CHECKING([if HDF5 testing intensity level is set])

AC_ARG_ENABLE([test-express],
              [AS_HELP_STRING([--enable-test-express=(0-3)],
                              [Set HDF5 testing intensity level (0-3) [0 = exhaustive testing; 3 = quicker testing; default=3] Set environment variable HDF5TestExpress to override configured setting])],
              [TEST_EXPRESS_LEVEL_DEFAULT=$enableval])

case "X-$TEST_EXPRESS_LEVEL_DEFAULT" in
  X-0|X-1|X-2|X-3)
    AC_MSG_RESULT([$TEST_EXPRESS_LEVEL_DEFAULT])
    ;;
  *)
    AC_MSG_RESULT([error])
    AC_MSG_ERROR([$TEST_EXPRESS_LEVEL_DEFAULT is not a valid test express level])
    ;;
esac

AC_DEFINE_UNQUOTED([TEST_EXPRESS_LEVEL_DEFAULT], [$TEST_EXPRESS_LEVEL_DEFAULT], [HDF5 testing intensity level])

## ----------------------------------------------------------------------
## Check if they would like to disable building tools
##

## This needs to be exposed for the library info file.
AC_SUBST([HDF5_TOOLS])

## Default is to build tests and tools
HDF5_TOOLS=yes

AC_MSG_CHECKING([if building tools is enabled])

AC_ARG_ENABLE([tools],
              [AS_HELP_STRING([--enable-tools],
                              [Compile the HDF5 tools [default=yes]])],
              [HDF5_TOOLS=$enableval])

AC_MSG_RESULT([$HDF5_TOOLS])

## ----------------------------------------------------------------------
## Check if they would like to disable building the high-level GIF
## tools (they have unfixed CVE issues)
##

AC_MSG_CHECKING([if the high-level GIF tools are enabled])
AC_ARG_ENABLE([hlgiftools],
     [AS_HELP_STRING([--enable-hlgiftools],
                     [Enable the high-level GIF tools. NOTE: These have unfixed CVE issues!
                     [default=no]
                     ])],
     [HDF5_HL_GIF_TOOLS=$enableval])

if test "X-$HDF5_TOOLS" = "X-yes" -a "X-$HDF5_HL" = "X-yes" -a "X-$HDF5_HL_GIF_TOOLS" = "X-yes"; then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
  HDF5_HL_GIF_TOOLS="no"
fi


## ----------------------------------------------------------------------
## Check if they would like to enable building doxygen files
##

## This needs to be exposed for the library info file.
AC_SUBST([HDF5_DOXYGEN])

## Default is to not build DOXYGEN
HDF5_DOXYGEN=no

AC_MSG_CHECKING([if building doxygen is enabled])

AC_ARG_ENABLE([doxygen],
              [AS_HELP_STRING([--enable-doxygen],
                              [Compile the HDF5 doxygen files [default=no]])],
              [HDF5_DOXYGEN=$enableval])

AC_MSG_RESULT([$HDF5_DOXYGEN])

## Check if they would like to enable doxygen warnings as errors
##

## This needs to be exposed for the library info file.
AC_SUBST([HDF5_DOXY_WARNINGS])

## Default is not to consider doxygen warnings as errors
DOXY_ERR=yes

AC_MSG_CHECKING([if doxygen warnings as errors is enabled])

AC_ARG_ENABLE([doxygen-errors],
              [AS_HELP_STRING([--enable-doxygen-errors],
                              [Error on HDF5 doxygen warnings [default=no]])],
              [DOXY_ERR=$enableval])

if test "X$DOXY_ERR" = "Xyes"; then
    HDF5_DOXY_WARNINGS="FAIL_ON_WARNINGS"
else
    HDF5_DOXY_WARNINGS="NO"

fi
AC_MSG_RESULT([$HDF5_DOXY_WARNINGS])

if test "X$HDF5_DOXYGEN" = "Xyes"; then
  DX_DOXYGEN_FEATURE(ON)
  DX_DOT_FEATURE(OFF)
  DX_HTML_FEATURE(ON)
  DX_CHM_FEATURE(OFF)
  DX_CHI_FEATURE(OFF)
  DX_MAN_FEATURE(ON)
  DX_RTF_FEATURE(OFF)
  DX_XML_FEATURE(OFF)
  DX_PDF_FEATURE(OFF)
  DX_PS_FEATURE(OFF)

  AC_SUBST([DOXYGEN_PACKAGE])
  AC_SUBST([DOXYGEN_VERSION_STRING])
  AC_SUBST([DOXYGEN_DIR])
  AC_SUBST([DOXYGEN_INCLUDE_ALIASES])
  AC_SUBST([DOXYGEN_PROJECT_LOGO])
  AC_SUBST([DOXYGEN_PROJECT_BRIEF])
  AC_SUBST([DOXYGEN_INPUT_DIRECTORY])
  AC_SUBST([DOXYGEN_OPTIMIZE_OUTPUT_FOR_C])
  AC_SUBST([DOXYGEN_MACRO_EXPANSION])
  AC_SUBST([DOXYGEN_OUTPUT_DIRECTORY])
  AC_SUBST([DOXYGEN_EXAMPLES_DIRECTORY])
  AC_SUBST([DOXYGEN_LAYOUT_FILE])
  AC_SUBST([DOXYGEN_HTML_HEADER])
  AC_SUBST([DOXYGEN_HTML_FOOTER])
  AC_SUBST([DOXYGEN_HTML_EXTRA_STYLESHEET])
  AC_SUBST([DOXYGEN_HTML_EXTRA_FILES])
  AC_SUBST([DOXYGEN_TAG_FILE])
  AC_SUBST([DOXYGEN_SERVER_BASED_SEARCH])
  AC_SUBST([DOXYGEN_EXTERNAL_SEARCH])
  AC_SUBST([DOXYGEN_SEARCHENGINE_URL])
  AC_SUBST([DOXYGEN_STRIP_FROM_PATH])
  AC_SUBST([DOXYGEN_STRIP_FROM_INC_PATH])
  AC_SUBST([DOXYGEN_PREDEFINED])

# SRCDIR Environment variables used inside doxygen macro for the source location:
  DOXYGEN_PACKAGE=${PACKAGE_NAME}
  DOXYGEN_VERSION_STRING=${PACKAGE_VERSION}
  DOXYGEN_DIR='$(SRCDIR)/doxygen'
  DOXYGEN_INCLUDE_ALIASES_PATH='$(SRCDIR)/doxygen'
  DOXYGEN_INCLUDE_ALIASES='$(SRCDIR)/doxygen/aliases'
  DOXYGEN_VERBATIM_VARS='DOXYGEN_INCLUDE_ALIASES'
  DOXYGEN_PROJECT_LOGO='$(SRCDIR)/doxygen/img/HDFG-logo.png'
  DOXYGEN_PROJECT_BRIEF='API Reference'
  DOXYGEN_INPUT_DIRECTORY='$(SRCDIR) $(SRCDIR)/doxygen/dox'
  DOXYGEN_OPTIMIZE_OUTPUT_FOR_C=YES
  DOXYGEN_MACRO_EXPANSION=YES
  DOXYGEN_OUTPUT_DIRECTORY=hdf5lib_docs
  DOXYGEN_EXAMPLES_DIRECTORY='$(SRCDIR)/doxygen/dox/cookbook $(SRCDIR)/doxygen/examples $(SRCDIR)/src $(SRCDIR)/examples $(SRCDIR)/test'
  DOXYGEN_LAYOUT_FILE='$(SRCDIR)/doxygen/hdf5doxy_layout.xml'
  DOXYGEN_HTML_HEADER='$(SRCDIR)/doxygen/hdf5_header.html'
  DOXYGEN_HTML_FOOTER='$(SRCDIR)/doxygen/hdf5_footer.html'
  DOXYGEN_HTML_EXTRA_STYLESHEET='$(SRCDIR)/doxygen/hdf5doxy.css'
  DOXYGEN_HTML_EXTRA_FILES='$(SRCDIR)/doxygen/hdf5_navtree_hacks.js'
  DOXYGEN_TAG_FILE=hdf5.tag
  DOXYGEN_SERVER_BASED_SEARCH=NO
  DOXYGEN_EXTERNAL_SEARCH=NO
  DOXYGEN_SEARCHENGINE_URL=
  DOXYGEN_STRIP_FROM_PATH='$(SRCDIR)'
  DOXYGEN_STRIP_FROM_INC_PATH='$(SRCDIR)'
  DOXYGEN_PREDEFINED='H5_HAVE_DIRECT H5_HAVE_LIBHDFS H5_HAVE_MAP_API H5_HAVE_PARALLEL H5_HAVE_ROS3_VFD H5_DOXYGEN H5_HAVE_SUBFILING_VFD H5_HAVE_IOC_VFD H5_HAVE_MIRROR_VFD'
  DOXYGEN_WARN_AS_ERROR=${HDF5_DOXY_WARNINGS}

  DX_INIT_DOXYGEN([HDF5], [./doxygen/Doxyfile], [hdf5lib_docs])
fi


## ----------------------------------------------------------------------
## Create libtool.  If shared/static libraries are going to be enabled
## or disabled, it should happen before these macros.
LT_PREREQ([2.2])

## ----------------------------------------------------------------------
## dlopen - This will use an improved version of libtool
## win32-dll - This will build clean dlls on win32 platforms.
LT_INIT([dlopen,win32-dll])

## ----------------------------------------------------------------------
## Check if we should install only statically linked executables.
##   This check needs to occur after libtool is initialized because
##   we check a libtool cache value and may issue a warning based
##   on its result.
AC_SUBST([STATIC_EXEC])

## Default is no
STATIC_EXEC=no

AC_MSG_CHECKING([if we should install only statically linked executables])
AC_ARG_ENABLE([static_exec],
              [AS_HELP_STRING([--enable-static-exec],
                              [Install only statically linked executables
                               [default=no]])],
              [STATIC_EXEC=$enableval])
AC_MSG_RESULT([$STATIC_EXEC])

if test "X$STATIC_EXEC" = "Xyes"; then
  ## Issue a warning if -static flag is not supported.
  if test "X$lt_cv_prog_compiler_static_works" = "Xno"; then
    AC_MSG_WARN([-static flag not supported on this system; executable won't statically link shared system libraries.])
    LT_STATIC_EXEC=""
  else
    LT_STATIC_EXEC="-all-static"
  fi
else
  LT_STATIC_EXEC=""
fi
AM_CONDITIONAL([USE_PLUGINS_CONDITIONAL], [test "X$LT_STATIC_EXEC" = X])

AC_SUBST([LT_STATIC_EXEC])

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

## ----------------------------------------------------------------------
## Some users have reported problems with libtool's use of '-Wl,-rpath' to
## link shared libraries in nondefault directories. Allow users to
## disable embedding the rpath information in the executables and to
## instead solely rely on the information in LD_LIBRARY_PATH.
AC_MSG_CHECKING([if -Wl,-rpath should be used to link shared libs in nondefault directories])
AC_ARG_ENABLE([sharedlib-rpath],
              [AS_HELP_STRING([--disable-sharedlib-rpath],
               [Disable use of the '=Wl,-rpath' linker option])],
              [RPATH=$enableval])

case "X-$RPATH" in
  X-no)
    AC_MSG_RESULT([no])
    runpath_var=
    hardcode_libdir_flag_spec=
    hardcode_libdir_flag_spec_ld=
    hardcode_into_libs=no
    ;;
  X-|X-yes)
    AC_MSG_RESULT([yes])
    ;;
  *)
    AC_MSG_RESULT([error])
    AC_MSG_ERROR([\'$enableval\' is not a valid rpath type])
    ;;
esac

## ----------------------------------------------------------------------
## Check for system libraries. "dl" stands for dynamically loaded library
##
AC_CHECK_LIB([m], [ceil])
AC_CHECK_LIB([dl], [dlopen])

## ----------------------------------------------------------------------
## Check for system header files.
##

## Unix
AC_CHECK_HEADERS([dirent.h features.h pwd.h unistd.h])
AC_CHECK_HEADERS([sys/file.h sys/ioctl.h sys/resource.h])
AC_CHECK_HEADERS([sys/stat.h sys/time.h sys/types.h])

## Darwin
AC_SUBST([H5_IS_DARWIN])
H5_IS_DARWIN="no"
case $host_os in
  darwin*)
    AC_DEFINE([HAVE_DARWIN], [1], [Define if Darwin or Mac OS X])
    H5_IS_DARWIN="yes"
    ;;
esac

## Windows
case "`uname`" in
  MINGW*)
    # The Winsock library
    AC_CHECK_LIB([ws2_32], [GetUserName])
    ;;
esac

# Mirror VFD networking
AC_CHECK_HEADERS([arpa/inet.h netdb.h netinet/in.h sys/socket.h])

## ----------------------------------------------------------------------
## Some platforms require that all symbols are resolved when a library
## is linked. We can use the -no-undefined flag to tell libtool that
## it will be able to build shared libraries on these architectures,
## as it will not do so by default.
##
if test "X${enable_shared}" = "Xyes"; then
  AC_MSG_CHECKING([if libtool needs -no-undefined flag to build shared libraries])
  case "`uname`" in
    CYGWIN*|MINGW*|AIX*)
      ## Add in the -no-undefined flag to LDFLAGS for libtool.
      AC_MSG_RESULT([yes])
      H5_LDFLAGS="$H5_LDFLAGS -no-undefined"
      ;;
    *)
      ## Don't add in anything.
      AC_MSG_RESULT([no])
      ;;
  esac
fi

