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dnl  Autoconf script for GNU Emacs
dnl To rebuild the `configure' script from this, execute the command
dnl 	autoconf
dnl in the directory containing this script.
dnl If you changed any AC_DEFINES, also run autoheader.
dnl
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dnl Copyright (C) 1994-1996, 1999-2014 Free Software Foundation, Inc.
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dnl
dnl  This file is part of GNU Emacs.
dnl
dnl  GNU Emacs is free software: you can redistribute it and/or modify
dnl  it under the terms of the GNU General Public License as published by
dnl  the Free Software Foundation, either version 3 of the License, or
dnl  (at your option) any later version.
dnl
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.
dnl
dnl  You should have received a copy of the GNU General Public License
dnl  along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

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, 25.0.50, bug-gnu-emacs@gnu.org)
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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 ${1+"$@"} CFLAGS CPPFLAGS LDFLAGS; do
  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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dnl automake 1.13 and later understand this, making -I m4 unnecessary.
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dnl With older versions this is a no-op.
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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 GNU Make is required, so don't test for its individual features.
am_cv_make_support_nested_variables=yes
AC_DEFUN([AC_PROG_MAKE_SET],
  [SET_MAKE=
   AC_SUBST([SET_MAKE])])

dnl Check for GNU Make and possibly set MAKE before running AM_INIT_AUTOMAKE.
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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 Fairly arbitrary, older versions might work too.
AM_INIT_AUTOMAKE(1.11)
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dnl Canonicalize the configuration name.
AC_CANONICAL_HOST
canonical=$host
configuration=${host_alias-${build_alias-$host}}

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dnl We get MINGW64 with MSYS2, MINGW32 with MSYS.
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case $canonical in
 *-mingw*)
  . $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).
      eval 'srcdir="/${srcdir:0:1}${srcdir:2}"'
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      ;;
  esac;;
esac

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dnl Support for --program-prefix, --program-suffix and
dnl --program-transform-name options
AC_ARG_PROGRAM

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.
lispdir='${datadir}/emacs/${version}/lisp'
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standardlisppath='${lispdir}'
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locallisppath='${datadir}/emacs/${version}/site-lisp:'\
'${datadir}/emacs/site-lisp'
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lisppath='${locallisppath}:${standardlisppath}'
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etcdir='${datadir}/emacs/${version}/etc'
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
])dnl

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

OPTION_DEFAULT_ON([pop],[don't support POP mail retrieval with movemail])
if test "$with_pop" = yes; then
   AC_DEFINE(MAIL_USE_POP)
fi
AH_TEMPLATE(MAIL_USE_POP, [Define to support POP mail retrieval.])dnl

OPTION_DEFAULT_OFF([kerberos],[support Kerberos-authenticated POP])
if test "$with_kerberos" != no; then
   AC_DEFINE(KERBEROS)
fi
AH_TEMPLATE(KERBEROS,
	    [Define to support Kerberos-authenticated POP mail retrieval.])dnl

OPTION_DEFAULT_OFF([kerberos5],[support Kerberos version 5 authenticated POP])
if test "${with_kerberos5}" != no; then
  if test "${with_kerberos}" = no; then
    with_kerberos=yes
    AC_DEFINE(KERBEROS)
  fi
  AC_DEFINE(KERBEROS5, 1, [Define to use Kerberos 5 instead of Kerberos 4.])
fi

OPTION_DEFAULT_OFF([hesiod],[support Hesiod to get the POP server host])
dnl FIXME hesiod support may not be present, so it seems like an error
dnl to define, or at least use, this unconditionally.
if test "$with_hesiod" != no; then
  AC_DEFINE(HESIOD, 1, [Define to support using a Hesiod database to find the POP server.])
fi

OPTION_DEFAULT_OFF([mmdf],[support MMDF mailboxes])
if test "$with_mmdf" != no; then
   AC_DEFINE(MAIL_USE_MMDF, 1, [Define to support MMDF mailboxes in movemail.])
fi

