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dnl  Autoconf script for GNU Emacs
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dnl To rebuild the 'configure' script from this, execute the command
dnl	autoconf
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dnl in the directory containing this script.
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dnl If you changed any AC_DEFINES, also run autoheader.
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dnl
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dnl Copyright (C) 1994-1996, 1999-2019 Free Software Foundation, Inc.
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dnl
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dnl  This file is part of GNU Emacs.
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dnl
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dnl  GNU Emacs is free software: you can redistribute it and/or modify
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dnl  it under the terms of the GNU General Public License as published by
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dnl  the Free Software Foundation, either version 3 of the License, or
dnl  (at your option) any later version.
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dnl
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dnl  GNU Emacs is distributed in the hope that it will be useful,
dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl  GNU General Public License for more details.
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dnl
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dnl  You should have received a copy of the GNU General Public License
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dnl  along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
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AC_PREREQ(2.65)
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dnl Note this is parsed by (at least) make-dist and lisp/cedet/ede/emacs.el.
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AC_INIT(GNU Emacs, 27.0.50, bug-gnu-emacs@gnu.org, , https://www.gnu.org/software/emacs/)
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dnl Set emacs_config_options to the options of 'configure', quoted for the shell,
dnl and then quoted again for a C string.  Separate options with spaces.
dnl Add some environment variables, if they were passed via the environment
dnl rather than on the command-line.
emacs_config_options=
optsep=
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dnl This is the documented way to record the args passed to configure,
dnl rather than $ac_configure_args.
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for opt in "$@" CFLAGS CPPFLAGS LDFLAGS; do
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  case $opt in
    -n | --no-create | --no-recursion)
      continue ;;
    CFLAGS | CPPFLAGS | LDFLAGS)
      eval 'test "${'$opt'+set}" = set' || continue
      case " $*" in
	*" $opt="*) continue ;;
      esac
      eval opt=$opt=\$$opt ;;
  esac

  emacs_shell_specials=$IFS\''"#$&()*;<>?@<:@\\`{|~'
  case $opt in
    *[["$emacs_shell_specials"]]*)
      case $opt in
	*\'*)
	  emacs_quote_apostrophes="s/'/'\\\\''/g"
	  opt=`AS_ECHO(["$opt"]) | sed "$emacs_quote_apostrophes"` ;;
      esac
      opt="'$opt'"
      case $opt in
	*[['"\\']]*)
	  emacs_quote_for_c='s/[["\\]]/\\&/g; $!s/$/\\n\\/'
	  opt=`AS_ECHO(["$opt"]) | sed "$emacs_quote_for_c"` ;;
      esac ;;
  esac
  AS_VAR_APPEND([emacs_config_options], ["$optsep$opt"])
  optsep=' '
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done

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AC_CONFIG_HEADERS(src/config.h:src/config.in)
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AC_CONFIG_SRCDIR(src/lisp.h)
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AC_CONFIG_AUX_DIR(build-aux)
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AC_CONFIG_MACRO_DIR(m4)
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xcsdkdir=
AC_CHECK_PROGS(XCRUN, [xcrun])
if test -n "$XCRUN"; then
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  if test -z "$MAKE"; then
    dnl Call the variable MAKE_PROG, not MAKE, to avoid confusion with
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    dnl the usual MAKE variable that 'make' itself uses.
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    AC_CHECK_PROG([MAKE_PROG], [make], [yes])
    if test -z "$MAKE_PROG"; then
      MAKE="$XCRUN MAKE"
      export MAKE
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      xcsdkdir=`$XCRUN --show-sdk-path 2>/dev/null`
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    fi
  fi
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fi

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dnl Check for GNU Make and possibly set MAKE.
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[emacs_check_gnu_make ()
{
  emacs_makeout=`($1 --version) 2>/dev/null` &&
  case $emacs_makeout in
    'GNU Make '3.8[1-9]* | 'GNU Make '3.9[0-9]* | \
    'GNU Make '3.[1-9][0-9][0-9]* | 'GNU Make '[4-9]* | 'GNU Make '[1-9][0-9]* )
       ac_path_MAKE_found=:;;
  esac
}]
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AC_CACHE_CHECK([for GNU Make], [ac_cv_path_MAKE],
  [ac_path_MAKE_found=false
   if test -n "$MAKE"; then
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     emacs_check_gnu_make "$MAKE"
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     ac_cv_path_MAKE=$MAKE
   else
     emacs_tried_make=false
     emacs_tried_gmake=false
     emacs_tried_gnumake=false
     AC_PATH_PROGS_FEATURE_CHECK([MAKE], [make gmake gnumake],
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       [[emacs_check_gnu_make "$ac_path_MAKE"
	 if $ac_path_MAKE_found; then
	   # Use the fully-qualified program name only if the basename
	   # would not resolve to it.
	   if eval \$emacs_tried_$ac_prog; then
	     ac_cv_path_MAKE=$ac_path_MAKE
	   else
	     ac_cv_path_MAKE=$ac_prog
	   fi
	 fi
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	 eval emacs_tried_$ac_prog=:]])
   fi])
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$ac_path_MAKE_found || {
AC_MSG_ERROR([[Building Emacs requires GNU Make, at least version 3.81.
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If you have it installed under another name, configure with 'MAKE=...'.
For example, run '$0 MAKE=gnu-make'.]])
}
MAKE=$ac_cv_path_MAKE
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export MAKE
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dnl Canonicalize the configuration name.
AC_CANONICAL_HOST

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case $host in
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 *-mingw*)

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  if test -z "$host_alias"; then

      # No --host argument was given to 'configure'; therefore $host
      # was set to a default value based on the build platform.  But
      # this default value may be wrong if we are building from a
      # 64-bit MSYS[2] pre-configured to build 32-bit MinGW programs.
      # Therefore, we'll try to get the right host platform from the
      # compiler's target.