## ----------------------------------------------------------------------
## Set up large file support

AC_SYS_LARGEFILE

## ----------------------------------------------------------------------
## Add necessary defines for Linux Systems.
##
case "$host_cpu-$host_vendor-$host_os" in
  *linux*)
    ## Add POSIX support on Linux systems, so <features.h> defines
    ## __USE_POSIX, which is required to get the prototype for fdopen
    ## defined correctly in <stdio.h>.
    ##
    ## This flag was removed from h5cc as of 2009-10-17 when it was found
    ## that the flag broke compiling netCDF-4 code with h5cc, but kept in
    ## H5_CPPFLAGS because fdopen and HDfdopen fail without it. HDfdopen
    ## is used only by H5_debug_mask which is used only when debugging in
    ## H5_init_library (all in H5.c).  When the flag was removed this was
    ## the only compile failure noted.
    ##
    ## This was originally defined as _POSIX_SOURCE which was updated to
    ## _POSIX_C_SOURCE=199506L to expose a greater amount of POSIX
    ## functionality so clock_gettime and CLOCK_MONOTONIC are defined
    ## correctly. This was later updated to 200112L so that
    ## posix_memalign() is visible for the direct VFD code on Linux
    ## systems. Even later, this was changed to 200809L to support
    ## pread/pwrite in VFDs.
    ##
    ## POSIX feature information can be found in the gcc manual at:
    ## http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
    H5_CPPFLAGS="-D_POSIX_C_SOURCE=200809L $H5_CPPFLAGS"

    ## Need to add this so that O_DIRECT is visible for the direct
    ## VFD on Linux systems.
    H5_CPPFLAGS="-D_GNU_SOURCE $H5_CPPFLAGS"
    ;;
  *mingw*)
    AC_DEFINE([HAVE_WINDOWS], [1], [Define if this is a Windows machine])
    AC_DEFINE([HAVE_WIN32_API], [1], [Define if on the Windows platform using the Win32 API])
    AC_DEFINE([HAVE_MINGW], [1], [Define if using MinGW])
    H5_CPPFLAGS="-D_GNU_SOURCE -D__USE_MINGW_ANSI_STDIO $H5_CPPFLAGS"
    ;;
esac

## Need to add the AM_ and H5_ into CFLAGS/CPPFLAGS to make them visible
## for configure checks.
## Note: Both will be restored by the end of configure.
CPPFLAGS="$H5_CPPFLAGS $AM_CPPFLAGS $CPPFLAGS"
CFLAGS="$H5_CFLAGS $AM_CFLAGS $CFLAGS"

## Checkpoint the cache
AC_CACHE_SAVE

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

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

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

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

AC_CHECK_SIZEOF([bool], [], [#include <stdbool.h>])
AC_CHECK_SIZEOF([off_t])
AC_CHECK_SIZEOF([ptrdiff_t])
AC_CHECK_SIZEOF([size_t])
AC_CHECK_SIZEOF([ssize_t])
AC_CHECK_SIZEOF([time_t], [], [#include <time.h>])

## Checkpoint the cache
AC_CACHE_SAVE

## ----------------------------------------------------------------------
## Check if the dev_t type is a scalar type (must come after the check for
## sys/types.h)
AC_MSG_CHECKING([if dev_t is scalar])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#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])])

## ----------------------------------------------------------------------
## Fake --with-xxx option to allow us to create a help message for the
## following --with-xxx options which can take either a =DIR or =INC,LIB
## specifier.
##
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
  ])

## ----------------------------------------------------------------------
## Make the external filters list available to *.in files
## At this point it's unset (no external filters by default) but it
## will be filled in during the deflate/zlib and szip/libaec processing
## below.
##
AC_SUBST([EXTERNAL_FILTERS])

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

case "X-$withval" in
  X-yes)
    HAVE_ZLIB="yes"
    AC_CHECK_HEADERS([zlib.h], [HAVE_ZLIB_H="yes"], [unset HAVE_ZLIB])
    if test "x$HAVE_ZLIB" = "xyes" -a "x$HAVE_ZLIB_H" = "xyes"; then
      AC_CHECK_LIB([z], [compress2],, [unset HAVE_ZLIB])
    fi
    if test -z "$HAVE_ZLIB"; then
      if test -n "$HDF5_CONFIG_ABORT"; then
        AC_MSG_ERROR([couldn't find zlib library])
      fi
    else
      AC_CHECK_FUNC([compress2], [HAVE_COMPRESS2="yes"])
    fi
    ;;
  X-|X-no|X-none)
    HAVE_ZLIB="no"
    AC_MSG_CHECKING([for zlib])
    AC_MSG_RESULT([suppressed])
    ;;
  *)
    HAVE_ZLIB="yes"
    case "$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

    saved_CPPFLAGS="$CPPFLAGS"
    saved_AM_CPPFLAGS="$AM_CPPFLAGS"
    saved_LDFLAGS="$LDFLAGS"
    saved_AM_LDFLAGS="$AM_LDFLAGS"

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

    AC_CHECK_HEADERS([zlib.h],
                     [HAVE_ZLIB_H="yes"],
                     [CPPFLAGS="$saved_CPPFLAGS"; AM_CPPFLAGS="$saved_AM_CPPFLAGS"] [unset HAVE_ZLIB])

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

    if test "x$HAVE_ZLIB" = "xyes" -a "x$HAVE_ZLIB_H" = "xyes"; then
      AC_CHECK_LIB([z], [compress2],,
                   [LDFLAGS="$saved_LDFLAGS"; AM_LDFLAGS="$saved_AM_LDFLAGS"; unset HAVE_ZLIB])
    fi

    if test -z "$HAVE_ZLIB"; then
      if test -n "$HDF5_CONFIG_ABORT"; then
        AC_MSG_ERROR([couldn't find zlib library])
      fi
    else
      AC_CHECK_FUNC([compress2], [HAVE_COMPRESS2="yes"])
    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"

  ## 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


## ----------------------------------------------------------------------
## Is the szlib present? It has a header file `szlib.h' and a library
## `-lsz' and their locations might be specified with the `--with-szlib'
## command-line switch. The value is an include path and/or a library path.
## If the library path is specified then it must be preceded by a comma.
##
## libaec also implements Space Data System Standard 121.0-B-2 and has
## an szip compatibility header. Since the AEC library is BSD licensed
## for both encoding and decoding, we now build with the filter enabled
## by default when the library is found.
##
AC_SUBST([LL_PATH])
AC_SUBST([USE_FILTER_SZIP]) USE_FILTER_SZIP="no"
AC_ARG_WITH([szlib],
            [AS_HELP_STRING([--with-szlib=DIR],
                            [Use szlib library for external szlib I/O
                             filter [default=yes]])],,
            [withval=yes])

case "X-$withval" in
  X-yes)
    HAVE_SZLIB="yes"
    AC_CHECK_HEADERS([szlib.h], [HAVE_SZLIB_H="yes"], [unset HAVE_SZLIB])
    if test "x$HAVE_SZLIB" = "xyes" -a "x$HAVE_SZLIB_H" = "xyes"; then
      AC_CHECK_LIB([sz], [SZ_BufftoBuffCompress],, [unset HAVE_SZLIB])
    fi
    if test -z "$HAVE_SZLIB" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR([couldn't find szlib library])
    fi
    ;;
  X-|X-no|X-none)
    HAVE_SZLIB="no"
    AC_MSG_CHECKING([for szlib])
    AC_MSG_RESULT([suppressed])
    ;;
  *)
    HAVE_SZLIB="yes"
    case "$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

    saved_CPPFLAGS="$CPPFLAGS"
    saved_AM_CPPFLAGS="$AM_CPPFLAGS"
    saved_LDFLAGS="$LDFLAGS"
    saved_AM_LDFLAGS="$AM_LDFLAGS"

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

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

    if test "x$HAVE_SZLIB" = "xyes"; then
      AC_CHECK_LIB([sz], [SZ_BufftoBuffCompress],,
                   [CPPFLAGS="$saved_CPPFLAGS"; AM_CPPFLAGS="$saved_AM_CPPFLAGS"; LDFLAGS="$saved_LDFLAGS"; AM_LDFLAGS="$saved_AM_LDFLAGS"; unset HAVE_SZLIB])
      if test -n "$HAVE_SZLIB"; then
        AC_CHECK_HEADERS([szlib.h],
                         [HAVE_SZLIB_H="yes"],
                         [CPPFLAGS="$saved_CPPFLAGS"; AM_CPPFLAGS="$saved_AM_CPPFLAGS"] [unset HAVE_SZLIB])
      else
        AC_MSG_RESULT([Using SZ_BufftoBuffCompress from libsz in $szlib_lib failed.  Szip not enabled.])
      fi
    fi

    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
  ## SZLIB library is available.  Check if it can encode
  AC_MSG_CHECKING([for szlib encoder])

  ## Set LD_LIBRARY_PATH so encoder test can find the library and run.
  ## Also add LL_PATH substitution to Makefiles so they can use the
  ## path as well, for testing examples.
  if test -z "$LD_LIBRARY_PATH"; then
    export LD_LIBRARY_PATH="$szlib_lib"
  else
    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$szlib_lib"
  fi

  LL_PATH="$LD_LIBRARY_PATH"

  # CROSS-COMPILING: Assume 'yes' now that libaec is so prevalent
  AC_CACHE_VAL([hdf5_cv_szlib_can_encode],
        [AC_RUN_IFELSE(
            [AC_LANG_PROGRAM([
                #include "szlib.h"
            ],[[
                /* SZ_encoder_enabled returns 1 if encoder is present */
                return SZ_encoder_enabled() != 1;
            ]])]
        , [hdf5_cv_szlib_can_encode=yes], [hdf5_cv_szlib_can_encode=no], [hdf5_cv_szlib_can_encode=yes])]
   )

  AC_DEFINE([HAVE_FILTER_SZIP], [1],
            [Define if support for szip filter is enabled])
  USE_FILTER_SZIP="yes"

  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

  ## 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

AM_CONDITIONAL([BUILD_SHARED_SZIP_CONDITIONAL], [test "X$USE_FILTER_SZIP" = "Xyes" && test "X$LL_PATH" != "X"])

## Checkpoint the cache
AC_CACHE_SAVE

## ----------------------------------------------------------------------
## Enable thread-safe version of library.  It requires Pthreads support
## on POSIX systems.
##
AC_SUBST([THREADSAFE])

## Default is no thread-safety
THREADSAFE=no

AC_MSG_CHECKING([for thread safe support])
AC_ARG_ENABLE([threadsafe],
              [AS_HELP_STRING([--enable-threadsafe],
                              [Enable thread-safe capability. Not compatible with the high-level library, Fortran, or C++ wrappers.
                              [default=no]])],
              [THREADSAFE=$enableval])

## The high-level, C++, Fortran and Java interfaces are not compatible
## with the thread-safety option because the lock is not hoisted
## into the higher-level API calls.

## --enable-threadsafe is incompatible with --enable-hl unless
## --enable-unsupported has been specified on the configure line.
##
## Note that the high-level library is enabled by default so most
## users will have to add --disable-hl to the configure options.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${HDF5_HL}" = "Xyes" -a "X${enable_threadsafe}" = "Xyes"; then
    AC_MSG_ERROR([The thread-safe library is incompatible with the high-level library. --disable-hl can be used to prevent building the high-level library (recommended). Alternatively, --enable-unsupported will allow building the high-level library, though this configuration is not supported by The HDF Group.])
  fi
fi

## The --enable-threadsafe flag is not compatible with --enable-cxx.
## If the user tried to specify both flags, throw an error, unless
## they also provided the --enable-unsupported flag.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${HDF_CXX}" = "Xyes" -a "X${enable_threadsafe}" = "Xyes"; then
    AC_MSG_ERROR([--enable-cxx and --enable-threadsafe flags are incompatible. Use --enable-unsupported to override this error.])
  fi
fi

## --enable-threadsafe is also incompatible with --enable-fortran unless
## --enable-unsupported has been specified on the configure line.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${HDF_FORTRAN}" = "Xyes" -a "X${enable_threadsafe}" = "Xyes"; then
    AC_MSG_ERROR([--enable-fortran and --enable-threadsafe flags are incompatible. Use --enable-unsupported to override this error.])
  fi
fi

## --enable-threadsafe is also incompatible with --enable-java unless
## --enable-unsupported has been specified on the configure line.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${HDF_JAVA}" = "Xyes" -a "X${enable_threadsafe}" = "Xyes"; then
    AC_MSG_ERROR([--enable-java and --enable-threadsafe flags are incompatible. Use --enable-unsupported to override this error.])
  fi
fi


case "X-$THREADSAFE" in
  X-|X-no)
    AC_MSG_RESULT([no])
    ;;
  X-yes)
    THREADSAFE=yes
    AC_MSG_RESULT([yes])
    ;;
  *)
    AC_MSG_RESULT([error])
    AC_MSG_ERROR([\'$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])

    ## ----------------------------------------------------------------------
    ## Is the Pthreads library present?  It has a header file `pthread.h' and
    ## a library `-lpthread' and their locations might be specified with the
    ## `--with-pthread' command-line switch.  The value is an include path
    ## and/or a library path.  If the library path is specified then it must
    ## be preceded by a comma.
    ##
    ## Thread-safety in HDF5 only uses Pthreads via configure, so the
    ## default is "check", though this only has an effect when
    ## --enable-threadsafe is specified.
    AC_SUBST([HAVE_PTHREAD]) HAVE_PTHREAD=yes
    AC_ARG_WITH([pthread],
                [AS_HELP_STRING([--with-pthread=DIR],
                                [Specify alternative path to Pthreads library when
                                thread-safe capability is built.])],,
                [withval=check])

    case "$withval" in
      check | yes)
        AC_CHECK_HEADERS([pthread.h],, [unset HAVE_PTHREAD])
        if test "x$HAVE_PTHREAD" = "xyes"; then
          AC_CHECK_LIB([pthread], [pthread_self],, [unset HAVE_PTHREAD])
        fi
        ;;
      no)
        AC_MSG_ERROR([Must use Pthreads with thread safety])
        ;;
      *)
        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