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=$withval' is invalid;
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this option's value should be `yes', `no', `alsa', `oss', or `bsd-ossaudio'.])
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      ;;
    esac
    with_sound=$val
  ],
  [with_sound=$with_features])
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dnl FIXME currently it is not the last.
dnl This should be the last --with option, because --with-x is
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dnl added later on when we find the file name of X, and it's best to
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dnl keep them together visually.
AC_ARG_WITH([x-toolkit],[AS_HELP_STRING([--with-x-toolkit=KIT],
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 [use an X toolkit (KIT one of: yes or gtk, gtk2, gtk3, lucid or athena, motif, no)])],
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[	  case "${withval}" in
	    y | ye | yes )	val=gtk ;;
	    n | no )		val=no  ;;
	    l | lu | luc | luci | lucid )	val=lucid ;;
	    a | at | ath | athe | athen | athena )	val=athena ;;
	    m | mo | mot | moti | motif )	val=motif ;;
	    g | gt | gtk  )	val=gtk ;;
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	    gtk2  )	val=gtk2 ;;
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	    gtk3  )	val=gtk3 ;;
	    * )
AC_MSG_ERROR([`--with-x-toolkit=$withval' is invalid;
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this option's value should be `yes', `no', `lucid', `athena', `motif', `gtk',
`gtk2' or `gtk3'.  `yes' and `gtk' are synonyms.
`athena' and `lucid' are synonyms.])
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	    ;;
	  esac
	  with_x_toolkit=$val
])

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OPTION_DEFAULT_OFF([wide-int], [prefer wide Emacs integers (typically 62-bit)])
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])
OPTION_DEFAULT_ON([xml2],[don't compile with XML parsing support])
OPTION_DEFAULT_ON([imagemagick],[don't compile with ImageMagick image support])

OPTION_DEFAULT_ON([xft],[don't use XFT for anti aliased fonts])
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])

OPTION_DEFAULT_ON([toolkit-scroll-bars],[don't use Motif or Xaw3d scroll bars])
OPTION_DEFAULT_ON([xaw3d],[don't use Xaw3d])
OPTION_DEFAULT_ON([xim],[don't use X11 XIM])
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OPTION_DEFAULT_OFF([ns],[use NeXTstep (Cocoa or GNUstep) windowing system])
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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])
OPTION_DEFAULT_ON([dbus],[don't compile with D-Bus support])
OPTION_DEFAULT_ON([gconf],[don't compile with GConf support])
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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])
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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AC_ARG_WITH([file-notification],[AS_HELP_STRING([--with-file-notification=LIB],
 [use a file notification library (LIB one of: yes, gfile, inotify, w32, no)])],
 [ case "${withval}" in
    y | ye | yes )	val=yes ;;
    n | no )		val=no  ;;
    g | gf | gfi | gfil | gfile )	val=gfile ;;
    i | in | ino | inot | inoti | inotif | inotify )	val=inotify ;;
    w | w3 | w32 )	val=w32 ;;
    * ) AC_MSG_ERROR([`--with-file-notification=$withval' is invalid;
this option's value should be `yes', `no', `gfile', `inotify' or `w32'.
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`yes' is a synonym for `w32' on MS-Windows, for `no' on Nextstep,
otherwise for the first of `gfile' or `inotify' 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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## For the times when you want to build Emacs but don't have
## a suitable makeinfo, and can live without the manuals.
dnl http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg01844.html
OPTION_DEFAULT_ON([makeinfo],[don't require makeinfo for building manuals])

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## This might be a 'configure' arg.
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AC_SUBST([ACLOCAL_PATH])

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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
[AS_HELP_STRING([--with-gameuser=USER],[user for shared game score files])])
test "X${with_gameuser}" != X && test "${with_gameuser}" != yes \
  && gameuser="${with_gameuser}"
test "X$gameuser" = X && gameuser=games