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      AC_MSG_CHECKING([the compiler's target])
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      if test -z "$CC"; then
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	  cc=gcc
      else
	  cc=$CC
      fi
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      cc_target=`$cc -v 2>&1 | sed -n 's/Target: //p'`
      case "$cc_target" in
          *-*) host=$cc_target
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	      ;;
          "") AC_MSG_ERROR([Impossible to obtain $cc compiler target.
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Please explicitly provide --host.])
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              ;;
	  *) AC_MSG_WARN([Compiler reported non-standard target.
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Defaulting to $host.])
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              ;;
      esac
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      AC_MSG_RESULT([$host])
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  fi

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  . $srcdir/nt/mingw-cfg.site

  case $srcdir in
    /* | ?:*)
      # srcdir is an absolute path.  In this case, force the format
      # "/c/foo/bar", to simplify later conversions to native Windows
      # format ("c:/foo/bar").
      srcdir=`cd "${srcdir}" && pwd -W`
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      # 'eval' pacifies strict POSIX non-MinGW shells (Bug#18612).
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      # We downcase the drive letter to avoid warnings when
      # generating autoloads.
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      eval 'srcdir=/`echo ${srcdir:0:1} | sed "y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/"`"${srcdir:2}"'
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      ;;
  esac;;
esac

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canonical=$host
configuration=${host_alias-${build_alias-$host}}
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emacs_uname_r=`uname -r`
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dnl Support for --program-prefix, --program-suffix and
dnl --program-transform-name options
AC_ARG_PROGRAM

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dnl It is important that variables on the RHS not be expanded here,
dnl hence the single quotes.  This is per the GNU coding standards, see
dnl (autoconf) Installation Directory Variables
dnl See also epaths.h below.
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lispdir='${datadir}/emacs/${version}/lisp'
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standardlisppath='${lispdir}'
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locallisppath='${datadir}/emacs/${version}/site-lisp:'\
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'${datadir}/emacs/site-lisp'
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lisppath='${locallisppath}:${standardlisppath}'
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etcdir='${datadir}/emacs/${version}/etc'
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archlibdir='${libexecdir}/emacs/${version}/${configuration}'
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etcdocdir='${datadir}/emacs/${version}/etc'
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gamedir='${localstatedir}/games/emacs'
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dnl Special option to disable the most of other options.
AC_ARG_WITH(all,
[AS_HELP_STRING([--without-all],
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		[omit almost all features and build
		small executable with minimal dependencies])],
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  [with_features=$withval],
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  [with_features=yes])
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dnl OPTION_DEFAULT_OFF(NAME, HELP-STRING)
dnl Create a new --with option that defaults to being disabled.
dnl NAME is the base name of the option.  The shell variable with_NAME
dnl   will be set to either the user's value (if the option is
dnl   specified; 'yes' for a plain --with-NAME) or to 'no' (if the
dnl   option is not specified).  Note that the shell variable name is
dnl   constructed as autoconf does, by replacing non-alphanumeric
dnl   characters with "_".
dnl HELP-STRING is the help text for the option.
AC_DEFUN([OPTION_DEFAULT_OFF], [dnl
  AC_ARG_WITH([$1],[AS_HELP_STRING([--with-$1],[$2])],[],[dnl
    m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=no])dnl
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])dnl
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dnl OPTION_DEFAULT_ON(NAME, HELP-STRING)
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dnl Create a new --with option that defaults to $with_features.
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dnl NAME is the base name of the option.  The shell variable with_NAME
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dnl   will be set either to 'no' (for a plain --without-NAME) or to
dnl   'yes' (if the option is not specified).  Note that the shell
dnl   variable name is constructed as autoconf does, by replacing
dnl   non-alphanumeric characters with "_".
dnl HELP-STRING is the help text for the option.
AC_DEFUN([OPTION_DEFAULT_ON], [dnl
  AC_ARG_WITH([$1],[AS_HELP_STRING([--without-$1],[$2])],[],[dnl
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   m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=$with_features])dnl
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])dnl

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# For retrieving mail, unencrypted network connections are the default
# only on native MS-Windows platforms.  (FIXME: These platforms should
# also be secure by default.)
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AC_ARG_WITH([mailutils],
  [AS_HELP_STRING([--with-mailutils],
     [rely on GNU Mailutils, so that the --without-pop through --with-mailhost
      options are irrelevant; this is the default if GNU Mailutils is
      installed])],
  [],
  [with_mailutils=$with_features
   if test "$with_mailutils" = yes; then
     (movemail --version) >/dev/null 2>&1 || with_mailutils=no
   fi])
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if test "$with_mailutils" = no; then
  with_mailutils=
fi
AC_SUBST([with_mailutils])

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AC_ARG_WITH([pop],
  [AS_HELP_STRING([--with-pop],
     [Support POP mail retrieval if Emacs movemail is used (not recommended,
      as Emacs movemail POP is insecure).  This is the default only on
      native MS-Windows.])],
  [],
  [case $host in
     *-mingw*) with_pop=yes;;
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     *) with_pop=no-by-default;;
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   esac])
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if test "$with_pop" = yes; then
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   AC_DEFINE(MAIL_USE_POP)
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fi
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AH_TEMPLATE(MAIL_USE_POP, [Define to support POP mail retrieval.])dnl
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OPTION_DEFAULT_OFF([kerberos],[support Kerberos-authenticated POP])
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if test "$with_kerberos" != no; then
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   AC_DEFINE(KERBEROS)
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fi
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AH_TEMPLATE(KERBEROS,
	    [Define to support Kerberos-authenticated POP mail retrieval.])dnl
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OPTION_DEFAULT_OFF([kerberos5],[support Kerberos version 5 authenticated POP])
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if test "${with_kerberos5}" != no; then
  if test "${with_kerberos}" = no; then
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    with_kerberos=yes
    AC_DEFINE(KERBEROS)
  fi
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  AC_DEFINE(KERBEROS5, 1, [Define to use Kerberos 5 instead of Kerberos 4.])
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fi
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OPTION_DEFAULT_OFF([hesiod],[support Hesiod to get the POP server host])
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dnl FIXME hesiod support may not be present, so it seems like an error
dnl to define, or at least use, this unconditionally.
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if test "$with_hesiod" != no; then
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  AC_DEFINE(HESIOD, 1, [Define to support using a Hesiod database to find the POP server.])
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fi
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OPTION_DEFAULT_OFF([mail-unlink],[unlink, rather than empty, mail spool after reading])
if test "$with_mail_unlink" != no; then
   AC_DEFINE(MAIL_UNLINK_SPOOL, 1, [Define to unlink, rather than empty, mail spool after reading.])
fi

AC_ARG_WITH([mailhost],[AS_HELP_STRING([--with-mailhost=HOSTNAME],
    [string giving default POP mail host])],
    AC_DEFINE_UNQUOTED(MAILHOST, ["$withval"], [String giving fallback POP mail host.]))