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

        if test "x$HAVE_PTHREAD" = "xyes"; then
          if test -n "$pthread_lib"; then
            saved_LDFLAGS="$LDFLAGS"
            saved_AM_LDFLAGS="$AM_LDFLAGS"
            LDFLAGS="$LDFLAGS -L$pthread_lib"
            AM_LDFLAGS="$AM_LDFLAGS -L$pthread_lib"
            AC_CHECK_LIB([pthread], [pthread_self],,
                         [LDFLAGS="$saved_LDFLAGS"; AM_LDFLAGS="$saved_AM_LDFLAGS"; unset HAVE_PTHREAD])
          else
            AC_CHECK_LIB([pthread], [pthread_self],, [unset HAVE_PTHREAD])
          fi
        fi
        ;;
    esac

    ## ----------------------------------------------------------------------
    ## Check if pthread_attr_setscope(&attribute, PTHREAD_SCOPE_SYSTEM)
    ## is supported on this system
    ##
    ## Unfortunately, this probably needs to be an AC_RUN_IFELSE since
    ## it's impossible to determine if PTHREAD_SCOPE_SYSTEM is
    ## supported a priori. POSIX.1-2001 requires that a conformant
    ## system need only support one of SYSTEM or PROCESS scopes.
    ##
    ## CROSS-COMPILING: Use a pessimistic 'no'. You can hand-hack the config
    ##                  file if you know otherwise.
    AC_MSG_CHECKING([Pthreads supports system scope])
    AC_CACHE_VAL([hdf5_cv_system_scope_threads],
      [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM([
            #include <stdlib.h>
            #include <pthread.h>
        ],[
              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], [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])
      AC_MSG_NOTICE([Always 'no' if cross-compiling. Edit the config file if your platform supports pthread_attr_setscope(&attribute, PTHREAD_SCOPE_SYSTEM).])
    fi
fi

## ----------------------------------------------------------------------
## Check for MONOTONIC_TIMER support (used in clock_gettime).  This has
## to be done after any POSIX defines to ensure that the test gets
## the correct POSIX level on linux.
AC_CHECK_DECL([CLOCK_MONOTONIC],[have_clock_monotonic="yes"],[have_clock_monotonic="no"],[[#include <time.h>]])

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

## First check if `struct tm' has a `tm_gmtoff' member.
AC_MSG_CHECKING([for tm_gmtoff in struct tm])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #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])])

## Check whether the global variable `timezone' is defined.
AC_MSG_CHECKING([for global timezone variable])

case "`uname`" in
  CYGWIN*)
    AC_MSG_RESULT([disabled in CYGWIN])
    ;;
  *)
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    #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])])
    ;;
esac


## ----------------------------------------------------------------------
## Does the struct stat have the st_blocks field? This field is not POSIX.
##
AC_MSG_CHECKING([for st_blocks in struct stat])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #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])])

## ----------------------------------------------------------------------
## How do we figure out the width of a tty in characters?
##
AC_CHECK_FUNCS([_getvideoconfig gettextinfo])
case "`uname`" in
  CYGWIN*)
    ;;
  *)
    AC_CHECK_FUNCS([GetConsoleScreenBufferInfo])
    ;;
esac
AC_CHECK_FUNCS([_scrsize ioctl])

AC_MSG_CHECKING([for struct videoconfig])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[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_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[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_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#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_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#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])])


## ----------------------------------------------------------------------
## Check for functions.
##
## NOTE: clock_gettime may require linking to the rt or posix4 library
##       so we'll search for it before calling AC_CHECK_FUNCS.
AC_SEARCH_LIBS([clock_gettime], [rt posix4])
AC_CHECK_FUNCS([alarm asprintf clock_gettime fcntl flock fork])
AC_CHECK_FUNCS([gethostname getrusage gettimeofday])
AC_CHECK_FUNCS([rand_r random])
AC_CHECK_FUNCS([strcasestr strdup symlink])
AC_CHECK_FUNCS([tmpfile vasprintf waitpid])

## ----------------------------------------------------------------------
## Check compiler characteristics
##
AC_MSG_CHECKING([for __attribute__ extension])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[int __attribute__((unused)) x]])],
               [AC_DEFINE([HAVE_ATTRIBUTE], [1],
                         [Define if the __attribute__(()) extension is present])
                 AC_MSG_RESULT([yes])],
               [AC_MSG_RESULT([no])])

## ----------------------------------------------------------------------
## Remove old ways of determining debug/production build.
## These were used in 1.8.x and earlier. We should probably keep these checks
## around to help people migrate to 1.10.x and newer versions.
##
AC_ARG_ENABLE([debug],
              [AS_HELP_STRING([--enable-debug], [OPTION CHANGE: use --enable-build-mode=debug])],
              [AC_MSG_ERROR([--enable-debug is no longer supported, use --enable-build-mode=debug instead.])])

AC_ARG_ENABLE([production],
              [AS_HELP_STRING([--enable-production], [OPTION CHANGE: use --enable-build-mode=production])],
              [AC_MSG_ERROR([--enable-production is no longer supported, use --enable-build-mode=production instead.])])


## ----------------------------------------------------------------------
## Check if the compiler should include build diagnostics
##
AC_MSG_CHECKING([enable build diagnostics])
AC_ARG_ENABLE([diags],
              [AS_HELP_STRING([--enable-diags=(yes|no|<custom>)],
                              [Allow default enhanced diagnostics to the build.
                               This is independent of the build mode and optimization
                               level.
                               [default=no]
                               ])],
              [DIAGS=$enableval])

## Set default
if test "X-$DIAGS" = X- ; then
  DIAGS=no
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([DIAGS])

case "X-$DIAGS" in
  X-yes)
    H5_CFLAGS="$H5_CFLAGS $DIAGS_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $DIAGS_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $DIAGS_FCFLAGS"
    AC_MSG_RESULT([yes])
    ;;
  X-no)
    H5_CFLAGS="$H5_CFLAGS $NO_DIAGS_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $NO_DIAGS_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $NO_DIAGS_FCFLAGS"
    AC_MSG_RESULT([no])
    ;;
  *)
    H5_CFLAGS="$H5_CFLAGS $DIAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $DIAGS"
    H5_FCFLAGS="$H5_FCFLAGS $DIAGS"
    DIAGS="custom ($DIAGS)"
    AC_MSG_RESULT([$DIAGS])
    ;;
esac


## ----------------------------------------------------------------------
## Check if the compiler should include symbols
##
AC_MSG_CHECKING([enable debugging symbols])
AC_ARG_ENABLE([symbols],
              [AS_HELP_STRING([--enable-symbols=(yes|no|<custom>)],
                              [Add debug symbols to the library (e.g.: build with -g).
                               This is independent of the build mode and optimization
                               level. The custom string allows special settings like
                               -ggdb, etc. to be used.
                               [default=yes if debug build, otherwise no]
                               ])],
              [SYMBOLS=$enableval])

## Set default
if test "X-$SYMBOLS" = X- ; then
  if test "X-$BUILD_MODE" = "X-debug" ; then
    SYMBOLS=yes
  else
    SYMBOLS=no
  fi
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([SYMBOLS])

case "X-$SYMBOLS" in
  X-yes)
    H5_CFLAGS="$H5_CFLAGS $SYMBOLS_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $SYMBOLS_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $SYMBOLS_FCFLAGS"
    AC_MSG_RESULT([yes])
    ;;
  X-no)
    H5_CFLAGS="$H5_CFLAGS $NO_SYMBOLS_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $NO_SYMBOLS_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $NO_SYMBOLS_FCFLAGS"
    AC_MSG_RESULT([no])
    ;;
  *)
    H5_CFLAGS="$H5_CFLAGS $SYMBOLS"
    H5_CXXFLAGS="$H5_CXXFLAGS $SYMBOLS"
    H5_FCFLAGS="$H5_FCFLAGS $SYMBOLS"
    SYMBOLS="custom ($SYMBOLS)"
    AC_MSG_RESULT([$SYMBOLS])
    ;;
esac

## ----------------------------------------------------------------------
## Check if the assert macro should be enabled
##
AC_MSG_CHECKING([enable asserts])
AC_ARG_ENABLE([asserts],
              [AS_HELP_STRING([--enable-asserts],
                              [Determines whether NDEBUG is defined or not, which
                               controls assertions.
                               This is independent of the build mode and presence
                               of debugging symbols.
                               [default=yes if debug build, otherwise no]
                               ])],
              [ASSERTS=$enableval])

## Set default
if test "X-$ASSERTS" = X- ; then
  if test "X-$BUILD_MODE" = "X-debug" ; then
    ASSERTS=yes
  else
    ASSERTS=no
  fi
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([ASSERTS])

case "X-$ASSERTS" in
  X-yes)
    H5_CPPFLAGS="$H5_CPPFLAGS -UNDEBUG"
    AC_MSG_RESULT([yes])
    ;;
  X-no)
    H5_CPPFLAGS="$H5_CPPFLAGS -DNDEBUG"
    AC_MSG_RESULT([no])
    ;;
  *)
    AC_MSG_ERROR([Unrecognized value: $ASSERTS])
    ;;
esac

## Incorporate the potentially warning-to-error promoting flags after
## feature tests.  Some of the tests (e.g., `off_t`) generate compilation
## errors with the flags we chose for the HDF5 library and tools.
##
H5_CFLAGS="$H5_CFLAGS $H5_ECFLAGS"
H5_CXXFLAGS="$H5_CXXFLAGS $H5_ECXXFLAGS"

## ----------------------------------------------------------------------
## Check if developer warnings should be turned on
## These are warnings that provide suggestions like gcc's -Wsuggest-attribute.
## They do not indicate code problems.
##
## Note that developers don't need to build with these regularly. They
## are just handy to check once in a while (before releases, etc.).
##
AC_MSG_CHECKING([enable developer warnings])
AC_ARG_ENABLE([developer-warnings],
              [AS_HELP_STRING([--enable-developer-warnings],
                              [Determines whether developer warnings will be
                               emitted. These are usually performance suggestions
                               (e.g. -Wsuggest-attribute) and do not flag poor code
                               quality.
                               [default=no]
                               ])],
              [DEV_WARNINGS=$enableval])

## Set default
if test "X-$DEV_WARNINGS" = X- ; then
  DEV_WARNINGS=no
fi

case "X-$DEV_WARNINGS" in
  X-yes)
    H5_CFLAGS="$H5_CFLAGS $DEVELOPER_WARNING_CFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $DEVELOPER_WARNING_FCFLAGS"
    AC_MSG_RESULT([yes])
    ;;
  X-no)
    H5_CFLAGS="$H5_CFLAGS $NO_DEVELOPER_WARNING_CFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $NO_DEVELOPER_WARNING_FCFLAGS"
    AC_MSG_RESULT([no])
    ;;
  *)
    AC_MSG_ERROR([Unrecognized value: $DEV_WARNINGS])
    ;;
esac

## ----------------------------------------------------------------------
## Check if they would like suppessed compiler diagnostics displayed
## (i.e. not suppressed)
##
## NOTE: Compiler diagnostics (i.e. warnings) are suppressed for some
##	"noisy" warnings that are harmless (in the opinion of the primary
##	HDF5 development team), but this option is provided to allow
##	developers to see those warnings.
##
AC_MSG_CHECKING([whether showing all compiler warnings is enabled])
AC_ARG_ENABLE([show-all-warnings],
              [AS_HELP_STRING([--enable-show-all-warnings],
                              [Enable showing all compiler warnings (for developer debugging).
                               [default=no]
                              ])],
              [SHOW_ALL_WARNINGS=$enableval])

## Set the default level.
if test "X-$SHOW_ALL_WARNINGS" = X- ; then
  SHOW_ALL_WARNINGS=no
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([SHOW_ALL_WARNINGS])

case "X-$SHOW_ALL_WARNINGS" in
  X-yes)
      AC_MSG_RESULT([yes])
      AC_DEFINE([SHOW_ALL_WARNINGS], [1], [Define if showing all warnings is desired (i.e. not suppressed internally with H5_DIAG_OFF)])
    ;;
  X-no)
      AC_MSG_RESULT([no])
    ;;
  *)
      AC_MSG_ERROR([Unrecognized value: $SHOW_ALL_WARNINGS])
    ;;
esac

## ----------------------------------------------------------------------
## Check if the compiler should use profiling flags/settings
##
AC_MSG_CHECKING([profiling])
AC_ARG_ENABLE([profiling],
              [AS_HELP_STRING([--enable-profiling=(yes|no|<custom>)],
                              [Enable profiling flags (e.g.: -pg).
                               This can be set independently from the build mode.
                               The custom setting can be used to pass alternative
                               profiling flags (e.g.: -P for using Prof with gcc).
                               [default=no]
                               ])],
              [PROFILING=$enableval])

## Default is no profiling
if test "X-$PROFILING" = X- ; then
    PROFILING=no
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([PROFILING])

case "X-$PROFILING" in
  X-yes)
    H5_CFLAGS="$H5_CFLAGS $PROFILE_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $PROFILE_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $PROFILE_FCFLAGS"
    AC_MSG_RESULT([yes])
    ;;
  X-no)
    AC_MSG_RESULT([no])
    ;;
  *)
    H5_CFLAGS="$H5_CFLAGS $PROFILING"
    H5_CXXFLAGS="$H5_CXXFLAGS $PROFILING"
    H5_FCFLAGS="$H5_FCFLAGS $PROFILING"
    PROFILING="custom ($PROFILING)"
    AC_MSG_RESULT([$PROFILING])
    ;;
esac