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AC_ARG_WITH([gnustep-conf],dnl
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[AS_HELP_STRING([--with-gnustep-conf=FILENAME],
   [name of GNUstep.conf; 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

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

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

AC_ARG_ENABLE(checking,
[AS_HELP_STRING([--enable-checking@<:@=LIST@:>@],
		[enable expensive run-time checks.  With LIST,
		 enable only specific categories of checks.
		 Categories are: all,yes,no.
		 Flags are: stringbytes, stringoverrun, stringfreelist,
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		 xmallocoverrun, conslist, glyphs])],
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[ac_checking_flags="${enableval}"],[])
IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS="$IFS,"
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= ;
			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 ;
			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
	stringbytes) 	ac_gc_check_stringbytes=1 ;;
	stringoverrun) 	ac_gc_check_string_overrun=1 ;;
	stringfreelist) ac_gc_check_string_free_list=1 ;;
	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$ac_enable_checking != x ; then
  AC_DEFINE(ENABLE_CHECKING, 1,
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[Define to 1 if expensive run-time data type and consistency checks are enabled.])
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fi
if test x$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$ac_glyphs_debug != x ; then
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  AC_DEFINE(GLYPH_DEBUG, 1,
[Define this to enable glyphs debugging code.])
fi
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AC_ARG_ENABLE(check-lisp-object-type,
[AS_HELP_STRING([--enable-check-lisp-object-type],
                [enable compile time checks for the Lisp_Object data type.
		This is useful for development for catching certain types of bugs.])],
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if test "${enableval}" != "no"; then
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   AC_DEFINE(CHECK_LISP_OBJECT_TYPE, 1,
   [Define this to enable compile time checks for the Lisp_Object data type.])
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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.
dnl http://lists.gnu.org/archive/html/emacs-devel/2012-11/msg00393.html
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AC_ARG_ENABLE(profiling,
[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
AC_SUBST(PROFILING_CFLAGS)

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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dnl This used to use changequote, but, apart from `changequote is evil'
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.
dnl
dnl Since Emacs can't find matching pairs of quotes, boundaries are
dnl indicated by comments.
dnl quotation begins
[

### 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
  *-*-freebsd* )
    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
  ;;

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

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

  ## Apple Darwin / Mac OS X
  *-apple-darwin* )
    case "${canonical}" in
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      *-apple-darwin[0-9].*) unported=yes ;;
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      i[3456]86-* | x86_64-* )  ;;
      * )            unported=yes ;;
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    esac
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    opsys=darwin
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    ## Use fink packages if available.
    ## FIXME find a better way to do this: http://debbugs.gnu.org/11507
##    if test -d /sw/include && test -d /sw/lib; then
##      GCC_TEST_OPTIONS="-I/sw/include -L/sw/lib"
##      NON_GCC_TEST_OPTIONS=${GCC_TEST_OPTIONS}
##    fi
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  ;;

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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"
  ;;

  ## IBM machines
  rs6000-ibm-aix4.[23]* )
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    opsys=aix4-2
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  ;;
  powerpc-ibm-aix4.[23]*  )
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    opsys=aix4-2
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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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  ;;

  ## Silicon Graphics machines
  ## Iris 4D
  mips-sgi-irix6.5 )
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    opsys=irix6-5
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    # Without defining _LANGUAGE_C, things get masked out in the headers
    # so that, for instance, grepping for `free' in stdlib.h fails and
    # AC_HEADER_STD_C fails.   (MIPSPro 7.2.1.2m compilers, Irix 6.5.3m).
    NON_GCC_TEST_OPTIONS="-D_LANGUAGE_C"
  ;;

  ## Suns
  *-sun-solaris* \
    | i[3456]86-*-solaris2* | i[3456]86-*-sunos5* \
    | x86_64-*-solaris2*    | x86_64-*-sunos5*)
    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]* )
		opsys=sol2-6
		emacs_check_sunpro_c=yes
		;;
    esac
    ## 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
  ;;