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AC_ARG_WITH([sound],[AS_HELP_STRING([--with-sound=VALUE],
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  [compile with sound support (VALUE one of: yes, alsa, oss, bsd-ossaudio, no;
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default yes).  Only for GNU/Linux, FreeBSD, NetBSD, MinGW, Cygwin.])],
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  [ case "${withval}" in
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      yes|no|alsa|oss|bsd-ossaudio) val=$withval ;;
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      *) AC_MSG_ERROR(['--with-sound=$withval' is invalid;
this option's value should be 'yes', 'no', 'alsa', 'oss', or 'bsd-ossaudio'.])
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      ;;
    esac
    with_sound=$val
  ],
  [with_sound=$with_features])
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AC_ARG_WITH([pdumper],
  AS_HELP_STRING(
    [--with-pdumper=VALUE],
    [enable pdumper support unconditionally
      ('yes', 'no', or 'auto': default 'auto')]),
    [ case "${withval}" in
        yes|no|auto) val=$withval ;;
        *) AC_MSG_ERROR(
           ['--with-pdumper=$withval' is invalid;
this option's value should be 'yes' or 'no'.]) ;;
      esac
      with_pdumper=$val
    ],
    [with_pdumper=auto])

AC_ARG_WITH([unexec],
  AS_HELP_STRING(
    [--with-unexec=VALUE],
    [enable unexec support unconditionally
      ('yes', 'no', or 'auto': default 'auto')]),
    [ case "${withval}" in
        yes|no|auto) val=$withval ;;
        *) AC_MSG_ERROR(
           ['--with-unexec=$withval' is invalid;
this option's value should be 'yes' or 'no'.]) ;;
      esac
      with_unexec=$val
    ],
    [with_unexec=auto])

AC_ARG_WITH([dumping],[AS_HELP_STRING([--with-dumping=VALUE],
    [kind of dumping to use for initial Emacs build
(VALUE one of: pdumper, unexec, none; default pdumper)])],
    [ case "${withval}" in
        pdumper|unexec|none) val=$withval ;;
        *) AC_MSG_ERROR(['--with-dumping=$withval is invalid;
this option's value should be 'pdumper', 'unexec', or 'none'.])
        ;;
      esac
      with_dumping=$val
    ],
    [with_dumping=pdumper])

if test "$with_pdumper" = "auto"; then
  if test "$with_dumping" = "pdumper"; then
    with_pdumper=yes
  else
    with_pdumper=no
  fi
fi

if test "$with_unexec" = "auto"; then
  if test "$with_dumping" = "unexec"; then
    with_unexec=yes
  else
    with_unexec=no
  fi
fi

if test "$with_dumping" = "pdumper" && test "$with_pdumper" = "no"; then
  AC_MSG_ERROR(['--with-dumping=pdumper' requires pdumper support])
fi

if test "$with_dumping" = "unexec" && test "$with_unexec" = "no"; then
  AC_MSG_ERROR(['--with-dumping=unexec' requires unexec support])
fi

if test "$with_pdumper" = "yes"; then
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  AC_DEFINE([HAVE_PDUMPER], 1, [Define to build with portable dumper support])
  HAVE_PDUMPER=yes
else
  HAVE_PDUMPER=no
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fi
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AC_SUBST([HAVE_PDUMPER])
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DUMPING=$with_dumping
AC_SUBST(DUMPING)

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dnl FIXME currently it is not the last.
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dnl This should be the last --with option, because --with-x is
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dnl added later on when we find the file name of X, and it's best to
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dnl keep them together visually.
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AC_ARG_WITH([x-toolkit],[AS_HELP_STRING([--with-x-toolkit=KIT],
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 [use an X toolkit (KIT one of: yes or gtk, gtk2, gtk3, lucid or athena, motif, no)])],
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[	  case "${withval}" in
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	    y | ye | yes )	val=gtk ;;
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	    n | no )		val=no  ;;
	    l | lu | luc | luci | lucid )	val=lucid ;;
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	    a | at | ath | athe | athen | athena )	val=athena ;;
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	    m | mo | mot | moti | motif )	val=motif ;;
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	    g | gt | gtk  )	val=gtk ;;
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	    gtk2  )	val=gtk2 ;;
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	    gtk3  )	val=gtk3 ;;
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	    * )
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AC_MSG_ERROR(['--with-x-toolkit=$withval' is invalid;
this option's value should be 'yes', 'no', 'lucid', 'athena', 'motif', 'gtk',
'gtk2' or 'gtk3'.  'yes' and 'gtk' are synonyms.
'athena' and 'lucid' are synonyms.])
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	    ;;
	  esac
	  with_x_toolkit=$val
])
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OPTION_DEFAULT_OFF([wide-int], [prefer wide Emacs integers (typically 62-bit); allows buffer and string size up to 2GB on 32-bit hosts, at the cost of 10% to 30% slowdown of Lisp interpreter and larger memory footprint])
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if test "$with_wide_int" = yes; then
  AC_DEFINE([WIDE_EMACS_INT], 1, [Use long long for EMACS_INT if available.])
fi

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dnl _ON results in a '--without' option in the --help output, so
dnl the help text should refer to "don't compile", etc.
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with_xpm_set=${with_xpm+set}
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OPTION_DEFAULT_ON([xpm],[don't compile with XPM image support])
OPTION_DEFAULT_ON([jpeg],[don't compile with JPEG image support])
OPTION_DEFAULT_ON([tiff],[don't compile with TIFF image support])
OPTION_DEFAULT_ON([gif],[don't compile with GIF image support])
OPTION_DEFAULT_ON([png],[don't compile with PNG image support])
OPTION_DEFAULT_ON([rsvg],[don't compile with SVG image support])
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OPTION_DEFAULT_ON([lcms2],[don't compile with Little CMS support])
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OPTION_DEFAULT_ON([libsystemd],[don't compile with libsystemd support])
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OPTION_DEFAULT_OFF([cairo],[compile with Cairo drawing (experimental)])
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OPTION_DEFAULT_ON([xml2],[don't compile with XML parsing support])
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OPTION_DEFAULT_ON([imagemagick],[don't compile with ImageMagick image support])
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OPTION_DEFAULT_ON([json], [don't compile with native JSON support])
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OPTION_DEFAULT_ON([xft],[don't use XFT for anti aliased fonts])
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OPTION_DEFAULT_ON([libotf],[don't use libotf for OpenType font support])
OPTION_DEFAULT_ON([m17n-flt],[don't use m17n-flt for text shaping])

