configure.ac 193 KB
Newer Older
1
dnl  Autoconf script for GNU Emacs
2 3
dnl To rebuild the 'configure' script from this, execute the command
dnl	autoconf
David J. MacKenzie's avatar
David J. MacKenzie committed
4
dnl in the directory containing this script.
5
dnl If you changed any AC_DEFINES, also run autoheader.
6
dnl
Paul Eggert's avatar
Paul Eggert committed
7
dnl Copyright (C) 1994-1996, 1999-2019 Free Software Foundation, Inc.
8
dnl
9
dnl  This file is part of GNU Emacs.
10
dnl
11
dnl  GNU Emacs is free software: you can redistribute it and/or modify
12
dnl  it under the terms of the GNU General Public License as published by
13 14
dnl  the Free Software Foundation, either version 3 of the License, or
dnl  (at your option) any later version.
15
dnl
16 17 18 19
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.
20
dnl
21
dnl  You should have received a copy of the GNU General Public License
22
dnl  along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
23

24
AC_PREREQ(2.65)
Glenn Morris's avatar
Glenn Morris committed
25
dnl Note this is parsed by (at least) make-dist and lisp/cedet/ede/emacs.el.
26
AC_INIT(GNU Emacs, 27.0.50, bug-gnu-emacs@gnu.org, , https://www.gnu.org/software/emacs/)
27

28 29 30 31 32 33
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=
34 35
dnl This is the documented way to record the args passed to configure,
dnl rather than $ac_configure_args.
Paul Eggert's avatar
Paul Eggert committed
36
for opt in "$@" CFLAGS CPPFLAGS LDFLAGS; do
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
  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=' '
65 66
done

67
AC_CONFIG_HEADERS(src/config.h:src/config.in)
68
AC_CONFIG_SRCDIR(src/lisp.h)
69
AC_CONFIG_AUX_DIR(build-aux)
70
AC_CONFIG_MACRO_DIR(m4)
71 72 73 74

xcsdkdir=
AC_CHECK_PROGS(XCRUN, [xcrun])
if test -n "$XCRUN"; then
75 76
  if test -z "$MAKE"; then
    dnl Call the variable MAKE_PROG, not MAKE, to avoid confusion with
77
    dnl the usual MAKE variable that 'make' itself uses.
78 79 80 81
    AC_CHECK_PROG([MAKE_PROG], [make], [yes])
    if test -z "$MAKE_PROG"; then
      MAKE="$XCRUN MAKE"
      export MAKE
82
      xcsdkdir=`$XCRUN --show-sdk-path 2>/dev/null`
83 84
    fi
  fi
85 86
fi

87
dnl Check for GNU Make and possibly set MAKE.
88 89 90 91 92 93 94 95 96
[emacs_check_gnu_make ()
{
  emacs_makeout=`($1 --version) 2>/dev/null` &&
  case $emacs_makeout in
    'GNU Make '3.8[1-9]* | 'GNU Make '3.9[0-9]* | \
    'GNU Make '3.[1-9][0-9][0-9]* | 'GNU Make '[4-9]* | 'GNU Make '[1-9][0-9]* )
       ac_path_MAKE_found=:;;
  esac
}]
97 98 99
AC_CACHE_CHECK([for GNU Make], [ac_cv_path_MAKE],
  [ac_path_MAKE_found=false
   if test -n "$MAKE"; then
100
     emacs_check_gnu_make "$MAKE"
101 102 103 104 105 106
     ac_cv_path_MAKE=$MAKE
   else
     emacs_tried_make=false
     emacs_tried_gmake=false
     emacs_tried_gnumake=false
     AC_PATH_PROGS_FEATURE_CHECK([MAKE], [make gmake gnumake],
107 108 109 110 111 112 113 114 115 116
       [[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
117 118
	 eval emacs_tried_$ac_prog=:]])
   fi])
119 120
$ac_path_MAKE_found || {
AC_MSG_ERROR([[Building Emacs requires GNU Make, at least version 3.81.
121 122 123 124
If you have it installed under another name, configure with 'MAKE=...'.
For example, run '$0 MAKE=gnu-make'.]])
}
MAKE=$ac_cv_path_MAKE
125
export MAKE
126

127 128 129
dnl Canonicalize the configuration name.
AC_CANONICAL_HOST

130
case $host in
131 132
 *-mingw*)

133 134 135 136 137 138 139 140 141
  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.