  ## Intel 386 machines where we don't care about the manufacturer.
  i[3456]86-*-* )
    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

]
dnl quotation ends

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.])
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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AM_PROG_CC_C_O

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if test x$GCC = xyes; then
  test "x$GCC_TEST_OPTIONS" != x && CC="$CC $GCC_TEST_OPTIONS"
else
  test "x$NON_GCC_TEST_OPTIONS" != x && CC="$CC $NON_GCC_TEST_OPTIONS"
fi

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dnl This is used in lib/Makefile.am to use nt/gnulib.mk, the
dnl alternative to lib/gnulib.mk, so as to avoid generating header files
dnl that clash with MinGW.
AM_CONDITIONAL([BUILDING_FOR_WINDOWSNT], [test "x$opsys" = "xmingw32"])

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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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# 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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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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AC_ARG_ENABLE([gcc-warnings],
  [AS_HELP_STRING([--enable-gcc-warnings],
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                  [turn on lots of GCC warnings/errors. This is intended for
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		   developers, and may generate false alarms when used
		   with older or non-GNU development tools.])],
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  [case $enableval in
     yes|no) ;;
     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
   esac
   gl_gcc_warnings=$enableval],
  [gl_gcc_warnings=no]
)

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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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# When compiling with GCC, prefer -isystem to -I when including system
# include files, to avoid generating useless diagnostics for the files.
if test "$gl_gcc_warnings" != yes; then
  isystem='-I'
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  if test "$emacs_cv_clang" = yes
  then
     # Turn off some warnings if supported.
     gl_WARN_ADD([-Wno-switch])
     gl_WARN_ADD([-Wno-tautological-constant-out-of-range-compare])
     gl_WARN_ADD([-Wno-pointer-sign])
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     gl_WARN_ADD([-Wno-string-plus-int])
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  fi
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else
  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"
       ;;
    *)
       gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
       ;;
  esac
  AC_SUBST([WERROR_CFLAGS])

  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="$nw -Wswitch-default"         # Too many warnings for now
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  nw="$nw -Winline"                 # OK to ignore 'inline'
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  nw="$nw -Wjump-misses-init"       # We sometimes safely jump over init.
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  nw="$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="$nw -Wbad-function-cast"      # These casts are no worse than others.
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  # Emacs doesn't care about shadowing; see
  # <http://lists.gnu.org/archive/html/emacs-diffs/2011-11/msg00265.html>.
  nw="$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 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 -Wno-FOO needs to be added below regardless.
  nw="$nw -Wmissing-field-initializers"
  nw="$nw -Wswitch"
  nw="$nw -Wtype-limits"
  nw="$nw -Wunused-parameter"

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  if test $emacs_cv_clang = yes; then
    nw="$nw -Wcast-align"
  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
  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-switch])           # 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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  # More things that clang is unduly picky about.
  if test $emacs_cv_clang = yes; then
    gl_WARN_ADD([-Wno-format-extra-args])
    gl_WARN_ADD([-Wno-tautological-constant-out-of-range-compare])
    gl_WARN_ADD([-Wno-unused-command-line-argument])
    gl_WARN_ADD([-Wno-unused-value])
  fi

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  AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
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  AH_VERBATIM([FORTIFY_SOURCE],
  [/* Enable compile-time and run-time bounds-checking, and some warnings,
      without upsetting glibc 2.15+. */
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   #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
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   # define _FORTIFY_SOURCE 2
   #endif
  ])
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  AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])

  # We use a slightly smaller set of warning options for lib/.
  # Remove the following and save the result in GNULIB_WARN_CFLAGS.
  nw=
  nw="$nw -Wunused-macros"

  gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])
  AC_SUBST([GNULIB_WARN_CFLAGS])
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fi