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OPTION_DEFAULT_ON([toolkit-scroll-bars],[don't use Motif/Xaw3d/GTK toolkit scroll bars])
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OPTION_DEFAULT_ON([xaw3d],[don't use Xaw3d])
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OPTION_DEFAULT_ON([xim],[at runtime, default X11 XIM to off])
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AC_ARG_WITH([ns],[AS_HELP_STRING([--with-ns],
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[use Nextstep (macOS Cocoa or GNUstep) windowing system.
On by default on macOS.])],[],[with_ns=maybe])
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OPTION_DEFAULT_OFF([w32], [use native MS Windows GUI in a Cygwin build])
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OPTION_DEFAULT_ON([gpm],[don't use -lgpm for mouse support on a GNU/Linux console])
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OPTION_DEFAULT_ON([dbus],[don't compile with D-Bus support])
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AC_ARG_WITH([gconf],[AS_HELP_STRING([--with-gconf],
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[compile with Gconf support (Gsettings replaces this)])],[],
[if test $with_features = yes; then
with_gconf=maybe
else
with_gconf=no
fi])
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OPTION_DEFAULT_ON([gsettings],[don't compile with GSettings support])
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OPTION_DEFAULT_ON([selinux],[don't compile with SELinux support])
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OPTION_DEFAULT_ON([gnutls],[don't use -lgnutls for SSL/TLS support])
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OPTION_DEFAULT_ON([zlib],[don't compile with zlib decompression support])
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OPTION_DEFAULT_OFF([modules],[compile with dynamic modules support])
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OPTION_DEFAULT_ON([threads],[don't compile with elisp threading support])
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AC_ARG_WITH([file-notification],[AS_HELP_STRING([--with-file-notification=LIB],
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 [use a file notification library (LIB one of: yes, inotify, kqueue, gfile, w32, no)])],
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 [ case "${withval}" in
    y | ye | yes )	val=yes ;;
    n | no )		val=no  ;;
    i | in | ino | inot | inoti | inotif | inotify )	val=inotify ;;
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    k | kq | kqu | kque | kqueu | kqueue )	val=kqueue ;;
    g | gf | gfi | gfil | gfile )	val=gfile ;;
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    w | w3 | w32 )	val=w32 ;;
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    * ) AC_MSG_ERROR(['--with-file-notification=$withval' is invalid;
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this option's value should be 'yes', 'no', 'inotify', 'kqueue', 'gfile' or 'w32'.
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'yes' is a synonym for 'w32' on MS-Windows, for 'no' on Nextstep,
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otherwise for the first of 'inotify', 'kqueue' or 'gfile' that is usable.])
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    ;;
   esac
   with_file_notification=$val
 ],
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 [with_file_notification=$with_features])
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OPTION_DEFAULT_OFF([xwidgets],
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  [enable use of some gtk widgets in Emacs buffers (requires gtk3)])
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## For the times when you want to build Emacs but don't have
## a suitable makeinfo, and can live without the manuals.
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dnl https://lists.gnu.org/r/emacs-devel/2008-04/msg01844.html
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OPTION_DEFAULT_ON([makeinfo],[don't require makeinfo for building manuals])

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## Makefile.in needs the cache file name.
AC_SUBST(cache_file)

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## This is an option because I do not know if all info/man support
## compressed files, nor how to test if they do so.
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OPTION_DEFAULT_ON([compress-install],
  [don't compress some files (.el, .info, etc.) when installing.  Equivalent to:
make GZIP_PROG= install])
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AC_ARG_WITH(gameuser,dnl
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[AS_HELP_STRING([--with-gameuser=USER_OR_GROUP],
		[user for shared game score files.
		An argument prefixed by ':' specifies a group instead.])])
gameuser=
gamegroup=
case ${with_gameuser} in
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  '' | no) ;;
  yes) gamegroup=games ;;
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  :*) gamegroup=${with_gameuser#:} ;;
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  *) gameuser=${with_gameuser} ;;
esac
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AC_ARG_WITH([gnustep-conf],dnl
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[AS_HELP_STRING([--with-gnustep-conf=FILENAME],
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   [name of GNUstep configuration file to use on systems where the command
    'gnustep-config' does not work; default $GNUSTEP_CONFIG_FILE, or
    /etc/GNUstep/GNUstep.conf])])
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test "X${with_gnustep_conf}" != X && test "${with_gnustep_conf}" != yes && \
  GNUSTEP_CONFIG_FILE="${with_gnustep_conf}"
test "X$GNUSTEP_CONFIG_FILE" = "X" && \
     GNUSTEP_CONFIG_FILE=/etc/GNUstep/GNUstep.conf

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AC_ARG_ENABLE(ns-self-contained,
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[AS_HELP_STRING([--disable-ns-self-contained],
                [disable self contained build under NeXTstep])],
   EN_NS_SELF_CONTAINED=$enableval,
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   EN_NS_SELF_CONTAINED=yes)

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locallisppathset=no
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AC_ARG_ENABLE(locallisppath,
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[AS_HELP_STRING([--enable-locallisppath=PATH],
                [directories Emacs should search for lisp files specific
		 to this site])],
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if test "${enableval}" = "no"; then
  locallisppath=
elif test "${enableval}" != "yes"; then
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  locallisppath=${enableval} locallisppathset=yes
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fi)

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AC_ARG_ENABLE(checking,
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[AS_HELP_STRING([--enable-checking@<:@=LIST@:>@],
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		[enable expensive checks.  With LIST,
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		 enable only specific categories of checks.
		 Categories are: all,yes,no.
		 Flags are: stringbytes, stringoverrun, stringfreelist,
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		 structs, xmallocoverrun, conslist, glyphs])],
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[ac_checking_flags="${enableval}"],[])
IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS="$IFS,"
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CHECK_STRUCTS=false
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for check in $ac_checking_flags
do
	case $check in
	# these set all the flags to specific states
	yes)		ac_enable_checking=1 ;;
	no)		ac_enable_checking= ;
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			CHECK_STRUCTS=false
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			ac_gc_check_stringbytes= ;
	                ac_gc_check_string_overrun= ;
	                ac_gc_check_string_free_list= ;
	                ac_xmalloc_overrun= ;
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	                ac_gc_check_cons_list= ;
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			ac_glyphs_debug= ;;
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	all)		ac_enable_checking=1 ;
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			CHECK_STRUCTS=true
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			ac_gc_check_stringbytes=1 ;
	                ac_gc_check_string_overrun=1 ;
	                ac_gc_check_string_free_list=1 ;
	                ac_xmalloc_overrun=1 ;
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	                ac_gc_check_cons_list=1 ;
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			ac_glyphs_debug=1 ;;
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	# these enable particular checks
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	stringbytes)	ac_gc_check_stringbytes=1 ;;
	stringoverrun)	ac_gc_check_string_overrun=1 ;;
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	stringfreelist) ac_gc_check_string_free_list=1 ;;
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	structs)	CHECK_STRUCTS=true ;;
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	xmallocoverrun)	ac_xmalloc_overrun=1 ;;
	conslist)	ac_gc_check_cons_list=1 ;;
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	glyphs)		ac_glyphs_debug=1 ;;
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	*)	AC_MSG_ERROR(unknown check category $check) ;;
	esac
done
IFS="$ac_save_IFS"