## ----------------------------------------------------------------------
## Check if the compiler should use a particular optimization setting
##
AC_MSG_CHECKING([optimization level])
AC_ARG_ENABLE([optimization],
              [AS_HELP_STRING([--enable-optimization=(high|debug|none|<custom>)],
                              [Enable optimization flags/settings (e.g.: -O3).
                               This can be set independently from the build mode.
                               Optimizations for a given compiler can be specified
                               at several levels: High, with aggressive optimizations
                               turned on; debug, with optimizations that are
                               unlikely to interfere with debugging or profiling;
                               and none, with no optimizations at all.
                               See the compiler-specific config/*-flags file for more
                               details.
                               Alternatively, optimization options can
                               be specified directly by specifying them as a
                               string value. These custom optimization flags will
                               completely replace all other optimization flags.
                               [default depends on build mode: debug=debug,
                                production=high, clean=none]
                               ])],
              [OPTIMIZATION=$enableval])

## Set the default optimization level. This depends on the compiler mode.
if test "X-$OPTIMIZATION" = X- ; then
  case "X-$BUILD_MODE" in
  X-debug)
    OPTIMIZATION=debug
    ;;
  X-production)
    OPTIMIZATION=high
    ;;
  X-clean)
    OPTIMIZATION=none
    ;;
  esac
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([OPTIMIZATION])

case "X-$OPTIMIZATION" in
  X-high)
    H5_CFLAGS="$H5_CFLAGS $HIGH_OPT_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $HIGH_OPT_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $HIGH_OPT_FCFLAGS"
    AC_MSG_RESULT([high])
    ;;
  X-debug)
    H5_CFLAGS="$H5_CFLAGS $DEBUG_OPT_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $DEBUG_OPT_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $DEBUG_OPT_FCFLAGS"
    AC_MSG_RESULT([debug])
    ;;
  X-none)
    H5_CFLAGS="$H5_CFLAGS $NO_OPT_CFLAGS"
    H5_CXXFLAGS="$H5_CXXFLAGS $NO_OPT_CXXFLAGS"
    H5_FCFLAGS="$H5_FCFLAGS $NO_OPT_FCFLAGS"
    AC_MSG_RESULT([none])
    ;;
  *)
    H5_CFLAGS="$H5_CFLAGS $OPTIMIZATION"
    H5_CXXFLAGS="$H5_CXXFLAGS $OPTIMIZATION"
    H5_FCFLAGS="$H5_FCFLAGS $OPTIMIZATION"
    OPTIMIZATION="custom ($OPTIMIZATION)"
    AC_MSG_RESULT([$OPTIMIZATION])
    ;;
esac

## ----------------------------------------------------------------------
## Check if file locking should be used
##
AC_MSG_CHECKING([enable file locking])
AC_ARG_ENABLE([file-locking],
              [AS_HELP_STRING([--enable-file-locking=(yes|no|best-effort)],
                              [Sets the default for whether or not to use file
                               locking when opening files. Can be overridden
                               with the HDF5_USE_FILE_LOCKING environment variable
                               and the H5Pset_file_locking() API call.
                               best-effort attempts to use file locking but does
                               not fail when file locks have been disabled on
                               the file system (useful with Lustre).
                               [default=best-effort]
                               ])],
              [DESIRED_FILE_LOCKING=$enableval])

## Set defaults
if test "X-$DESIRED_FILE_LOCKING" = X- ; then
  DESIRED_FILE_LOCKING=best-effort
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([DESIRED_FILE_LOCKING])
AC_SUBST([USE_FILE_LOCKING])
AC_SUBST([IGNORE_DISABLED_FILE_LOCKS])

case "X-$DESIRED_FILE_LOCKING" in
  X-best-effort)
      AC_MSG_RESULT([best-effort])
      AC_DEFINE([USE_FILE_LOCKING], [1],
                [Define if the library will use file locking])
      AC_DEFINE([IGNORE_DISABLED_FILE_LOCKS], [1],
                [Define if the library will ignore file locks when disabled])
    ;;
  X-yes)
      AC_MSG_RESULT([yes])
      AC_DEFINE([USE_FILE_LOCKING], [1],
                [Define if the library will use file locking])
    ;;
  X-no)
      AC_MSG_RESULT([no])
    ;;
  *)
      AC_MSG_ERROR([Unrecognized value: $USE_FILE_LOCKING])
    ;;
esac


## ----------------------------------------------------------------------
## Enable/disable internal package-level debugging output
##
AC_MSG_CHECKING([for internal debug output])
AC_ARG_ENABLE([internal-debug],
              [AS_HELP_STRING([--enable-internal-debug=(yes|all|no|none|<pkg list>)],
                              [Enable extra debugging output on HDF5 library
                               errors. One may also specify a comma-separated
                               list of package names without the leading H5.
                               This is independent of the build mode
                               and is mainly of interest to HDF Group developers.
                               Yes/all and no/none are synonymous.
                               [default=all if debug build, otherwise none]
                               ])],
              [INTERNAL_DEBUG_OUTPUT=$enableval])

## Set default
if test "X-$INTERNAL_DEBUG_OUTPUT" = X- ; then
  if test "X-$BUILD_MODE" = "X-debug" ; then
    INTERNAL_DEBUG_OUTPUT=all
  else
    INTERNAL_DEBUG_OUTPUT=none
  fi
fi

AC_SUBST([INTERNAL_DEBUG_OUTPUT])

## These are all the packages that use H5*_DEBUG.
## There is no harm in specifying a package not in this list;
## you'll just get an unused H5<pkg>_DEBUG symbol.
##
## Some packages that define debug checks or output are
## too specialized or have huge performance hits. These
## are not listed in the "all" packages list.
##
## all_packages="AC,B2,CX,D,F,FA,FL,FS,MM,O,T,Z"
all_packages="AC,B2,CX,D,F,MM,O,T,Z"

case "X-$INTERNAL_DEBUG_OUTPUT" in
  X-yes|X-all)
    INTERNAL_DEBUG_OUTPUT=$all_packages
    DEBUG_PKG_LIST=$all_packages
    ;;
  X-no|X-none)
    INTERNAL_DEBUG_OUTPUT=none
    DEBUG_PKG_LIST=
    ;;
  *)
    DEBUG_PKG_LIST=$INTERNAL_DEBUG_OUTPUT
    ;;
esac
AC_MSG_RESULT([$INTERNAL_DEBUG_OUTPUT])

## Define H5*_DEBUG symbols that control package output
## NOTE: No sanity checking done here!
if test -n "$DEBUG_PKG_LIST"; then
  for pkg in `echo $DEBUG_PKG_LIST | ${TR} ${as_cr_letters}"," ${as_cr_LETTERS}" "`; do
    H5_CPPFLAGS="$H5_CPPFLAGS -DH5${pkg}_DEBUG"
  done
fi

## ----------------------------------------------------------------------
## Check if they would like the function stack support compiled in
##
AC_MSG_CHECKING([whether function stack tracking is enabled])
AC_ARG_ENABLE([codestack],
              [AS_HELP_STRING([--enable-codestack],
                              [Enable the function stack tracing (for developer debugging).
                               [default=no]
                              ])],
              [CODESTACK=$enableval])

## Set the default level.
if test "X-$CODESTACK" = X- ; then
  CODESTACK=no
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([CODESTACK])

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

## ----------------------------------------------------------------------
## Enable tracing of the API
##
AC_MSG_CHECKING([for API tracing]);
AC_ARG_ENABLE([trace],
              [AS_HELP_STRING([--enable-trace],
                              [Enable HDF5 API tracing capability.
                               [default=yes if debug build, otherwise no]
                               ])],
              [TRACE_API=$enableval])

## Set the default level.
if test "X-$TRACE_API" = X- ; then
  if test "X-$BUILD_MODE" = "X-debug" ; then
    TRACE_API=yes
  else
    TRACE_API=no
  fi
fi

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([TRACE_API])

case "X-$TRACE_API" in
  X-yes)
    AC_MSG_RESULT([yes])
    H5_CPPFLAGS="$H5_CPPFLAGS -DH5_DEBUG_API"
    ;;
  X-no)
    AC_MSG_RESULT([no])
    H5_CPPFLAGS="$H5_CPPFLAGS -UH5_DEBUG_API"
    ;;
  *)
    AC_MSG_ERROR([Unrecognized value: $TRACE_API])
    ;;
esac

## ----------------------------------------------------------------------
## Check if they would like to use a memory checking tool (like valgrind's
##     'memcheck' tool, or Rational Purify, etc) and the library should be
##     more scrupulous with it's memory operations.  Enabling this also
##     disables the library's free space manager code.
##
AC_MSG_CHECKING([whether a memory checking tool will be used])
AC_ARG_ENABLE([using-memchecker],
              [AS_HELP_STRING([--enable-using-memchecker],
                              [Enable this option if a memory allocation and/or
                              bounds checking tool will be used on the HDF5
                              library.  Enabling this causes the library to be
                              more picky about its memory operations and also
                              disables the library's free space manager code.
                              [default=no]
                              ])],
              [USINGMEMCHECKER=$enableval])

## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([USINGMEMCHECKER])

## Set the default level.
if test "X-$USINGMEMCHECKER" = X- ; then
  USINGMEMCHECKER=no
fi

case "X-$USINGMEMCHECKER" in
  X-yes)
      AC_DEFINE([USING_MEMCHECKER], [1],
                [Define if a memory checking tool will be used on the library,
                to cause library to be very picky about memory operations and
                also disable the internal free list manager code.])
      AC_MSG_RESULT([yes])
    ;;
  X-no)
      AC_MSG_RESULT([no])
    ;;
  *)
      AC_MSG_ERROR([Unrecognized value: $USINGMEMCHECKER])
    ;;
esac

## Checkpoint the cache
AC_CACHE_SAVE

## What header files and libraries do we have to look for for parallel
## support?  For the most part, search paths are already specified with
## CPPFLAGS and LDFLAGS or are known to the compiler.
##
AC_ARG_ENABLE([parallel],
              [AS_HELP_STRING([--enable-parallel],
                              [Search for MPI-IO and MPI support files])])

## The --enable-parallel flag is not compatible with --enable-cxx.
## If the user tried to specify both flags, throw an error, unless
## they also provided the --enable-unsupported flag.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${HDF_CXX}" = "Xyes" -a "X${enable_parallel}" = "Xyes"; then
    AC_MSG_ERROR([--enable-cxx and --enable-parallel flags are incompatible. Use --enable-unsupported to override this error.])
  fi
fi

## The --enable-parallel flag is not compatible with --enable-java.
## If the user tried to specify both flags, throw an error, unless
## they also provided the --enable-unsupported flag.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${HDF_JAVA}" = "Xyes" -a "X${enable_parallel}" = "Xyes"; then
    AC_MSG_ERROR([--enable-java and --enable-parallel flags are incompatible. Use --enable-unsupported to override this error.])
  fi
fi

# Requires MPI standard 3.0 and greater
if test "X${enable_parallel}" = "Xyes"; then
  AC_MSG_CHECKING([whether MPI meets the minimum 3.0 standard])
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #include <mpi.h>
       #if MPI_VERSION < 3
       #error, found MPI_VERSION < 3
       #endif]])],
       [AC_MSG_RESULT([yes])],
       [AC_MSG_RESULT([no])
       AC_MSG_ERROR([HDF5 requires MPI standard 3.0 or greater])]
  )
fi

AC_MSG_CHECKING([for parallel support files])
case "X-$enable_parallel" in
  X-|X-no|X-none)
    ## We are not compiling for parallel.
    AC_MSG_RESULT([skipped])
    ;;

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

    ## Try link a simple MPI program.
    AC_MSG_CHECKING([whether a simple MPI-IO C program can be linked])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <mpi.h>]],
                   [[ MPI_Init(0, (void *)0);
            MPI_File_open(0, (void *)0, 0, 0, (void *)0);]])],
        [AC_MSG_RESULT([yes])],
            [AC_MSG_RESULT([no])
            AC_MSG_ERROR([unable to link a simple MPI-IO C program])])

    if test "X$HDF_FORTRAN" = "Xyes"; then
      PAC_PROG_FC_MPI_CHECK
    fi

    ## Set RUNPARALLEL to mpiexec if not set yet.
    if test "X$PARALLEL" = "Xyes" -a -z "$RUNPARALLEL"; then
      RUNPARALLEL="mpiexec -n \$\${NPROCS:=6}"
    fi
    ;;

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

## ----------------------------------------------------------------------
## Print some other parallel information and do some sanity checks.
## Needs to be done outside of the PARALLEL block since the serial
## build also needs to have values defined.
##
AC_SUBST([ADD_PARALLEL_FILES]) ADD_PARALLEL_FILES="no"
AC_SUBST([INSTRUMENT_LIBRARY]) INSTRUMENT_LIBRARY=no
AC_SUBST([PARALLEL_FILTERED_WRITES])
AC_SUBST([LARGE_PARALLEL_IO])

if test -n "$PARALLEL"; then
  if test "X$HDF5_TESTS" = "Xyes"; then
    ## The 'testpar' directory should participate in the build
    TESTPARALLEL=testpar
  fi

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

  ## 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])

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

  ## If RUNSERIAL or RUNPARALLEL is the word `none' then replace it with
  ## the empty string. This means that no launch commands were requested,
  ## so we will not use any launch commands.
  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_LINK_IFELSE([AC_LANG_PROGRAM([[
    #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 exist])
                 AC_MSG_RESULT([yes])],
                 [AC_MSG_RESULT([no])]
    )

    AC_MSG_CHECKING([for MPI_Info_c2f and MPI_Info_f2c functions])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#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 exist])
                AC_MSG_RESULT([yes])],
                [AC_MSG_RESULT([no])]
    )