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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],
                [build emacs with link-time optimization.
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		 This requires GCC 4.5.0 or later, or clang.
		 (Note that clang support is experimental - see INSTALL.)
		 It also makes Emacs harder to debug, and when we tried it
		 with GCC 4.9.0 x86-64 it made Emacs slower, so it's not
		 recommended for typical use.])],
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if test "${enableval}" != "no"; then
   ac_lto_supported=no
   if test $emacs_cv_clang = yes; then
      AC_MSG_CHECKING([whether link-time optimization is supported by clang])
      GOLD_PLUGIN=`$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 $LTO"
      if test x$emacs_cv_clang = xyes; then
	 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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dnl Port to Automake 1.11.
dnl This section can be removed once we assume Automake 1.14 or later.
: ${AM_DEFAULT_VERBOSITY=1}
: ${AM_V=$AM_DEFAULT_VERBOSITY}
: ${AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY}
AC_SUBST([AM_V])
AM_SUBST_NOTMAKE([AM_V])
AC_SUBST([AM_DEFAULT_V])
AM_SUBST_NOTMAKE([AM_DEFAULT_V])
AC_SUBST([AM_DEFAULT_VERBOSITY])

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dnl Some other nice autoconf tests.
dnl These are commented out, since gl_EARLY and/or Autoconf already does them.
dnl AC_PROG_INSTALL
dnl AC_PROG_MKDIR_P
dnl if test "x$RANLIB" = x; then
dnl   AC_PROG_RANLIB
dnl fi
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dnl Sadly, AC_PROG_LN_S is too restrictive.  It also tests whether links
dnl can be made to directories.  This is not relevant for our usage, and
dnl excludes some cases that work fine for us.  Eg MS Windows or files
dnl hosted on AFS, both examples where simple links work, but links to
dnl directories fail.  We use a cut-down version instead.
dnl AC_PROG_LN_S

AC_MSG_CHECKING([whether ln -s works for files in the same directory])
rm -f conf$$ conf$$.file

LN_S_FILEONLY='cp -p'

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dnl On MinGW, ensure we will call the MSYS /bin/ln.exe, not some
dnl random program in the current directory.
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if (echo >conf$$.file) 2>/dev/null; then
  if ln -s conf$$.file conf$$ 2>/dev/null; then
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    if test "$opsys" = "mingw32"; then
      LN_S_FILEONLY='/bin/ln -s'
    else
      LN_S_FILEONLY='ln -s'
    fi
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  elif ln conf$$.file conf$$ 2>/dev/null; then
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    if test "$opsys" = "mingw32"; then
      LN_S_FILEONLY=/bin/ln
    else
      LN_S_FILEONLY=ln
    fi
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  fi
fi

rm -f conf$$ conf$$.file

if test "$LN_S_FILEONLY" = "ln -s"; then
   AC_MSG_RESULT([yes])
else
   AC_MSG_RESULT([no, using $LN_S_FILEONLY])
fi

AC_SUBST(LN_S_FILEONLY)

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dnl AC_PROG_LN_S sets LN_S to 'cp -pR' for MinGW, on the premise that 'ln'
dnl doesn't support links to directories, as in "ln file dir".  But that
dnl use is non-portable, and OTOH MinGW wants to use hard links for Emacs
dnl executables at "make install" time.
dnl See http://lists.gnu.org/archive/html/emacs-devel/2013-04/msg00475.html
dnl for more details.
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if test "$opsys" = "mingw32"; then
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  LN_S="/bin/ln"
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fi

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dnl On some Debian versions, "install-info" prints irritating messages
dnl "This is not dpkg install-info anymore, but GNU install-info"
dnl if called via an absolute file name.
dnl Use the entirely-identical-but-quieter ginstall-info instead if present.
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dnl Sadly some people may have an old ginstall-info installed on
dnl non-Debian systems, so we can't use this.
dnl AC_PATH_PROGS(INSTALL_INFO, [ginstall-info install-info], :,
dnl   $PATH$PATH_SEPARATOR/usr/sbin$PATH_SEPARATOR/sbin)