if test x$ac_enable_checking != x ; then
  AC_DEFINE(ENABLE_CHECKING, 1,
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[Define to 1 if expensive run-time data type and consistency checks are enabled.])
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fi
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if $CHECK_STRUCTS; then
  AC_DEFINE([CHECK_STRUCTS], 1,
    [Define this to check whether someone updated the portable dumper
     code after changing the layout of a structure that it uses.
     If you change one of these structures, check that the pdumper.c
     code is still valid, and update the pertinent hash in pdumper.c
     by manually copying the hash from the newly-generated dmpstruct.h.])
fi
AC_SUBST([CHECK_STRUCTS])
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if test x$ac_gc_check_stringbytes != x ; then
  AC_DEFINE(GC_CHECK_STRING_BYTES, 1,
[Define this temporarily to hunt a bug.  If defined, the size of
   strings is redundantly recorded in sdata structures so that it can
   be compared to the sizes recorded in Lisp strings.])
fi
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if test x$ac_gc_check_string_overrun != x ; then
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  AC_DEFINE(GC_CHECK_STRING_OVERRUN, 1,
[Define this to check for short string overrun.])
fi
if test x$ac_gc_check_string_free_list != x ; then
  AC_DEFINE(GC_CHECK_STRING_FREE_LIST, 1,
[Define this to check the string free list.])
fi
if test x$ac_xmalloc_overrun != x ; then
  AC_DEFINE(XMALLOC_OVERRUN_CHECK, 1,
[Define this to check for malloc buffer overrun.])
fi
if test x$ac_gc_check_cons_list != x ; then
  AC_DEFINE(GC_CHECK_CONS_LIST, 1,
[Define this to check for errors in cons list.])
fi
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if test x$ac_glyphs_debug != x ; then
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  AC_DEFINE(GLYPH_DEBUG, 1,
[Define this to enable glyphs debugging code.])
fi
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dnl The name of this option is unfortunate.  It predates, and has no
dnl relation to, the "sampling-based elisp profiler" added in 24.3.
dnl Actually, it stops it working.
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dnl https://lists.gnu.org/r/emacs-devel/2012-11/msg00393.html
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AC_ARG_ENABLE(profiling,
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[AS_HELP_STRING([--enable-profiling],
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		[build emacs with low-level, gprof profiling support.
                Mainly useful for debugging Emacs itself.  May not work on
                all platforms.  Stops profiler.el working.])],
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[ac_enable_profiling="${enableval}"],[])
if test x$ac_enable_profiling != x ; then
   PROFILING_CFLAGS="-DPROFILING=1 -pg"
else
   PROFILING_CFLAGS=
fi
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AC_SUBST(PROFILING_CFLAGS)
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AC_ARG_ENABLE(autodepend,
[AS_HELP_STRING([--enable-autodepend],
		[automatically generate dependencies to .h-files.
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		 Requires gcc, enabled if found.])],
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[ac_enable_autodepend="${enableval}"],[ac_enable_autodepend=yes])

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AC_ARG_ENABLE(gtk-deprecation-warnings,
[AS_HELP_STRING([--enable-gtk-deprecation-warnings],
		[Show Gtk+/Gdk deprecation warnings for Gtk+ >= 3.0])],
[ac_enable_gtk_deprecation_warnings="${enableval}"],[])

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BUILD_DETAILS=
AC_ARG_ENABLE([build-details],
  [AS_HELP_STRING([--disable-build-details],
		  [Make the build more deterministic by omitting host
		   names, time stamps, etc. from the output.])],
  [test "$enableval" = no && BUILD_DETAILS=--no-build-details])
AC_SUBST([BUILD_DETAILS])
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dnl This used to use changequote, but, apart from 'changequote is evil'
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dnl per the autoconf manual, we can speed up autoconf somewhat by quoting
dnl the great gob of text.  Thus it's not processed for possible expansion.
dnl Just make sure the brackets remain balanced.
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dnl
dnl Since Emacs can't find matching pairs of quotes, boundaries are
dnl indicated by comments.
dnl quotation begins
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[
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### If you add support for a new configuration, add code to this
### switch statement to recognize your configuration name and select
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### the appropriate opsys.

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### As far as handling version numbers on operating systems is
### concerned, make sure things will fail in a fixable way.  If
### /etc/MACHINES doesn't say anything about version numbers, be
### prepared to handle anything reasonably.  If version numbers
### matter, be sure /etc/MACHINES says something about it.

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opsys='' unported=no
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case "${canonical}" in

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  ## GNU/Linux and similar ports
  *-*-linux* )
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    opsys=gnu-linux
  ;;

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  ## FreeBSD ports
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  *-*-freebsd* )
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    opsys=freebsd
  ;;

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  ## DragonFly ports
  *-*-dragonfly* )
    opsys=dragonfly
  ;;

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  ## FreeBSD kernel + glibc based userland
  *-*-kfreebsd*gnu* )
    opsys=gnu-kfreebsd
  ;;

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  ## NetBSD ports
  *-*-netbsd* )
    opsys=netbsd
  ;;

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  ## OpenBSD ports
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  *-*-openbsd* | *-*-mirbsd* )
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    opsys=openbsd
  ;;

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  ## Apple Darwin / macOS
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  *-apple-darwin* )
    case "${canonical}" in
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      *-apple-darwin[0-9].*) unported=yes ;;
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      i[3456]86-* | x86_64-* )  ;;
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      * )            unported=yes ;;
    esac
    opsys=darwin
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    ## FIXME: Find a way to use Fink if available (Bug#11507).
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  ;;

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  ## Chromium Native Client
  *-nacl )
    opsys=nacl
  ;;

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  ## Cygwin ports
  *-*-cygwin )
    opsys=cygwin
  ;;

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  ## HP 9000 series 700 and 800, running HP/UX
  hppa*-hp-hpux10.2* )
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    opsys=hpux10-20
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  ;;
  hppa*-hp-hpux1[1-9]* )
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    opsys=hpux11
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    CFLAGS="-D_INCLUDE__STDC_A1_SOURCE $CFLAGS"
  ;;