    AC_LANG_PUSH([Fortran])
    AC_MSG_CHECKING([for MPI-3 module mpi_f08])
    AC_LINK_IFELSE(
      [AC_LANG_PROGRAM([],
                       [
                        USE mpi_f08
                        IMPLICIT NONE
                        TYPE(MPI_Comm) :: comm
                        TYPE(MPI_INFO) :: info
                       ]
                      )
      ],
      [AC_DEFINE([HAVE_MPI_F08], [1],
                [Define if mpi_f08 module exist])
                AC_MSG_RESULT([yes])],
                [AC_MSG_RESULT([no])]
    )
    AC_LANG_POP(Fortran)
  fi

  ## ----------------------------------------------------------------------
  ## Enable instrumenting of the library's internal operations
  ## in parallel builds.
  ##

  ## Set default
  if test "X-$BUILD_MODE" = "X-debug" ; then
    INSTRUMENT_LIBRARY=yes
  else
    INSTRUMENT_LIBRARY=no
  fi

  AC_MSG_CHECKING([for instrumented library]);
  AC_ARG_ENABLE([instrument],
                [AS_HELP_STRING([--enable-instrument],
                                [Enable library instrumentation of optimization
                                  tracing (only used with parallel builds).
                                  [default=yes if a parallel debug build, otherwise no]
                                ])],
                [INSTRUMENT_LIBRARY=$enableval])

  ## Allow this variable to be substituted in
  ## other files (src/libhdf5.settings.in, etc.)
  AC_SUBST([INSTRUMENT_LIBRARY])

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

  ## ----------------------------------------------------------------------
  ## Check for the MPI functions necessary for the Parallel Compression
  ## feature. If these are not present, issue a warning that Parallel
  ## Compression will be disabled.
  ##
  AC_MSG_CHECKING([for MPI_Ibarrier/MPI_Issend/MPI_Iprobe/MPI_Irecv functions])

  AC_LINK_IFELSE(
      [AC_LANG_PROGRAM(
          [[
              #include <mpi.h>
          ]],
          [[
              int flag;
              MPI_Init(0, (void *) 0);
              MPI_Ibarrier(0, (void *) 0);
              MPI_Issend((void *) 0, 0, 0, 0, 0, 0, (void *) 0);
              MPI_Iprobe(0, 0, 0, &flag, (void *) 0);
              MPI_Irecv((void *) 0, 0, 0, 0, 0, 0, (void *) 0);
          ]]
      )],
      [AC_MSG_RESULT([yes])
       PARALLEL_FILTERED_WRITES=yes
       AC_DEFINE([HAVE_PARALLEL_FILTERED_WRITES], [1], [Define if we have support for writing to filtered datasets in parallel])],
      [AC_MSG_RESULT([no])
       AC_MSG_WARN([A simple MPI program using the MPI_Ibarrier, MPI_Issend, MPI_Iprobe and MPI_Irecv functions could not be compiled and linked.
                    Parallel writes of filtered data will be disabled.])
       PARALLEL_FILTERED_WRITES=no]
  )

  ## ----------------------------------------------------------------------
  ## Check for the MPI-3 functions necessary for the big I/O feature.
  ## If these are not present, issue a warning that the big I/O feature
  ## will be disabled.
  ##
  AC_MSG_CHECKING([for MPI_Get_elements_x and MPI_Type_size_x functions])

  AC_LINK_IFELSE(
      [AC_LANG_PROGRAM(
          [[
              #include <mpi.h>
          ]],
          [[
              MPI_Count count;
              MPI_Init(0, (void *) 0);
              MPI_Get_elements_x(0, 0, &count);
              MPI_Type_size_x(0, &count);
          ]]
      )],
      [AC_MSG_RESULT([yes])
       LARGE_PARALLEL_IO=yes],
      [AC_MSG_RESULT([no])
       AC_MSG_WARN([A simple MPI program using the MPI_Get_elements_x and MPI_Type_size_x functions could not be compiled and linked.
                    Reading/Writing >2GB of data in a single parallel I/O operation will be disabled.])
       LARGE_PARALLEL_IO=no]
  )

fi

## ----------------------------------------------------------------------

## Build parallel tools if parallel tools, parallel, and build tools options
## are all enabled.
##
AC_SUBST([PARALLEL_TOOLS])

## Default is no parallel tools
PARALLEL_TOOLS=no

AC_MSG_CHECKING([parallel tools])
AC_ARG_ENABLE([parallel-tools],
              [AS_HELP_STRING([--enable-parallel-tools],
                              [Enable building parallel tools.
                              [default=no]])],
              [PARALLEL_TOOLS=$enableval])

if test "X${PARALLEL_TOOLS}" = "Xyes"; then
  if test "X${HDF5_TOOLS}" != "Xyes"; then
    AC_MSG_ERROR([--enable-tools is required for --enable-parallel-tools])
  fi
  if test "X${PARALLEL}" != "Xyes"; then
    AC_MSG_ERROR([--enable-parallel is required for --enable-parallel-tools])
  fi
fi

case "X-$PARALLEL_TOOLS" in
  X-|X-no)
    AC_MSG_RESULT([no])
  ;;
  X-yes)
    AC_MSG_RESULT([yes])
  ;;
  *)
  ;;
esac

if test "X${PARALLEL_TOOLS}" = "Xyes"; then
  ## Is the mpiFileUtils library (libmfu) required and available?
  ##
  AC_SUBST([H5DWALK_LDFLAGS])
  AC_SUBST([H5DWALK_LIBS])
  AC_SUBST([H5DWALK_CPPFLAGS])

  H5DWALK_LDFLAGS="${H5DWALK_LDFLAGS}"

  ## Default is not present
  HAVE_LIBMFU=no

  AC_ARG_WITH([libmfu],
              [AS_HELP_STRING([--with-libmfu=DIR],
                              [Use the libmfu library [default=no]])],,
              [withval=no])

  case "X-$withval" in
    X-yes)
      HAVE_LIBMFU="yes"
      AC_CHECK_HEADERS([mfu.h],, [unset HAVE_LIBMFU])
      if test "x$HAVE_LIBMFU" = "xyes"; then
        AC_CHECK_LIB([mfu], [mfu_init], [H5DWALK_LIBS="-lmfu"], [unset HAVE_LIBMFU])
      fi
      if test -z "$HAVE_LIBMFU" -a -n "$HDF5_CONFIG_ABORT"; then
        AC_MSG_ERROR([couldn't find libmfu library])
      fi
      ;;
    X-|X-no|X-none)
      HAVE_LIBMFU="no"
      AC_MSG_CHECKING([for libmfu library])
      AC_MSG_RESULT([suppressed])
      ;;
    *)
      HAVE_LIBMFU="yes"
      case "$withval" in
        *,*)
          libmfu_inc="`echo $withval |cut -f1 -d,`"
          libmfu_lib="`echo $withval |cut -f2 -d, -s`"
          ;;
        *)
          if test -n "$withval"; then
            libmfu_inc="$withval/include"
            libmfu_lib="$withval/lib64"
            libcircle_lib="$withval/lib"
          fi
          ;;
      esac

      saved_CPPFLAGS="$CPPFLAGS"
      saved_AM_CPPFLAGS="$AM_CPPFLAGS"
      saved_LDFLAGS="$LDFLAGS"
      saved_AM_LDFLAGS="$AM_LDFLAGS"

  ## For these checks we need the libmfu locations added to CPPFLAGS,
  ## AM_CPPFLAGS, LDFLAGS, and AM_LDFLAGS.  The third param should set them
  ## back to these saved values.  If the checks pass, then normally these four
  ## flag variables would be updated, but in this case we put the changes in
  ## variables specific to H5DWALK since they aren't used elsewhere.
    if test -n "$libmfu_inc"; then
      CPPFLAGS="$CPPFLAGS -I$libmfu_inc"
      AM_CPPFLAGS="$AM_CPPFLAGS -I$libmfu_inc"
    fi

    if test -n "$libmfu_lib"; then
      LDFLAGS="$LDFLAGS -L$libmfu_lib -L$libcircle_lib"
      AM_LDFLAGS="$AM_LDFLAGS -L$libmfu_lib -L$libcircle_lib"
    fi

    if test "x$HAVE_LIBMFU" = "xyes"; then
      AC_CHECK_LIB([mfu], [mfu_init],[H5DWALK_LIBS="-lmfu"], [CPPFLAGS="$saved_CPPFLAGS"; AM_CPPFLAGS="$saved_AM_CPPFLAGS"; LDFLAGS="$saved_LDFLAGS"; AM_LDFLAGS="$saved_AM_LDFLAGS"; unset HAVE_LIBMFU])
      if test -n "$HAVE_LIBMFU"; then
        AC_CHECK_HEADERS([mfu.h],[H5DWALK_CPPFLAGS="-I$libmfu_inc"],[CPPFLAGS="$saved_CPPFLAGS"; AM_CPPFLAGS="$saved_AM_CPPFLAGS"; LDFLAGS="$saved_LDFLAGS"; AM_LDFLAGS="$saved_AM_LDFLAGS"; unset HAVE_LIBMFU])
      fi
    fi

    if test -z "$HAVE_LIBMFU" -a -n "$HDF5_CONFIG_ABORT"; then
      AC_MSG_ERROR([couldn't find libmfu library])
    else
      H5DWALK_LDFLAGS="-L$libmfu_lib -L$libcircle_lib"
    fi

    if test -z  "$LD_LIBRARY_PATH"; then
      export LD_LIBRARY_PATH="$libmfu_lib:$libcircle_lib"
    else
      export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$libmfu_lib:$libcircle_lib"
    fi

    LL_PATH="$LD_LIBRARY_PATH"
    ;;
  esac
fi

##
AM_CONDITIONAL([PARALLEL_TOOLS_CONDITIONAL], [test "X$HAVE_LIBMFU" = "Xyes"])

## ----------------------------------------------------------------------
## Check if the map API is enabled by --enable-map-api
##
AC_SUBST([MAP_API])

## Default is no map API
MAP_API=no

AC_MSG_CHECKING([if the map API (H5M) is enabled])

AC_ARG_ENABLE([map-api],
              [AS_HELP_STRING([--enable-map-api],
                              [Build the map API (H5M).
                               This is not yet supported in the native file format
                               and requires a VOL connector that supports it.
                               [default=no]])],
              [MAP_API=$enableval], [MAP_API=no])

if test "X$MAP_API" = "Xyes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE([HAVE_MAP_API], [1],
            [Define if the map API (H5M) should be compiled])
else
    AC_MSG_RESULT([no])
fi

## ----------------------------------------------------------------------
## Check if Subfiling I/O driver is enabled by --enable-subfiling-vfd
##
AC_SUBST([SUBFILING_VFD])
AC_SUBST([HAVE_MERCURY])

## Default is no subfiling VFD
SUBFILING_VFD=no
HAVE_MERCURY="no"

## Always include subfiling directory so public header files are available
H5_CPPFLAGS="$H5_CPPFLAGS -I$ac_abs_confdir/src/H5FDsubfiling"

AC_MSG_CHECKING([if the subfiling I/O virtual file driver (VFD) is enabled])

AC_ARG_ENABLE([subfiling-vfd],
              [AS_HELP_STRING([--enable-subfiling-vfd],
                              [Build the subfiling I/O virtual file driver (VFD). Requires --enable-parallel.
                               [default=no]])],
              [SUBFILING_VFD=$enableval], [SUBFILING_VFD=no])

if test "X$SUBFILING_VFD" = "Xyes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE([HAVE_SUBFILING_VFD], [1],
            [Define if the subfiling I/O virtual file driver (VFD) should be compiled])
    AC_DEFINE([HAVE_IOC_VFD], [1],
            [Define if the I/O Concentrator virtual file driver (VFD) should be compiled])

    if test "X${PARALLEL}" != "Xyes"; then
      AC_MSG_ERROR([--enable-parallel is required for --enable-subfiling-vfd])
    fi

    ## ----------------------------------------------------------------------
    ## Check for MPI_Comm_split_type availability
    ##
    AC_MSG_CHECKING([for MPI_Comm_split_type function])

    AC_LINK_IFELSE(
      [AC_LANG_PROGRAM(
          [[
              #include <mpi.h>
          ]],
          [[
              MPI_Comm intra_comm;
              MPI_Init(0, (void *) 0);
              MPI_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, 0, MPI_INFO_NULL, &intra_comm);
          ]]
      )],
      [AC_MSG_RESULT([yes])],
      [AC_MSG_RESULT([no])
       AC_MSG_ERROR([unable to link MPI program that uses MPI_Comm_split_type])
       ]
    )

    # Set-up mercury
    HAVE_MERCURY="yes"
    mercury_dir="$ac_abs_confdir/src/H5FDsubfiling/mercury"
    mercury_inc="$mercury_dir/src/util"

    H5_CPPFLAGS="$H5_CPPFLAGS -I$mercury_inc"

    HAVE_STDATOMIC_H="yes"
    AC_CHECK_HEADERS([stdatomic.h],,[HAVE_STDATOMIC_H="no"])
    if test "x$HAVE_STDATOMIC_H" = "xno"; then
      AC_MSG_ERROR([Subfiling VFD requires atomic operations support. C11 stdatomic.h NOT available.])
    fi

    # Checks for libraries.
    AC_SEARCH_LIBS([shm_open], [rt])
    AC_CHECK_LIB([pthread], [pthread_self],[], [echo "Error: Required library pthread not found." && exit 1])