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AC_PATH_PROG(INSTALL_INFO, install-info, :,
  $PATH$PATH_SEPARATOR/usr/sbin$PATH_SEPARATOR/sbin)
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dnl Don't use GZIP, which is used by gzip for additional parameters.
AC_PATH_PROG(GZIP_PROG, gzip)

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test $with_compress_install != yes && test -n "$GZIP_PROG" && \
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   GZIP_PROG=" # $GZIP_PROG # (disabled by configure --without-compress-install)"

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if test $opsys = gnu-linux; then
  AC_PATH_PROG(PAXCTL, paxctl,,
    [$PATH$PATH_SEPARATOR/sbin$PATH_SEPARATOR/usr/sbin])
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  if test "X$PAXCTL" != X; then
    AC_MSG_CHECKING([whether binaries have a PT_PAX_FLAGS header])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
      [if $PAXCTL -v conftest$EXEEXT >/dev/null 2>&1; then AC_MSG_RESULT(yes)
      else AC_MSG_RESULT(no); PAXCTL=""; fi])
  fi
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  if test "${SETFATTR+set}" != set; then
    AC_CACHE_CHECK([for setfattr],
      [emacs_cv_prog_setfattr],
      [touch conftest.tmp
       if (setfattr -n user.pax.flags conftest.tmp) >/dev/null 2>&1; then
	 emacs_cv_prog_setfattr=yes
       else
	 emacs_cv_prog_setfattr=no
       fi])
    if test "$emacs_cv_prog_setfattr" = yes; then
      SETFATTR=setfattr
    else
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      SETFATTR=
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    fi
    rm -f conftest.tmp
    AC_SUBST([SETFATTR])
  fi
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fi
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## Need makeinfo >= 4.7 (?) to build the manuals.
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if test "$MAKEINFO" != "no"; then
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  if test "$MAKEINFO" = "${am_missing_run}makeinfo"; then
    MAKEINFO=makeinfo
  fi
  case `($MAKEINFO --version) 2>/dev/null` in
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    *' (GNU texinfo) '4.[[7-9]]* | \
    *' (GNU texinfo) '4.[[1-9][0-9]]* | \
    *' (GNU texinfo) '[[5-9]]* | \
    *' (GNU texinfo) '[[1-9][0-9]]* ) ;;
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    *) MAKEINFO=no;;
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  esac
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fi

## Makeinfo is unusual.  For a released Emacs, the manuals are
## pre-built, and not deleted by the normal clean rules.  makeinfo is
## therefore in the category of "special tools" not normally required, which
## configure does not have to check for (eg autoconf itself).
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## In a repository checkout on the other hand, the manuals are not included.
## So makeinfo is a requirement to build from the repository, and configure
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## should test for it as it does for any other build requirement.
## We use the presence of $srcdir/info/emacs to distinguish a release,
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## with pre-built manuals, from a repository checkout.
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HAVE_MAKEINFO=yes

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if test "$MAKEINFO" = "no"; then
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  MAKEINFO=makeinfo
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  if test "x${with_makeinfo}" = "xno"; then
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    HAVE_MAKEINFO=no
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  elif test ! -e "$srcdir/info/emacs" && test ! -e "$srcdir/info/emacs.info"; then
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    AC_MSG_ERROR( [You do not seem to have makeinfo >= 4.7, and your
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source tree does not seem to have pre-built manuals in the `info' directory.
Either install a suitable version of makeinfo, or re-run configure
with the `--without-makeinfo' option to build without the manuals.] )
  fi
fi
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AC_SUBST(HAVE_MAKEINFO)
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if test $opsys = mingw32; then
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   DOCMISC_W32=efaq-w32
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else
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   DOCMISC_W32=
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fi
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AC_SUBST(DOCMISC_W32)
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dnl Add our options to ac_link now, after it is set up.

if test x$GCC = xyes; then
  test "x$GCC_LINK_TEST_OPTIONS" != x && \
    ac_link="$ac_link $GCC_LINK_TEST_OPTIONS"
else
  test "x$NON_GCC_LINK_TEST_OPTIONS" != x && \
    ac_link="$ac_link $NON_GCC_LINK_TEST_OPTIONS"
fi

dnl We need -znocombreloc if we're using a relatively recent GNU ld.
dnl If we can link with the flag, it shouldn't do any harm anyhow.
dnl (Don't use `-z nocombreloc' as -z takes no arg on Irix.)
dnl Treat GCC specially since it just gives a non-fatal `unrecognized option'
dnl if not built to support GNU ld.

