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dnl Fix Autoconf-2.59 bugs: by overriding broken internal

dnl Autoconf macros with backports of the 2.60+ fix.

dnl - AC_CONFIG_SUBDIRS whitespace mangling,

dnl - more lenient precious variable checks

dnl

dnl This file should be a no-op for Autoconf versions != 2.59.

dnl It can be removed once the complete tree has moved to a

dnl newer Autoconf version.

dnl m4_PACKAGE_VERSION is an undocumented Autoconf macro.

dnl We use it because this fix is intended for 2.59 only.

dnl A feature test for the broken AC_CONFIG_SUBDIRS instead

dnl would be better but is tricky.

dnl

dnl Use ifdef/ifelse over m4_ifdef/m4_ifelse to be clean for 2.13.

dnl Redefine AC_CONFIG_SUBDIRS so aclocal pulls in this file

dnl when needed.

ifdef([m4_PACKAGE_VERSION],

[dnl AC_DEFUN a commonly used macro so this file is picked up.

m4_copy([AC_PREREQ], [_AC_PREREQ])

AC_DEFUN([AC_PREREQ], [frob])

m4_copy([_AC_PREREQ], [AC_PREREQ])

ifelse(m4_PACKAGE_VERSION, [2.59], [

# _AC_OUTPUT_SUBDIRS

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

# This is a subroutine of AC_OUTPUT, but it does not go into

# config.status, rather, it is called after running config.status.

m4_define([_AC_OUTPUT_SUBDIRS],

[

#

# CONFIG_SUBDIRS section, as fixed in confsubdir.m4.

#

if test "$no_recursion" != yes; then

  # Remove --cache-file and --srcdir arguments so they do not pile up.

  ac_sub_configure_args=

  ac_prev=

  eval "set x $ac_configure_args"

  shift

  for ac_arg

  do

    if test -n "$ac_prev"; then

      ac_prev=

      continue

    fi

    case $ac_arg in

    -cache-file | --cache-file | --cache-fil | --cache-fi \

    | --cache-f | --cache- | --cache | --cach | --cac | --ca | --c)

      ac_prev=cache_file ;;

    -cache-file=* | --cache-file=* | --cache-fil=* | --cache-fi=* \

    | --cache-f=* | --cache-=* | --cache=* | --cach=* | --cac=* | --ca=* \

    | --c=*)

      ;;

    --config-cache | -C)

      ;;

    -srcdir | --srcdir | --srcdi | --srcd | --src | --sr)

      ac_prev=srcdir ;;

    -srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)

      ;;

    -prefix | --prefix | --prefi | --pref | --pre | --pr | --p)

      ac_prev=prefix ;;

    -prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)

      ;;

    *)

      case $ac_arg in

      *\'*) ac_arg=`echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;

      esac

      ac_sub_configure_args="$ac_sub_configure_args '$ac_arg'" ;;

    esac

  done

  # Always prepend --prefix to ensure using the same prefix

  # in subdir configurations.

  ac_arg="--prefix=$prefix"

  case $ac_arg in

  *\'*) ac_arg=`echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;

  esac

  ac_sub_configure_args="$ac_arg $ac_sub_configure_args"

  ac_popdir=`pwd`

  for ac_dir in : $subdirs; do test "x$ac_dir" = x: && continue

    # Do not complain, so a configure script can configure whichever

    # parts of a large source tree are present.

    test -d "$srcdir/$ac_dir" || continue

    AC_MSG_NOTICE([configuring in $ac_dir])

    AS_MKDIR_P(["$ac_dir"])

    _AC_SRCPATHS(["$ac_dir"])

    cd "$ac_dir"

    # Check for guested configure; otherwise get Cygnus style configure.

    if test -f "$ac_srcdir/configure.gnu"; then

      ac_sub_configure=$ac_srcdir/configure.gnu

    elif test -f "$ac_srcdir/configure"; then

      ac_sub_configure=$ac_srcdir/configure

    elif test -f "$ac_srcdir/configure.in"; then

      # This should be Cygnus configure.

      ac_sub_configure=$ac_aux_dir/configure

    else

      AC_MSG_WARN([no configuration information is in $ac_dir])

      ac_sub_configure=

    fi

    # The recursion is here.

    if test -n "$ac_sub_configure"; then

      # Make the cache file name correct relative to the subdirectory.

      case $cache_file in

      [[\\/]]* | ?:[[\\/]]* ) ac_sub_cache_file=$cache_file ;;