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  ## IBM machines
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  rs6000-ibm-aix4.[23]* )
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    opsys=aix4-2
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  ;;
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  powerpc-ibm-aix4.[23]*  )
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    opsys=aix4-2
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  ;;
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  rs6000-ibm-aix[56]* )
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    opsys=aix4-2
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  ;;
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  powerpc-ibm-aix[5-9]* | powerpc-ibm-aix[1-9][0-9]* )
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    opsys=aix4-2
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  ;;
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  ## Suns
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  *-sun-solaris* \
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    | i[3456]86-*-solaris2* | i[3456]86-*-sunos5* \
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    | x86_64-*-solaris2*    | x86_64-*-sunos5*)
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    case "${canonical}" in
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      i[3456]86-*-* )   ;;
      amd64-*-*|x86_64-*-*) ;;
      sparc* )		;;
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      * )		unported=yes ;;
    esac
    case "${canonical}" in
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      *-sunos5.[1-9][0-9]* | *-solaris2.[1-9][0-9]* )
		opsys=sol2-10
		emacs_check_sunpro_c=yes
		;;
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      *-sunos5.[1-5]* | *-solaris2.[1-5]* ) unported=yes ;;
      ## Note that Emacs 23.1's NEWS said the following would be dropped.
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      *-sunos5.6* | *-solaris2.6* )
		opsys=sol2-6
		RANLIB="ar -ts"
		;;
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      ## 5.7 EOL Aug 2008, 5.8 EOL Mar 2012.
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      *-sunos5.[7-9]* | *-solaris2.[7-9]* )
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		opsys=sol2-6
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		emacs_check_sunpro_c=yes
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		;;
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    esac
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    ## Watch out for a compiler that we know will not work.
    case "${canonical}" in
     *-solaris* | *-sunos5* )
		if [ "x$CC" = x/usr/ucb/cc ]; then
		  ## /usr/ucb/cc doesn't work;
		  ## we should find some other compiler that does work.
		  unset CC
		fi
		;;
      *) ;;
    esac
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  ;;

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  ## QNX Neutrino
  *-nto-qnx* )
    opsys=qnxnto
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    test -z "$CC" && CC=qcc
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    CFLAGS="$CFLAGS -D__NO_EXT_QNX"
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    if test "$with_unexec" = yes; then
      LDFLAGS="-N2MB $LDFLAGS"
    fi
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  ;;

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  ## Intel 386 machines where we don't care about the manufacturer.
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  i[3456]86-*-* )
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    case "${canonical}" in
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      *-darwin* )               opsys=darwin ;;
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      *-mingw* )
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		opsys=mingw32
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		# MinGW overrides and adds some system headers in nt/inc.
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		GCC_TEST_OPTIONS="-I $srcdir/nt/inc"
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		;;
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      *-sysv4.2uw* )		opsys=unixware ;;
      *-sysv5uw* )		opsys=unixware ;;
      *-sysv5OpenUNIX* )	opsys=unixware ;;
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      ## Otherwise, we'll fall through to the generic opsys code at the bottom.
    esac
  ;;

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  # MinGW64
  x86_64-*-* )
    case "${canonical}" in
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      *-mingw* )
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		opsys=mingw32
		# MinGW overrides and adds some system headers in nt/inc.
		GCC_TEST_OPTIONS="-I $srcdir/nt/inc"
		;;
      ## Otherwise, we'll fall through to the generic opsys code at the bottom.
    esac
  ;;

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  * )
    unported=yes
  ;;
esac

### If the code above didn't choose an operating system, just choose
### an operating system based on the configuration name.  You really
### only want to use this when you have no idea what the right
### operating system is; if you know what operating systems a machine
### runs, it's cleaner to make it explicit in the case statement
### above.
if test x"${opsys}" = x; then
  case "${canonical}" in
    *-gnu* )				opsys=gnu ;;
    * )
      unported=yes
    ;;
  esac
fi

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]
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dnl quotation ends
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if test $unported = yes; then
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  AC_MSG_ERROR([Emacs does not support '${canonical}' systems.
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If you think it should, please send a report to ${PACKAGE_BUGREPORT}.
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Check 'etc/MACHINES' for recognized configuration names.])
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fi

#### Choose a compiler.
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dnl Don't bother to test for C89.
AC_DEFUN([_AC_PROG_CC_C89], [$2])

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dnl Sets GCC=yes if using gcc.
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AC_PROG_CC([gcc cc cl clang "$XCRUN gcc" "$XCRUN clang"])
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if test -n "$XCRUN"; then
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  AC_CHECK_PROGS(AR, [ar "$XCRUN ar"])
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  test -n "$AR" && export AR
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fi
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dnl Emacs needs C99 or later.
gl_PROG_CC_C99