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dnl For a long time, -znocombreloc was added to LDFLAGS rather than
dnl LD_SWITCH_SYSTEM_TEMACS.  That is:
dnl * inappropriate, as LDFLAGS is a user option but this is essential.
dnl   Eg "make LDFLAGS=... all" could run into problems,
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dnl   http://bugs.debian.org/684788
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dnl * unnecessary, since temacs is the only thing that actually needs it.
dnl   Indeed this is where it was originally, prior to:
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dnl   http://lists.gnu.org/archive/html/emacs-pretest-bug/2004-03/msg00170.html
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late_LDFLAGS="$LDFLAGS"
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if test x$GCC = xyes; then
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  LDFLAGS_NOCOMBRELOC="-Wl,-znocombreloc"
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else
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  LDFLAGS_NOCOMBRELOC="-znocombreloc"
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fi

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LDFLAGS="$LDFLAGS $LDFLAGS_NOCOMBRELOC"

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AC_MSG_CHECKING([for -znocombreloc])
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  [AC_MSG_RESULT(yes)],
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  LDFLAGS_NOCOMBRELOC=
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  [AC_MSG_RESULT(no)])

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LDFLAGS="$late_LDFLAGS"
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AC_CACHE_CHECK([whether addresses are sanitized],
  [emacs_cv_sanitize_address],
  [AC_COMPILE_IFELSE(
     [AC_LANG_PROGRAM(
	[[#ifndef __has_feature
	  #define __has_feature(f) 0
	  #endif
	  #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
	  #else
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	   error "Addresses are not sanitized.";
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	  #endif
	]])],
     [emacs_cv_sanitize_address=yes],
     [emacs_cv_sanitize_address=no])])

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dnl The function dump-emacs will not be defined and temacs will do
dnl (load "loadup") automatically unless told otherwise.
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test "x$CANNOT_DUMP" = "x" && CANNOT_DUMP=no
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case "$opsys" in
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  your-opsys-here) CANNOT_DUMP=yes ;;
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esac
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if test "$CANNOT_DUMP" = "yes"; then
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  AC_DEFINE(CANNOT_DUMP, 1, [Define if Emacs cannot be dumped on your system.])
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elif test "$emacs_cv_sanitize_address" = yes; then
  AC_MSG_WARN([[Addresses are sanitized; suggest CANNOT_DUMP=yes]])
fi
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AC_SUBST(CANNOT_DUMP)


UNEXEC_OBJ=unexelf.o
case "$opsys" in
  # MSDOS uses unexcoff.o
  aix4-2)
   UNEXEC_OBJ=unexaix.o
   ;;
  cygwin)
   UNEXEC_OBJ=unexcw.o
   ;;
  darwin)
   UNEXEC_OBJ=unexmacosx.o
   ;;
  hpux10-20 | hpux11)
   UNEXEC_OBJ=unexhp9k800.o
   ;;
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  mingw32)
   UNEXEC_OBJ=unexw32.o
   ;;
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  sol2-10)
   # Use the Solaris dldump() function, called from unexsol.c, to dump
   # emacs, instead of the generic ELF dump code found in unexelf.c.
   # The resulting binary has a complete symbol table, and is better
   # for debugging and other observability tools (debuggers, pstack, etc).
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   #
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   # If you encounter a problem using dldump(), please consider sending
   # a message to the OpenSolaris tools-linking mailing list:
   #      http://mail.opensolaris.org/mailman/listinfo/tools-linking
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   #