    # Perform various checks for Mercury util code
    AC_CHECK_DECL([PTHREAD_MUTEX_ADAPTIVE_NP],
                  [AC_DEFINE([HAVE_PTHREAD_MUTEX_ADAPTIVE_NP], [1],
                      [Define if has PTHREAD_MUTEX_ADAPTIVE_NP])],
                  [],
                  [[#include <pthread.h>]])
    AC_CHECK_DECL([pthread_condattr_setclock],
                  [AC_DEFINE([HAVE_PTHREAD_CONDATTR_SETCLOCK], [1],
                      [Define if has pthread_condattr_setclock()])],
                  [],
                  [[#include <pthread.h>]])
    AC_CHECK_DECL([CLOCK_MONOTONIC_COARSE],
                  [AC_DEFINE([HAVE_CLOCK_MONOTONIC_COARSE], [1],
                      [Define if has CLOCK_MONOTONIC_COARSE])],
                  [],
                  [[#include <time.h>]])

else
    AC_MSG_RESULT([no])
fi

## Subfiling and IOC VFD files are not built if not required.
AM_CONDITIONAL([SUBFILING_VFD_CONDITIONAL], [test "X$SUBFILING_VFD" = "Xyes"])
# IOC VFD is currently only built when subfiling is enabled
AM_CONDITIONAL([IOC_VFD_CONDITIONAL], [test "X$SUBFILING_VFD" = "Xyes"])
# Mercury is currently only needed if  subfiling is enabled
AM_CONDITIONAL([HAVE_MERCURY_CONDITIONAL], [test "X$HAVE_MERCURY" = "Xyes"])


## ----------------------------------------------------------------------
## Check if Direct I/O driver is enabled by --enable-direct-vfd
##
AC_SUBST([DIRECT_VFD])

## Default is no direct VFD
DIRECT_VFD=no

AC_CACHE_VAL([hdf5_cv_direct_io],
    AC_CHECK_DECL([O_DIRECT], [hdf5_cv_direct_io=yes], [hdf5_cv_direct_io=no], [[#include <fcntl.h>]]))
AC_CACHE_VAL([hdf5_cv_posix_memalign],
    AC_CHECK_FUNC([posix_memalign], [hdf5_cv_posix_memalign=yes], [hdf5_cv_posix_memalign=no]))

AC_MSG_CHECKING([if the direct I/O virtual file driver (VFD) is enabled])

AC_ARG_ENABLE([direct-vfd],
              [AS_HELP_STRING([--enable-direct-vfd],
                              [Build the direct I/O virtual file driver (VFD).
                               This is based on the POSIX (sec2) VFD and
                               requires the open() call to take the O_DIRECT
                               flag. [default=no]])],
              [DIRECT_VFD=$enableval], [DIRECT_VFD=no])

if test "X$DIRECT_VFD" = "Xyes"; then
    if test ${hdf5_cv_direct_io} = "yes" && test ${hdf5_cv_posix_memalign} = "yes" ; then
        AC_MSG_RESULT([yes])
        AC_DEFINE([HAVE_DIRECT], [1],
                [Define if the direct I/O virtual file driver (VFD) should be compiled])
    else
        AC_MSG_RESULT([no])
        DIRECT_VFD=no
        AC_MSG_ERROR([The direct VFD was requested but cannot be built. This is either
                     due to O_DIRECT not being found in fcntl.h or a lack of
                     posix_memalign() on your system. Please re-configure without
                     specifying --enable-direct-vfd.])
    fi
else
    AC_MSG_RESULT([no])
fi

## Direct VFD files are not built if not required.
AM_CONDITIONAL([DIRECT_VFD_CONDITIONAL], [test "X$DIRECT_VFD" = "Xyes"])

## ----------------------------------------------------------------------
## Check whether the Mirror VFD can be built.
## Auto-enabled if the required libraries are present.
##
AC_SUBST([MIRROR_VFD])

## Default is no Mirror VFD
MIRROR_VFD=no

AC_ARG_ENABLE([mirror-vfd],
              [AS_HELP_STRING([--enable-mirror-vfd],
                              [Build the socket-based Mirror virtual file driver (VFD).
                               [default=no]])],
              [MIRROR_VFD=$enableval], [MIRROR_VFD=no])

if test "X$MIRROR_VFD" = "Xyes"; then

    AC_CHECK_HEADERS([arpa/inet.h],, [unset MIRROR_VFD])
    AC_CHECK_HEADERS([netinet/in.h],, [unset MIRROR_VFD])
    AC_CHECK_HEADERS([netdb.h],, [unset MIRROR_VFD])
    AC_CHECK_HEADERS([sys/socket.h],, [unset MIRROR_VFD])
    AC_CHECK_FUNC([fork], [], [unset MIRROR_VFD])

    AC_MSG_CHECKING([if the Mirror virtual file driver (VFD) can be built])
    if test "X$MIRROR_VFD" = "Xyes"; then
        AC_DEFINE([HAVE_MIRROR_VFD], [1],
                [Define whether the Mirror virtual file driver (VFD) will be compiled])
        AC_MSG_RESULT([yes])
    else
        AC_MSG_RESULT([no])
        MIRROR_VFD=no
        AC_MSG_ERROR([The Mirror VFD cannot be built.
                      Missing one or more of: arpa/inet.h, netinet/in.h,
                      netdb.h, sys/socket.h, fork().])
    fi
else
    AC_MSG_CHECKING([if the Mirror virtual file driver (VFD) is enabled])
    AC_MSG_RESULT([no])
    MIRROR_VFD=no
fi

## Mirror VFD files built only if able.
AM_CONDITIONAL([MIRROR_VFD_CONDITIONAL], [test "X$MIRROR_VFD" = "Xyes"])

## ----------------------------------------------------------------------
## Check if Read-Only S3 virtual file driver is enabled by --enable-ros3-vfd
##
AC_SUBST([ROS3_VFD])

## Default is no Read-Only S3 VFD
ROS3_VFD=no

AC_ARG_ENABLE([ros3-vfd],
              [AS_HELP_STRING([--enable-ros3-vfd],
                              [Build the Read-Only S3 virtual file driver (VFD).
                               [default=no]])],
              [ROS3_VFD=$enableval], [ROS3_VFD=no])

if test "X$ROS3_VFD" = "Xyes"; then
    AC_CHECK_HEADERS([curl/curl.h],, [unset ROS3_VFD])
    AC_CHECK_HEADERS([openssl/evp.h],, [unset ROS3_VFD])
    AC_CHECK_HEADERS([openssl/hmac.h],, [unset ROS3_VFD])
    AC_CHECK_HEADERS([openssl/sha.h],, [unset ROS3_VFD])
    if test "X$ROS3_VFD" = "Xyes"; then
        AC_CHECK_LIB([curl], [curl_global_init],, [unset ROS3_VFD])
        AC_CHECK_LIB([crypto], [EVP_sha256],, [unset ROS3_VFD])
    fi

    AC_MSG_CHECKING([if the Read-Only S3 virtual file driver (VFD) is enabled])
    if test "X$ROS3_VFD" = "Xyes"; then
        AC_DEFINE([HAVE_ROS3_VFD], [1],
                [Define whether the Read-Only S3 virtual file driver (VFD) should be compiled])
        AC_MSG_RESULT([yes])
    else
        AC_MSG_RESULT([no])
        ROS3_VFD=no
        AC_MSG_ERROR([The Read-Only S3 VFD was requested but cannot be built.
                      Please check that openssl and cURL are available on your
                      system, and/or re-configure without option
                      --enable-ros3-vfd.])
    fi
else
    AC_MSG_CHECKING([if the Read-Only S3 virtual file driver (VFD) is enabled])
    AC_MSG_RESULT([no])
    ROS3_VFD=no

fi

## Read-only S3 files are not built if not required.
AM_CONDITIONAL([ROS3_VFD_CONDITIONAL], [test "X$ROS3_VFD" = "Xyes"])


## ----------------------------------------------------------------------
## Is libhdfs (Hadoop Distributed File System) present?
## It might be specified with the `--with-libhdfs' command-line switch.
## If found, enables the HDFS VFD.
##
AC_SUBST([HAVE_LIBHDFS])
AC_ARG_WITH([libhdfs],
            [AS_HELP_STRING([--with-libhdfs=DIR],
                            [Provide libhdfs library to enable HDFS virtual file driver (VFD) [default=no]])],,
            [withval=no])

case $withval in
  no)
    HAVE_LIBHDFS="no"
    AC_MSG_CHECKING([for libhdfs])
    AC_MSG_RESULT([suppressed])
    ;;
  *)
    HAVE_LIBHDFS="yes"
    case "$withval" in
      *,*)
        libhdfs_inc="`echo $withval |cut -f1 -d,`"
        libhdfs_lib="`echo $withval |cut -f2 -d, -s`"
        ;;
      yes)
        libhdfs_inc="$HADOOP_HOME/include"
        libhdfs_lib="$HADOOP_HOME/lib"
        ;;
      *)
        if test -n "$withval"; then
          libhdfs_inc="$withval/include"
          libhdfs_lib="$withval/lib"
        fi
        ;;
    esac

    if test -n "$libhdfs_inc"; then
      CPPFLAGS="$CPPFLAGS -I$libhdfs_inc"
      AM_CPPFLAGS="$AM_CPPFLAGS -I$libhdfs_inc"
    fi
    AC_CHECK_HEADERS([hdfs.h],,
                     [unset HAVE_LIBHDFS])

    if test "x$HAVE_LIBHDFS" = "xyes"; then
      dnl Check for '-ljvm' needed by libhdfs
      JNI_LDFLAGS=""
      if test $JAVA_HOME != ""
      then
        JNI_LDFLAGS="-L$JAVA_HOME/jre/lib/$OS_ARCH -L$JAVA_HOME/jre/lib/$OS_ARCH/server"
      fi
      ldflags_bak=$LDFLAGS
      LDFLAGS="$LDFLAGS $JNI_LDFLAGS"
      AC_CHECK_LIB([jvm], [JNI_GetCreatedJavaVMs])
      LDFLAGS=$ldflags_bak
      AC_SUBST([JNI_LDFLAGS])
      if test -n "$libhdfs_lib"; then
        ## Hadoop distribution hides libraries down one level in 'lib/native'
        libhdfs_lib="$libhdfs_lib/native"
        LDFLAGS="$LDFLAGS -L$libhdfs_lib $JNI_LDFLAGS"
        AM_LDFLAGS="$AM_LDFLAGS -L$libhdfs_lib $JNI_LDFLAGS"
      fi
      AC_CHECK_LIB([hdfs], [hdfsConnect],,
                   [unset HAVE_LIBHDFS])
    fi

    if test -z "$HAVE_LIBHDFS"; then
      AC_MSG_ERROR([Set to use libhdfs library, but could not find or use
                    libhdfs. Please verify that the path to HADOOP_HOME is
                    valid, and/or reconfigure without --with-libhdfs.])
    fi
    ;;
esac

if test "x$HAVE_LIBHDFS" = "xyes"; then
  AC_DEFINE([HAVE_LIBHDFS], [1],
            [Proceed to build with libhdfs])
fi

## Read-only HDFS files are not built if not required.
AM_CONDITIONAL([HDFS_VFD_CONDITIONAL], [test "X$HAVE_LIBHDFS" = "Xyes"])

## Checkpoint the cache
AC_CACHE_SAVE

## ----------------------------------------------------------------------
## Use custom examples path.
##
AC_MSG_CHECKING([for custom examples path definition])
AC_ARG_WITH([examplesdir],
            [AS_HELP_STRING([--with-examplesdir=location],
                            [Specify path for examples
                            [default="DATAROOTDIR/hdf5_examples"]])],,
            withval="${datarootdir}/hdf5_examples")

if test "X$withval" = "X"; then
    AC_MSG_RESULT([default])
    examplesdir="${datarootdir}/hdf5_examples"
else
    AC_MSG_RESULT([$withval])
    examplesdir=$withval
fi

AC_SUBST([examplesdir])
AC_DEFINE_UNQUOTED([EXAMPLESDIR], ["$examplesdir"],
            [Define the examples directory])

## ----------------------------------------------------------------------
## Enable custom plugin default path for library.  It requires SHARED support.
##
AC_MSG_CHECKING([for custom plugin default path definition])
AC_ARG_WITH([default-plugindir],
            [AS_HELP_STRING([--with-default-plugindir=location],
                            [Specify default location for plugins
                            [default="/usr/local/hdf5/lib/plugin"]])],,
            withval="/usr/local/hdf5/lib/plugin")

if test "X$withval" = "X"; then
    AC_MSG_RESULT([default])
    default_plugindir="/usr/local/hdf5/lib/plugin"
else
    AC_MSG_RESULT([$withval])
    default_plugindir=$withval
fi

AC_DEFINE_UNQUOTED([DEFAULT_PLUGINDIR], ["$default_plugindir"],
            [Define the default plugins path to compile])

## ----------------------------------------------------------------------
## Decide whether the presence of user's exception handling functions is
## checked and data conversion exceptions are returned.  This is mainly
## for the speed optimization of hard conversions.  Soft conversions can
## actually benefit little.
##
AC_MSG_CHECKING([whether exception handling functions is checked during data conversions])
AC_ARG_ENABLE([dconv-exception],
              [AS_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

## ----------------------------------------------------------------------
## Decide whether the data accuracy has higher priority during data
## conversions.  If not, some hard conversions will still be preferred even
## though the data may be wrong (for example, some compilers don't
## support denormalized floating values) to maximize speed.
##
AC_MSG_CHECKING([whether data accuracy is guaranteed during data conversions])
AC_ARG_ENABLE([dconv-accuracy],
              [AS_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 preferred to speed during data conversions])
else
  AC_MSG_RESULT([no])
fi

## ----------------------------------------------------------------------
## Set the flag to indicate that the machine has window style pathname,
## that is, "drive-letter:\" (e.g. "C:") or "drive-letter:/" (e.g. "C:/").
## (This flag should be _unset_ for all machines, except for Windows, where
## it's set in the custom Windows H5pubconf.h file)
##
AC_MSG_CHECKING([if the machine has window style path name])

case "`uname`" in
  MINGW*)
    AC_DEFINE([HAVE_WINDOW_PATH], [1],
              [Define if your system has window style path name.])
    AC_MSG_RESULT([yes])
    ;;
  *)
    AC_MSG_RESULT([no])
    ;;
esac