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AC_PROG_CC_C_O
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if test x$GCC = xyes; then
  test "x$GCC_TEST_OPTIONS" != x && CC="$CC $GCC_TEST_OPTIONS"
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fi
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# Avoid gnulib's tests for -lcrypto, so that there's no static dependency on it.
AC_DEFUN([gl_CRYPTO_CHECK])
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# Avoid gnulib's tests for HAVE_WORKING_O_NOATIME and HAVE_WORKING_O_NOFOLLOW,
# as we don't use them.
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AC_DEFUN([gl_FCNTL_O_FLAGS])
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# Avoid gnulib's test for pthread_sigmask.
funcs=
for func in $ac_func_list; do
  test $func = pthread_sigmask || AS_VAR_APPEND([funcs], [" $func"])
done
ac_func_list=$funcs
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# Use the system putenv even if it lacks GNU features, as we don't need them,
# and the gnulib replacement runs afoul of a FreeBSD 10.1 bug; see Bug#19874.
AC_CHECK_FUNCS_ONCE([putenv])
AC_DEFUN([gl_FUNC_PUTENV],
  [test "$ac_cv_func_putenv" = yes || REPLACE_PUTENV=1])
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# Emacs does not use the wchar or wctype-h modules.
AC_DEFUN([gt_TYPE_WINT_T],
  [GNULIB_OVERRIDES_WINT_T=0
   AC_SUBST([GNULIB_OVERRIDES_WINT_T])])
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908
# Initialize gnulib right after choosing the compiler.
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dnl Amongst other things, this sets AR and ARFLAGS.
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gl_EARLY
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912
if test "$ac_test_CFLAGS" != set; then
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  # It's helpful to have C macros available to GDB, so prefer -g3 to -g
  # if -g3 works and the user does not specify CFLAGS.
  # This test must follow gl_EARLY; otherwise AC_LINK_IFELSE complains.
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  case $CFLAGS in
    '-g')
      emacs_g3_CFLAGS='-g3';;
    '-g -O2')
      emacs_g3_CFLAGS='-g3 -O2';;
    *)
      emacs_g3_CFLAGS='';;
  esac
  if test -n "$emacs_g3_CFLAGS"; then
    emacs_save_CFLAGS=$CFLAGS
    CFLAGS=$emacs_g3_CFLAGS
    AC_CACHE_CHECK([whether $CC accepts $emacs_g3_CFLAGS],
      [emacs_cv_prog_cc_g3],
      [AC_LINK_IFELSE([AC_LANG_PROGRAM()],
	 [emacs_cv_prog_cc_g3=yes],
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	 [emacs_cv_prog_cc_g3=no])])
    if test $emacs_cv_prog_cc_g3 != yes; then
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      CFLAGS=$emacs_save_CFLAGS
    fi
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    if test $opsys = mingw32; then
      CFLAGS="$CFLAGS -gdwarf-2"
    fi
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  fi
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  case $CFLAGS in
    *-O*) ;;
    *)
      # No optimization flag was inferred for this non-GCC compiler.
      # Try -O.  This is needed for xlc on AIX; see Bug#14258.
      emacs_save_CFLAGS=$CFLAGS
      test -z "$CFLAGS" || CFLAGS="$CFLAGS "
      CFLAGS=${CFLAGS}-O
      AC_CACHE_CHECK([whether $CC accepts -O],
        [emacs_cv_prog_cc_o],
	[AC_LINK_IFELSE([AC_LANG_PROGRAM()],
	   [emacs_cv_prog_cc_o=yes],
	   [emacs_cv_prog_cc_o=no])])
      if test $emacs_cv_prog_cc_o != yes; then
	CFLAGS=$emacs_save_CFLAGS
      fi ;;
  esac
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fi

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# gl_GCC_VERSION_IFELSE([major], [minor], [run-if-found], [run-if-not-found])
# ---------------------------------------------------------------------------
# If $CPP is gcc-MAJOR.MINOR or newer, then run RUN-IF-FOUND.
# Otherwise, run RUN-IF-NOT-FOUND.
AC_DEFUN([gl_GCC_VERSION_IFELSE],
  [AC_PREPROC_IFELSE(
    [AC_LANG_PROGRAM(
      [[
#if ($1) < __GNUC__ || (($1) == __GNUC__ && ($2) <= __GNUC_MINOR__)
/* ok */
#else
# error "your version of gcc is older than $1.$2"
#endif
      ]]),
    ], [$3], [$4])
  ]
)

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AC_ARG_ENABLE([gcc-warnings],
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  [AS_HELP_STRING([--enable-gcc-warnings@<:@=TYPE@:>@],
                  [control generation of GCC warnings.  The TYPE 'yes'
		   means to fail if any warnings are issued; 'warn-only'
		   means issue warnings without failing (default for
		   developer builds); 'no' means disable warnings
		   (default for non-developer builds).])],
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  [case $enableval in
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     yes|no|warn-only) ;;
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     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
   esac
   gl_gcc_warnings=$enableval],
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  [# By default, use 'warn-only' if it looks like the invoker of 'configure'
   # is a developer as opposed to a builder.  This is most likely true
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   # if GCC is recent enough and there is a .git directory or file;
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   # however, if there is also a .tarball-version file it is probably
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   # just a release imported into Git for patch management.
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   gl_gcc_warnings=no
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   if test -e "$srcdir"/.git && test ! -f "$srcdir"/.tarball-version; then
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     gl_GCC_VERSION_IFELSE([5], [3], [gl_gcc_warnings=warn-only])
   fi])

AC_ARG_ENABLE([check-lisp-object-type],
  [AS_HELP_STRING([--enable-check-lisp-object-type],
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     [Enable compile time checks for the Lisp_Object data type,
      which can catch some bugs during development.])])
if test "$enable_check_lisp_object_type" = yes; then
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  AC_DEFINE([CHECK_LISP_OBJECT_TYPE], 1,
    [Define to enable compile-time checks for the Lisp_Object data type.])
fi
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# clang is unduly picky about some things.
AC_CACHE_CHECK([whether the compiler is clang], [emacs_cv_clang],
  [AC_COMPILE_IFELSE(
     [AC_LANG_PROGRAM([[
	  #ifndef __clang__
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	    error "not clang";
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	  #endif
        ]])],
     [emacs_cv_clang=yes],
     [emacs_cv_clang=no])])
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WERROR_CFLAGS=
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# When compiling with GCC, prefer -isystem to -I when including system
# include files, to avoid generating useless diagnostics for the files.
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AS_IF([test $gl_gcc_warnings = no],
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 [
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  isystem='-I'
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  AS_IF([test "$emacs_cv_clang" = yes],
   [
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     # Turn off some warnings if supported.
     gl_WARN_ADD([-Wno-switch])
     gl_WARN_ADD([-Wno-pointer-sign])
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     gl_WARN_ADD([-Wno-string-plus-int])
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     gl_WARN_ADD([-Wno-unknown-attributes])
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   ])
 ],[
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  isystem='-isystem '

  # This, $nw, is the list of warnings we disable.
  nw=

  case $with_x_toolkit in
    lucid | athena | motif)
       # Old toolkits mishandle 'const'.
       nw="$nw -Wwrite-strings"
       ;;
  esac
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  AS_IF([test $gl_gcc_warnings = yes],
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    [WERROR_CFLAGS=-Werror])
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  nw="$nw -Wcast-align -Wcast-align=strict" # Emacs is tricky with pointers.
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  nw="$nw -Wduplicated-branches"    # Too many false alarms
  nw="$nw -Wformat-overflow=2"      # False alarms due to GCC bug 80776
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  nw="$nw -Wsystem-headers"         # Don't let system headers trigger warnings
  nw="$nw -Woverlength-strings"     # Not a problem these days
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  nw="$nw -Wformat-nonliteral"      # we do this a lot
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  nw="$nw -Wvla"                    # Emacs uses <vla.h>.
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  nw="$nw -Wunused-const-variable=2" # lisp.h declares const objects.
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  nw="$nw -Winline"                 # OK to ignore 'inline'
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  nw="$nw -Wstrict-overflow"        # OK to optimize assuming that
                                    # signed overflow has undefined behavior
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  nw="$nw -Wsync-nand"              # irrelevant here, and provokes ObjC warning
  nw="$nw -Wunsafe-loop-optimizations" # OK to suppress unsafe optimizations
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  nw="$nw -Wbad-function-cast"      # These casts are no worse than others.
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  nw="$nw -Wabi"                    # Not useful, perceived as noise
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  # Emacs doesn't care about shadowing; see
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  # <https://lists.gnu.org/r/emacs-diffs/2011-11/msg00265.html>.
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  nw="$nw -Wshadow"