      *) # Relative path.

        ac_sub_cache_file=$ac_top_builddir$cache_file ;;

      esac

      AC_MSG_NOTICE([running $SHELL $ac_sub_configure $ac_sub_configure_args --cache-file=$ac_sub_cache_file --srcdir=$ac_srcdir])

      # The eval makes quoting arguments work.

      eval "\$SHELL \"\$ac_sub_configure\" $ac_sub_configure_args \

           --cache-file=\"\$ac_sub_cache_file\" --srcdir=\"\$ac_srcdir\"" ||

        AC_MSG_ERROR([$ac_sub_configure failed for $ac_dir])

    fi

    cd "$ac_popdir"

  done

fi

])# _AC_OUTPUT_SUBDIRS

])

ifelse(m4_PACKAGE_VERSION, [2.62],, [

# _AC_ARG_VAR_VALIDATE

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

# The code is the same as autoconf 2.59, but with a more lenient check

# on precious variables that has been added in autoconf 2.62.

m4_define([_AC_ARG_VAR_VALIDATE],

[# Check that the precious variables saved in the cache have kept the same

# value.

ac_cache_corrupted=false

for ac_var in `(set) 2>&1 |

               sed -n 's/^ac_env_\([[a-zA-Z_0-9]]*\)_set=.*/\1/p'`; do

  eval ac_old_set=\$ac_cv_env_${ac_var}_set

  eval ac_new_set=\$ac_env_${ac_var}_set

  eval ac_old_val="\$ac_cv_env_${ac_var}_value"

  eval ac_new_val="\$ac_env_${ac_var}_value"

  case $ac_old_set,$ac_new_set in

    set,)

      AS_MESSAGE([error: `$ac_var' was set to `$ac_old_val' in the previous run], 2)

      ac_cache_corrupted=: ;;

    ,set)

      AS_MESSAGE([error: `$ac_var' was not set in the previous run], 2)

      ac_cache_corrupted=: ;;

    ,);;

    *)

      if test "x$ac_old_val" != "x$ac_new_val"; then

        # differences in whitespace do not lead to failure.

        ac_old_val_w=`echo x $ac_old_val`

        ac_new_val_w=`echo x $ac_new_val`

        if test "$ac_old_val_w" != "$ac_new_val_w"; then

          AS_MESSAGE([error: `$ac_var' has changed since the previous run:], 2)

          ac_cache_corrupted=:

        else

          AS_MESSAGE([warning: ignoring whitespace changes in `$ac_var' since the previous run:], 2)

          eval $ac_var=\$ac_old_val

        fi

        AS_MESSAGE([  former value:  `$ac_old_val'], 2)

        AS_MESSAGE([  current value: `$ac_new_val'], 2)

      fi;;

  esac

  # Pass precious variables to config.status.

  if test "$ac_new_set" = set; then

    case $ac_new_val in

dnl If you change this globbing pattern, test it on an old shell --

dnl it's sensitive.  Putting any kind of quote in it causes syntax errors.

[    *" "*|*"   "*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?\"\']*)]

      ac_arg=$ac_var=`echo "$ac_new_val" | sed "s/'/'\\\\\\\\''/g"` ;;

    *) ac_arg=$ac_var=$ac_new_val ;;

    esac

    case " $ac_configure_args " in

      *" '$ac_arg' "*) ;; # Avoid dups.  Use of quotes ensures accuracy.

      *) ac_configure_args="$ac_configure_args '$ac_arg'" ;;

    esac

  fi

done

if $ac_cache_corrupted; then

  AS_MESSAGE([error: changes in the environment can compromise the build], 2)

  AS_ERROR([run `make distclean' and/or `rm $cache_file' and start over])

fi

])# _AC_ARG_VAR_VALIDATE

])])