## ----------------------------------------------------------------------
## Set the flag to indicate that the machine is using a special algorithm to convert
## 'long double' to '(unsigned) long' values.  (This flag should only be set for
## the IBM Power Linux.  When the bit sequence of long double is
## 0x4351ccf385ebc8a0bfcc2a3c3d855620, the converted value of (unsigned)long
## is 0x004733ce17af227f, not the same as the library's conversion to 0x004733ce17af2282.
## The machine's conversion gets the correct value.  We define the macro and disable
## this kind of test until we figure out what algorithm they use.
##
## CROSS-COMPILING: Assume 'no'
AC_MSG_CHECKING([if using special algorithm to convert long double to (unsigned) long values])

## NOTE: Place all configure test programs into cmake's source file, then use a preprocessor directive
## to select the proper test program. This is done by echoing the #define and cat'ing the cmake
## source file. (HDFFV-9467)

TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_LONG_SPECIAL_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_ldouble_to_long_special=${hdf5_cv_ldouble_to_long_special=no}
else
   AC_CACHE_VAL([hdf5_cv_ldouble_to_long_special],
        [AC_RUN_IFELSE(
            [AC_LANG_SOURCE([$TEST_SRC])]
    , [hdf5_cv_ldouble_to_long_special=yes], [hdf5_cv_ldouble_to_long_special=no], [hdf5_cv_ldouble_to_long_special=no])])
fi

if test ${hdf5_cv_ldouble_to_long_special} = "yes"; then
  AC_DEFINE([LDOUBLE_TO_LONG_SPECIAL], [1],
            [Define if your system converts long double to (unsigned) long values with special algorithm.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

## ----------------------------------------------------------------------
## Set the flag to indicate that the machine is using a special algorithm
## to convert some values of '(unsigned) long' to 'long double' values.
## (This flag should be off for all machines, except for IBM Power Linux,
## when the bit sequences are 003fff..., 007fff..., 00ffff..., 01ffff...,
## ..., 7fffff..., the compiler uses a unknown algorithm.  We define a
## macro and skip the test for now until we know about the algorithm.
##
## CROSS-COMPILING: Assume 'no'
AC_MSG_CHECKING([if using special algorithm to convert (unsigned) long to long double values])

TEST_SRC="`(echo \"#define H5_LONG_TO_LDOUBLE_SPECIAL_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_long_to_ldouble_special=${hdf5_cv_long_to_ldouble_special=no}
else
   AC_CACHE_VAL([hdf5_cv_long_to_ldouble_special],
        [AC_RUN_IFELSE(
            [AC_LANG_SOURCE([$TEST_SRC])]
    , [hdf5_cv_long_to_ldouble_special=yes], [hdf5_cv_long_to_ldouble_special=no], [hdf5_cv_long_to_ldouble_special=no])])
fi

if test ${hdf5_cv_long_to_ldouble_special} = "yes"; then
  AC_DEFINE([LONG_TO_LDOUBLE_SPECIAL], [1],
            [Define if your system can convert (unsigned) long to long double values with special algorithm.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

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

TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_LLONG_ACCURATE_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_ldouble_to_llong_accurate=${hdf5_cv_ldouble_to_llong_accurate=no}
else
   AC_CACHE_VAL([hdf5_cv_ldouble_to_llong_accurate],
        [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])],
        [hdf5_cv_ldouble_to_llong_accurate=yes], [hdf5_cv_ldouble_to_llong_accurate=no], [hdf5_cv_ldouble_to_llong_accurate=yes])])
fi

if test ${hdf5_cv_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


## ----------------------------------------------------------------------
## Set the flag to indicate that the machine can accurately convert
## '(unsigned) long long' to 'long double' values.  (This flag should be
## set for all machines, except for Mac OS 10.4 and Powerpc Linux using
## XL compilers.
## When the bit sequences are 003fff..., 007fff..., 00ffff..., 01ffff...,
## ..., 7fffff..., the converted values are twice as big as they should be.
##
## CROSS-COMPILING: Assume 'yes'
AC_MSG_CHECKING([if correctly converting (unsigned) long long to long double values])

TEST_SRC="`(echo \"#define H5_LLONG_TO_LDOUBLE_CORRECT_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_llong_to_ldouble_correct=${hdf5_cv_llong_to_ldouble_correct=no}
else
   AC_CACHE_VAL([hdf5_cv_llong_to_ldouble_correct],
        [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])],
        [hdf5_cv_llong_to_ldouble_correct=yes], [hdf5_cv_llong_to_ldouble_correct=no], [hdf5_cv_llong_to_ldouble_correct=yes])])
fi

if test ${hdf5_cv_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

## ----------------------------------------------------------------------
## Set the flag to indicate that the machine is IBM ppc64le and cannot
## accurately convert some long double values.
##
## CROSS-COMPILING: Assume 'yes'
AC_MSG_CHECKING([if the system is IBM ppc64le and cannot correctly convert some long double values])

TEST_SRC="`(echo \"#define H5_DISABLE_SOME_LDOUBLE_CONV_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"

if test ${ac_cv_sizeof_long_double} = 0; then
   hdf5_cv_disable_some_ldouble_conv=${hdf5_cv_disable_some_ldouble_conv=no}
else
   AC_CACHE_VAL([hdf5_cv_disable_some_ldouble_conv],
        [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])],
        [hdf5_cv_disable_some_ldouble_conv=yes], [hdf5_cv_disable_some_ldouble_conv=no], [hdf5_cv_disable_some_ldouble_conv=yes])])
fi

if test ${hdf5_cv_disable_some_ldouble_conv} = "yes"; then
  AC_DEFINE([DISABLE_SOME_LDOUBLE_CONV], [1],
            [Define if your system is IBM ppc64le and cannot convert some long double values correctly.])
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

## ----------------------------------------------------------------------
## Set some variables for general configuration information to be saved
## and installed with the libraries (used to generate libhdf5.settings).
##

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

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

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

## Configuration mode (production, debug, etc.) saved above.
AC_SUBST([CONFIG_MODE])

## 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


if test "X$ac_cv_c_bigendian" = "Xyes"; then
  WORDS_BIGENDIAN="yes"
else
  WORDS_BIGENDIAN="no"
fi
AC_SUBST([WORDS_BIGENDIAN])

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

## Parallel writes to filtered datasets support?
PARALLEL_FILTERED_WRITES=${PARALLEL_FILTERED_WRITES:-no}

## >2GB writes in parallel support?
LARGE_PARALLEL_IO=${LARGE_PARALLEL_IO:-no}

## Compiler with version information. This consists of the full path
## name of the compiler and the reported version number.
AC_SUBST([CC_VERSION])
## 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_NOFLAGS; then
      CC_VERSION="$x/$CC"
      break
    fi
  done
fi
if test -n "$cc_version_info"; then
  CC_VERSION="$CC_VERSION ( $cc_version_info)"
fi

AC_SUBST([FC_VERSION])
## Strip anything that looks like a flag off of $FC
FC_NOFLAGS=`echo $FC | sed 's/ -.*//'`

if `echo $FC_NOFLAGS | grep ^/ >/dev/null 2>&1`; then
  FC_VERSION="$FC"
else
  FC_VERSION="$FC";
  for x in `echo $PATH | sed -e 's/:/ /g'`; do
    if test -x $x/$FC_NOFLAGS; then
      FC_VERSION="$x/$FC"
      break
    fi
  done
fi
if test -n "$fc_version_info"; then
  FC_VERSION="$FC_VERSION ( $fc_version_info)"
fi

AC_SUBST([CXX_VERSION])
## Strip anything that looks like a flag off of $CXX
CXX_NOFLAGS=`echo $CXX | sed 's/ -.*//'`

if `echo $CXX_NOFLAGS | grep ^/ >/dev/null 2>&1`; then
  CXX_VERSION="$CXX"
else
  CXX_VERSION="$CXX";
  for x in `echo $PATH | sed -e 's/:/ /g'`; do
    if test -x $x/$CXX_NOFLAGS; then
      CXX_VERSION="$x/$CXX"
      break
    fi
  done
fi
if test -n "$cxx_version_info"; then
  CXX_VERSION="$CXX_VERSION ( $cxx_version_info)"
fi

AC_SUBST([JAVA_VERSION])
## Strip anything that looks like a flag off of $JAVA
JAVA_NOFLAGS=`echo $JAVA | sed 's/ -.*//'`

if `echo $JAVA_NOFLAGS | grep ^/ >/dev/null 2>&1`; then
  JAVA_VERSION="$JAVA"
else
  JAVA_VERSION="$JAVA";
  for x in `echo $PATH | sed -e 's/:/ /g'`; do
    if test -x $x/$JAVA_NOFLAGS; then
      JAVA_VERSION="$x/$JAVA"
      break
    fi
  done
fi
java_version_info=`$JAVA -version 2>&1 |\
  grep 'version' | sed -e 's/version "//' | sed -e 's/"//'`
if test -n "$java_version_info"; then
  JAVA_VERSION="$JAVA_VERSION ($java_version_info)"
fi

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

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

## ----------------------------------------------------------------------
## Enable deprecated public API symbols
##

## Enabled unless the build mode is clean.
if test "X-$BUILD_MODE" = "X-clean" ; then
  DEPREC_SYMBOLS=no
else
  DEPREC_SYMBOLS=yes
fi

AC_SUBST([DEPRECATED_SYMBOLS])
AC_MSG_CHECKING([if deprecated public symbols are available]);
AC_ARG_ENABLE([deprecated-symbols],
              [AS_HELP_STRING([--enable-deprecated-symbols],
                     [Enable deprecated public API symbols.
                     [default=yes (unless build mode = clean)]
                     ])],
              [DEPREC_SYMBOLS=$enableval])

case "X-$DEPREC_SYMBOLS" in
  X-yes)
    AC_MSG_RESULT([yes])
    DEPRECATED_SYMBOLS=yes
    ;;
  X-no|*)
    AC_MSG_RESULT([no])
    DEPRECATED_SYMBOLS=no
    AC_DEFINE([NO_DEPRECATED_SYMBOLS], [1],
              [Define if deprecated public API symbols are disabled])
    ;;
esac

## --------------------------------------------------------------------------
## Which version of the public APIs should the 'base' versioned symbols use?
##

AC_SUBST([DEFAULT_API_VERSION])
AC_MSG_CHECKING([which version of public symbols to use by default])
AC_ARG_WITH([default-api-version],
            [AS_HELP_STRING([--with-default-api-version=(default|v16|v18|v110|v112|v114|v116)],
                            [Specify default release version of public symbols
                             [default=v116]])],,
            [withval=v116])

## Allowing "default" allows the GitHub CI to check that we didn't forget
## to change the defaults when creating a new major version
if test "X$withval" = "Xv16"; then
    AC_MSG_RESULT([v16])
    DEFAULT_API_VERSION=v16
    AC_DEFINE([USE_16_API_DEFAULT], [1],
              [Define using v1.6 public API symbols by default])
elif test "X$withval" = "Xv18"; then
    AC_MSG_RESULT([v18])
    DEFAULT_API_VERSION=v18
    AC_DEFINE([USE_18_API_DEFAULT], [1],
              [Define using v1.8 public API symbols by default])
elif test "X$withval" = "Xv110"; then
    AC_MSG_RESULT([v110])
    DEFAULT_API_VERSION=v110
    AC_DEFINE([USE_110_API_DEFAULT], [1],
              [Define using v1.10 public API symbols by default])
elif test "X$withval" = "Xv112"; then
    AC_MSG_RESULT([v112])
    DEFAULT_API_VERSION=v112
    AC_DEFINE([USE_112_API_DEFAULT], [1],
              [Define using v1.12 public API symbols by default])
elif test "X$withval" = "Xv114"; then
    AC_MSG_RESULT([v114])
    DEFAULT_API_VERSION=v114
    AC_DEFINE([USE_114_API_DEFAULT], [1],
              [Define using v1.14 public API symbols by default])
elif test "X$withval" = "Xv116" -o "X$withval" = "Xdefault"; then
    AC_MSG_RESULT([v116])
    DEFAULT_API_VERSION=v116
    AC_DEFINE([USE_116_API_DEFAULT], [1],
              [Define using v1.16 public API symbols by default])
else
    AC_MSG_ERROR([invalid version of public symbols given])
fi

## It's an error to try to disable deprecated public API symbols while
## choosing an older version of the public API as the default. However,
## if the user insists on doing this via the --enable-unsupported configure
## flag, we'll let them.
if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
  if test "X${DEFAULT_API_VERSION}" != "Xv116" -a "X${DEPRECATED_SYMBOLS}" = "Xno" ; then
    AC_MSG_ERROR([Removing old public API symbols not allowed when using them as default public API symbols. Use --enable-unsupported to override this error.])
  fi
fi

## ----------------------------------------------------------------------
## Enable strict file format checks
##
AC_SUBST([STRICT_FORMAT_CHECKS])
AC_MSG_CHECKING([whether to perform strict file format checks]);
AC_ARG_ENABLE([strict-format-checks],
              [AS_HELP_STRING([--enable-strict-format-checks],
                     [Enable strict file format checks.
                      [default=yes if debug build, otherwise no]
                     ])],
             [STRICT_FORMAT_CHECKS=$enableval])

## Set the default level. This depends on the compiler mode.
if test "X-$STRICT_FORMAT_CHECKS" = X- ; then
  if test "X-$BUILD_MODE" = "X-debug" ; then
    STRICT_FORMAT_CHECKS=yes
  else
    STRICT_FORMAT_CHECKS=no
  fi
fi

case "X-$STRICT_FORMAT_CHECKS" in
  X-yes)
    AC_MSG_RESULT([yes])
    AC_DEFINE([STRICT_FORMAT_CHECKS], [1],
              [Define if strict file format checks are enabled])
    ;;
  X-no)
    AC_MSG_RESULT([no])
    ;;
  *)
    AC_MSG_ERROR([Unrecognized value: $STRICT_FORMAT_CHECKS])
    ;;
esac