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  # Emacs's use of alloca inhibits protecting the stack.
  nw="$nw -Wstack-protector"

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  # Emacs's use of __attribute__ ((cold)) causes false alarms with this option.
  nw="$nw -Wsuggest-attribute=cold"

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  # Emacs's use of partly-const functions such as Fgnutls_available_p
  # make this option problematic.
  nw="$nw -Wsuggest-attribute=const"

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  # Emacs's use of partly-pure functions such as CHECK_TYPE make this
  # option problematic.
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  nw="$nw -Wsuggest-attribute=pure"

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  # This part is merely for shortening the command line,
  # since -Wall implies -Wswitch.
  nw="$nw -Wswitch"

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  # This part is merely for shortening the command line,
  # since -Wno-FOO needs to be added below regardless.
  nw="$nw -Wmissing-field-initializers"
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  nw="$nw -Woverride-init"
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  nw="$nw -Wtype-limits"
  nw="$nw -Wunused-parameter"

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  if test "$emacs_cv_clang" = yes; then
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    nw="$nw -Wcast-align"
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    nw="$nw -Wdouble-promotion"
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    nw="$nw -Wmissing-braces"
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  fi

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  # These cause too much noise in the MinGW build
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  if test $opsys = mingw32; then
    nw="$nw -Wpointer-sign"
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    nw="$nw -Wsuggest-attribute=format"
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  fi

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  gl_MANYWARN_ALL_GCC([ws])
  gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
  for w in $ws; do
    gl_WARN_ADD([$w])
  done
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  gl_WARN_ADD([-Wredundant-decls])     # Prefer this, as we don't use Bison.
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  gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one
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  gl_WARN_ADD([-Wno-override-init])    # More trouble than it is worth
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  gl_WARN_ADD([-Wno-sign-compare])     # Too many warnings for now
  gl_WARN_ADD([-Wno-type-limits])      # Too many warnings for now
  gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
  gl_WARN_ADD([-Wno-format-nonliteral])
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  # clang is unduly picky about some things.
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  if test "$emacs_cv_clang" = yes; then
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    gl_WARN_ADD([-Wno-missing-braces])
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    gl_WARN_ADD([-Wno-null-pointer-arithmetic])
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  fi

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  # This causes too much noise in the MinGW build
  if test $opsys = mingw32; then
    gl_WARN_ADD([-Wno-pointer-sign])
  fi

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  AC_DEFINE([GCC_LINT], [1], [Define to 1 if --enable-gcc-warnings.])
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  AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])
  AH_VERBATIM([GNULIB_PORTCHECK_FORTIFY_SOURCE],
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  [/* Enable compile-time and run-time bounds-checking, and some warnings,
      without upsetting glibc 2.15+. */
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   #if (defined GNULIB_PORTCHECK && !defined _FORTIFY_SOURCE \
        && defined __OPTIMIZE__ && __OPTIMIZE__)
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   # define _FORTIFY_SOURCE 2
   #endif
  ])
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 ])
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# clang is picky about these regardless of whether
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# --enable-gcc-warnings is specified.
if test "$emacs_cv_clang" = yes; then
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  gl_WARN_ADD([-Wno-initializer-overrides])
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  gl_WARN_ADD([-Wno-tautological-compare])
  gl_WARN_ADD([-Wno-tautological-constant-out-of-range-compare])
fi
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# Use a slightly smaller set of warning options for lib/.
nw=
nw="$nw -Wunused-macros"
gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])

AC_SUBST([WERROR_CFLAGS])
AC_SUBST([GNULIB_WARN_CFLAGS])
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edit_cflags="
  s,///*,/,g
  s/^/ /
  s/ -I/ $isystem/g
  s/^ //
"
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AC_ARG_ENABLE(link-time-optimization,
[AS_HELP_STRING([--enable-link-time-optimization],
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                [build with link-time optimization
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		 (experimental; see INSTALL)])],
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if test "${enableval}" != "no"; then
   ac_lto_supported=no
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   if test "$emacs_cv_clang" = yes; then
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      AC_MSG_CHECKING([whether link-time optimization is supported by clang])
      GOLD_PLUGIN=`$CC -print-file-name=LLVMgold.so 2>/dev/null`
      if test -x "$GOLD_PLUGIN"; then
	 LTO="-flto"
      fi
   elif test x$GCC = xyes; then
      AC_MSG_CHECKING([whether link-time optimization is supported by gcc])
      CPUS=`getconf _NPROCESSORS_ONLN 2>/dev/null`
      if test x$CPUS != x; then
	 LTO="-flto=$CPUS"
      else
	 LTO="-flto"
      fi
   else
      AC_MSG_ERROR([Link-time optimization is not supported with your compiler.])
   fi
   if test -z "$LTO"; then
      ac_lto_supported=no
   else
      old_CFLAGS=$CFLAGS
      CFLAGS="$CFLAGS $LTO"
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
         [ac_lto_supported=yes], [ac_lto_supported=no])
         CFLAGS="$old_CFLAGS"
   fi
   AC_MSG_RESULT([$ac_lto_supported])
   if test "$ac_lto_supported" = "yes"; then
      CFLAGS="$CFLAGS $LTO"
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      if test "$emacs_cv_clang" = yes; then
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	 AC_MSG_WARN([Please read INSTALL before using link-time optimization with clang])
	 # WARNING: 'ar --plugin ...' doesn't work without
	 # command, so plugin name is appended to ARFLAGS.
	 ARFLAGS="cru --plugin $GOLD_PLUGIN"
	 RANLIB="$RANLIB --plugin $GOLD_PLUGIN"
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      else
        dnl The following is needed for GCC 4.9.0.  The GCC 4.9.0 release notes
        dnl suggest that instead of -ffat-lto-objects we should use gcc-ar and
        dnl gcc-ranlib in place of ar and ranlib, but gcc-ar makes /usr/bin/ar
        dnl dump core on Fedora 20, so play it safe for now.
        gl_COMPILER_OPTION_IF([-ffat-lto-objects],
          [CFLAGS="$CFLAGS -ffat-lto-objects"])
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      fi
   fi
fi)
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