## ----------------------------------------------------------------------
## Enable use of pread/pwrite instead of read/write in certain VFDs.
##
AC_SUBST([PREADWRITE])

## Check these first to avoid interspersed output in the AC_ARG_ENABLE line
## below. (Probably overkill to check for both, but we'll be extra careful)
PREADWRITE_HAVE_BOTH=yes
AC_CHECK_FUNC([pread], [], [PREADWRITE_HAVE_BOTH=no])
AC_CHECK_FUNC([pwrite], [], [PREADWRITE_HAVE_BOTH=no])

AC_MSG_CHECKING([whether to use pread/pwrite instead of read/write in certain VFDs])
AC_ARG_ENABLE([preadwrite],
              [AS_HELP_STRING([--enable-preadwrite],
                              [Enable using pread/pwrite instead of read/write in sec2/log/core VFDs.
                              [default=yes if pread/pwrite are present]])],
              [PREADWRITE=$enableval])

## Set the default level.
if test "X-$PREADWRITE" = X- ; then
  PREADWRITE=yes
fi

case "X-$PREADWRITE" in
  X-yes)
      if test "X-$PREADWRITE_HAVE_BOTH" = "X-yes"; then
        AC_DEFINE([HAVE_PREADWRITE], [1], [Define if both pread and pwrite exist.])
        AC_MSG_RESULT([yes])
      else
        AC_MSG_RESULT([no])
      fi
    ;;
  X-no)
      AC_MSG_RESULT([no])
    ;;
  *)
      AC_MSG_ERROR([Unrecognized value: $PREADWRITE])
    ;;
esac


## ----------------------------------------------------------------------
## Enable embedded library information
##
AC_MSG_CHECKING([whether to have library information embedded in the executables])
AC_ARG_ENABLE([embedded-libinfo],
    [AS_HELP_STRING([--enable-embedded-libinfo],
    [Enable embedded library information [default=yes]])],
    [enable_embedded_libinfo=$enableval],
    [enable_embedded_libinfo=yes])

   if test "${enable_embedded_libinfo}" = "yes"; then
      AC_MSG_RESULT([yes])
      BUILD_SETTINGS_FILE="src/H5build_settings.autotools.c.in"
      AC_DEFINE([HAVE_EMBEDDED_LIBINFO], [1],
                [Define if library information should be embedded in the executables])
   else
      BUILD_SETTINGS_FILE="src/H5build_settings.off.c.in"
      AC_MSG_RESULT([no])
    fi


## ----------------------------------------------------------------------
## Restore user's CFLAGS.
CFLAGS="$saved_user_CFLAGS"
FCFLAGS="$saved_user_FCFLAGS"
CXXFLAGS="$saved_user_CXXFLAGS"
CPPFLAGS="$saved_user_CPPFLAGS"
JAVACFLAGS="$saved_user_JAVACFLAGS"
JAVAFLAGS="$saved_user_JAVAFLAGS"
LDFLAGS="$saved_user_LDFLAGS"


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

AM_CONDITIONAL([BUILD_CXX_CONDITIONAL], [test "X$HDF_CXX" = "Xyes"])
AM_CONDITIONAL([BUILD_PARALLEL_CONDITIONAL], [test "X$PARALLEL" = "Xyes"])
AM_CONDITIONAL([BUILD_FORTRAN_CONDITIONAL], [test "X$HDF_FORTRAN" = "Xyes"])
AM_CONDITIONAL([BUILD_JAVA_CONDITIONAL], [test "X$HDF_JAVA" = "Xyes"])
AM_CONDITIONAL([BUILD_HDF5_HL_CONDITIONAL], [test "X$HDF5_HL" = "Xyes"])
AM_CONDITIONAL([BUILD_TESTS_CONDITIONAL], [test "X$HDF5_TESTS" = "Xyes"])
AM_CONDITIONAL([BUILD_TESTS_PARALLEL_CONDITIONAL], [test -n "$TESTPARALLEL"])
AM_CONDITIONAL([BUILD_TOOLS_CONDITIONAL], [test "X$HDF5_TOOLS" = "Xyes"])
AM_CONDITIONAL([BUILD_TOOLS_HL_GIF_CONDITIONAL], [test "X$HDF5_HL_GIF_TOOLS" = "Xyes"])
AM_CONDITIONAL([BUILD_DOXYGEN_CONDITIONAL], [test "X$HDF5_DOXYGEN" = "Xyes"])

## ----------------------------------------------------------------------
## Build the Makefiles.
##

## The directory search list
AC_SUBST([SEARCH]) SEARCH='$(srcdir) $(top_builddir)/src $(top_srcdir)/src'
export SEARCH

## Some cleanup stuff
rm -f conftest conftest.o conftest.c dummy.o *.mod

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

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

## Are we compiling static libraries, shared libraries, or both?  This
## is only used for the libhdf5.settings file. We can't just look at
## $enable_static and $enable_shared because if they're yes the ltconfig
## might have decided that one or the other is simply not possible.
## Therefore we have to ask the generated `libtool' shell script
## which 'features' it has enabled.
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

## Expose things for *.in markup
AC_SUBST([STATIC_SHARED])
AC_SUBST([enable_shared])
AC_SUBST([enable_static])

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

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

  ### libtool does not pass the correct argument linking (-Wl,-Wl,,) for the NAG Fortran compiler
  ### on Linux (other OSs have not been tested).
  ### Therefore, detect if we are using the NAG Fortran compiler, and replace the wl="-Wl," for Fortran to
  ### wl="-Wl,-Wl,," in the libtool file. (HDFFV-10037)
  case "`uname`" in
    Linux*)

    fortran_linux_linker_option="-Wl,"
    if test "X$FC_BASENAME" = "Xnagfor"; then
       fortran_linux_linker_option="-Wl,-Wl,,"
    fi

    ## Set the correct linker option for use in h5fc.in markup
    AC_SUBST([fortran_linux_linker_option])
    ;;
  esac

fi

## ----------------------------------------------------------------------
## Set a macro if shared library is enabled.
##
AM_CONDITIONAL([HAVE_SHARED_CONDITIONAL], [test "X$enable_shared" = "Xyes"])

AC_CONFIG_FILES([Makefile
                 doxygen/Doxyfile
                 src/Makefile
                 src/libhdf5.settings
                 src/H5build_settings.c:${BUILD_SETTINGS_FILE}
                 test/Makefile
                 test/H5srcdir_str.h
                 test/test_abort_fail.sh
                 test/test_check_version.sh
                 test/test_error.sh
                 test/test_external_env.sh
                 test/test_flush_refresh.sh
                 test/test_libinfo.sh
                 test/test_links_env.sh
                 test/test_mirror.sh
                 test/test_plugin.sh
                 test/test_swmr.sh
                 test/test_use_cases.sh
                 test/test_vds_env.sh
                 test/test_vds_swmr.sh
                 testpar/Makefile
                 testpar/testpflush.sh
                 utils/Makefile
                 utils/mirror_vfd/Makefile
                 utils/test/Makefile
                 utils/tools/Makefile
                 utils/tools/h5dwalk/Makefile
                 utils/tools/test/Makefile
                 utils/tools/test/h5dwalk/Makefile
                 utils/tools/test/h5dwalk/copy_demo_files.sh
                 utils/tools/test/h5dwalk/testh5dwalk.sh
                 tools/Makefile
                 tools/lib/Makefile
                 tools/libtest/Makefile
                 tools/src/Makefile
                 tools/src/h5dump/Makefile
                 tools/src/h5import/Makefile
                 tools/src/h5diff/Makefile
                 tools/src/h5jam/Makefile
                 tools/src/h5repack/Makefile
                 tools/src/h5ls/Makefile
                 tools/src/h5copy/Makefile
                 tools/src/misc/Makefile
                 tools/src/h5stat/Makefile
                 tools/test/Makefile
                 tools/test/h5dump/Makefile
                 tools/test/h5dump/h5dump_plugin.sh
                 tools/test/h5dump/testh5dump.sh
                 tools/test/h5dump/testh5dumppbits.sh
                 tools/test/h5dump/testh5dumpvds.sh
                 tools/test/h5dump/testh5dumpxml.sh
                 tools/test/h5ls/Makefile
                 tools/test/h5ls/h5ls_plugin.sh
                 tools/test/h5ls/testh5ls.sh
                 tools/test/h5ls/testh5lsvds.sh
                 tools/test/h5import/Makefile
                 tools/test/h5import/h5importtestutil.sh
                 tools/test/h5diff/Makefile
                 tools/test/h5diff/h5diff_plugin.sh
                 tools/test/h5diff/testh5diff.sh
                 tools/test/h5diff/testph5diff.sh
                 tools/src/h5format_convert/Makefile
                 tools/test/h5format_convert/Makefile
                 tools/test/h5format_convert/testh5fc.sh
                 tools/test/h5jam/Makefile
                 tools/test/h5jam/testh5jam.sh
                 tools/test/h5repack/Makefile
                 tools/test/h5repack/h5repack.sh
                 tools/test/h5repack/h5repack_plugin.sh
                 tools/test/h5copy/Makefile
                 tools/test/h5copy/testh5copy.sh
                 tools/test/misc/Makefile
                 tools/test/misc/testh5clear.sh
                 tools/test/misc/testh5mkgrp.sh
                 tools/test/misc/testh5repart.sh
                 tools/test/misc/vds/Makefile
                 tools/test/h5stat/Makefile
                 tools/test/h5stat/testh5stat.sh
                 tools/src/h5perf/Makefile
                 tools/test/perform/Makefile
                 examples/Makefile
                 examples/run-c-ex.sh
                 examples/testh5cc.sh
                 bin/h5cc
                 bin/Makefile
                 c++/Makefile
                 c++/src/Makefile
                 c++/src/h5c++
                 c++/test/Makefile
                 c++/test/H5srcdir_str.h
                 c++/examples/Makefile
                 c++/examples/run-c++-ex.sh
                 c++/examples/testh5c++.sh
                 fortran/Makefile
                 fortran/src/h5fc
                 fortran/src/Makefile
                 fortran/src/H5fort_type_defines.h
                 fortran/test/Makefile
                 fortran/testpar/Makefile
                 fortran/examples/Makefile
                 fortran/examples/run-fortran-ex.sh
                 fortran/examples/testh5fc.sh
                 java/Makefile
                 java/src/Makefile
                 java/src/jni/Makefile
                 java/test/Makefile
                 java/test/junit.sh
                 hl/Makefile
                 hl/src/Makefile
                 hl/test/Makefile
                 hl/test/H5srcdir_str.h
                 hl/tools/Makefile
                 hl/tools/gif2h5/Makefile
                 hl/tools/gif2h5/h52giftest.sh
                 hl/tools/h5watch/Makefile
                 hl/tools/h5watch/testh5watch.sh
                 hl/examples/Makefile
                 hl/examples/run-hlc-ex.sh
                 hl/c++/Makefile
                 hl/c++/src/Makefile
                 hl/c++/test/Makefile
                 hl/c++/examples/Makefile
                 hl/c++/examples/run-hlc++-ex.sh
                 hl/fortran/Makefile
                 hl/fortran/src/Makefile
                 hl/fortran/test/Makefile
                 hl/fortran/examples/Makefile
                 hl/fortran/examples/run-hlfortran-ex.sh])

AC_CONFIG_FILES([utils/subfiling_vfd/h5fuse], [chmod +x utils/subfiling_vfd/h5fuse])
if test -n "$TESTPARALLEL"; then
  if test "X$SUBFILING_VFD" = "Xyes"; then
    AC_CONFIG_LINKS([testpar/h5fuse:utils/subfiling_vfd/h5fuse])
  fi
fi

AC_OUTPUT

chmod 755 bin/h5cc
if test "X$HDF_CXX" = "Xyes"; then
  chmod 755 c++/src/h5c++
fi


if test "X$HDF_FORTRAN" = "Xyes"; then
  chmod 755 fortran/src/h5fc
  ## libtool does not pass the correct argument linker (wl=) for the Intel Fortran compiler
  ## on OS X, which is needed when building shared libraries on OS X.  This script
  ## replaces the 3rd occurrence, which is for Fortran, of wl="" with wl="-Wl," (HDFFV-2772)
  case "`uname`" in
    Darwin*)
      cat libtool | awk '/wl=\"/{c++;if(c==3){sub("wl=\"\"","wl=\"-Wl,\"");c=0}}1' > libtool.tmp && mv -f libtool.tmp libtool && chmod 755 libtool
      ;;
  esac

  ### libtool does not pass the correct linker options for some Fortran compilers
  ### on Linux (other OSs have not been tested).
  case "`uname`" in
    Linux*)
      ### NAG Fortran needs to replace "-Wl," with "-Wl,-Wl,," (HDFFV-10037)
      if test "X$FC_BASENAME" = "Xnagfor"; then
         cat libtool | awk '/BEGIN LIBTOOL TAG CONFIG: FC/{flag=1}flag&&/wl=/{$NF="wl=\"-Wl,-Wl,,\"";flag=0}1' > libtool.tmp && mv -f libtool.tmp libtool && chmod 755 libtool
      fi
      ### Flang needs to replace "", with "-Wl," (avoids unknown option: -soname issues)
      if test "X$FC_BASENAME" = "Xflang"; then
         cat libtool | awk '/BEGIN LIBTOOL TAG CONFIG: FC/{flag=1}flag&&/wl=/{$NF="wl=\"-Wl,\"";flag=0}1' > libtool.tmp && mv -f libtool.tmp libtool && chmod 755 libtool
      fi
      ;;
  esac
fi

## show the configure settings
cat src/libhdf5.settings