142
      AC_MSG_CHECKING([the compiler's target])
143
      if test -z "$CC"; then
144 145 146 147
	  cc=gcc
      else
	  cc=$CC
      fi
148 149 150
      cc_target=`$cc -v 2>&1 | sed -n 's/Target: //p'`
      case "$cc_target" in
          *-*) host=$cc_target
151 152
	      ;;
          "") AC_MSG_ERROR([Impossible to obtain $cc compiler target.
153
Please explicitly provide --host.])
154 155
              ;;
	  *) AC_MSG_WARN([Compiler reported non-standard target.
156
Defaulting to $host.])
157 158
              ;;
      esac
159
      AC_MSG_RESULT([$host])
160 161
  fi

162 163 164 165 166 167 168 169
  . $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`
170
      # 'eval' pacifies strict POSIX non-MinGW shells (Bug#18612).
171 172
      # We downcase the drive letter to avoid warnings when
      # generating autoloads.
173
      eval 'srcdir=/`echo ${srcdir:0:1} | sed "y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/"`"${srcdir:2}"'
174 175 176 177
      ;;
  esac;;
esac

178 179
canonical=$host
configuration=${host_alias-${build_alias-$host}}
180
emacs_uname_r=`uname -r`
181

182 183 184 185
dnl Support for --program-prefix, --program-suffix and
dnl --program-transform-name options
AC_ARG_PROGRAM

186 187 188 189
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.
David J. MacKenzie's avatar
David J. MacKenzie committed
190
lispdir='${datadir}/emacs/${version}/lisp'
191
standardlisppath='${lispdir}'
192
locallisppath='${datadir}/emacs/${version}/site-lisp:'\
193
'${datadir}/emacs/site-lisp'
194
lisppath='${locallisppath}:${standardlisppath}'
David J. MacKenzie's avatar
David J. MacKenzie committed
195
etcdir='${datadir}/emacs/${version}/etc'
196
archlibdir='${libexecdir}/emacs/${version}/${configuration}'
197
etcdocdir='${datadir}/emacs/${version}/etc'
198
gamedir='${localstatedir}/games/emacs'
199

200 201 202
dnl Special option to disable the most of other options.
AC_ARG_WITH(all,
[AS_HELP_STRING([--without-all],
203 204
		[omit almost all features and build
		small executable with minimal dependencies])],
205
  [with_features=$withval],
206
  [with_features=yes])
207

208 209 210 211 212 213 214 215 216 217 218 219
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
220
])dnl
221 222

dnl OPTION_DEFAULT_ON(NAME, HELP-STRING)
Michael Albinus's avatar
Michael Albinus committed
223
dnl Create a new --with option that defaults to $with_features.
224
dnl NAME is the base name of the option.  The shell variable with_NAME
225 226 227 228 229 230 231
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
232
   m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=$with_features])dnl
233 234
])dnl

235 236 237
# For retrieving mail, unencrypted network connections are the default
# only on native MS-Windows platforms.  (FIXME: These platforms should
# also be secure by default.)
238

239 240 241 242 243 244 245 246 247 248
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])
249 250 251 252 253
if test "$with_mailutils" = no; then
  with_mailutils=
fi
AC_SUBST([with_mailutils])

254 255 256 257 258 259 260 261
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 $host in
     *-mingw*) with_pop=yes;;
262
     *) with_pop=no-by-default;;
263
   esac])
264
if test "$with_pop" = yes; then
Dave Love's avatar
Dave Love committed
265
   AC_DEFINE(MAIL_USE_POP)
266
fi
267
AH_TEMPLATE(MAIL_USE_POP, [Define to support POP mail retrieval.])dnl
268

269
OPTION_DEFAULT_OFF([kerberos],[support Kerberos-authenticated POP])
270
if test "$with_kerberos" != no; then
271
   AC_DEFINE(KERBEROS)
272
fi
273 274
AH_TEMPLATE(KERBEROS,
	    [Define to support Kerberos-authenticated POP mail retrieval.])dnl
275

276
OPTION_DEFAULT_OFF([kerberos5],[support Kerberos version 5 authenticated POP])
277 278
if test "${with_kerberos5}" != no; then
  if test "${with_kerberos}" = no; then
279 280 281
    with_kerberos=yes
    AC_DEFINE(KERBEROS)
  fi
282
  AC_DEFINE(KERBEROS5, 1, [Define to use Kerberos 5 instead of Kerberos 4.])
283
fi
284

285
OPTION_DEFAULT_OFF([hesiod],[support Hesiod to get the POP server host])
286 287
dnl FIXME hesiod support may not be present, so it seems like an error
dnl to define, or at least use, this unconditionally.
288
if test "$with_hesiod" != no; then
289
  AC_DEFINE(HESIOD, 1, [Define to support using a Hesiod database to find the POP server.])
290
fi
Pavel Janík's avatar
Pavel Janík committed
291

292 293 294 295 296 297 298 299 300
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.]))

301
AC_ARG_WITH([sound],[AS_HELP_STRING([--with-sound=VALUE],
Joakim Verona's avatar
Joakim Verona committed
302
  [compile with sound support (VALUE one of: yes, alsa, oss, bsd-ossaudio, no;
303
default yes).  Only for GNU/Linux, FreeBSD, NetBSD, MinGW, Cygwin.])],
304
  [ case "${withval}" in
Joakim Verona's avatar
Joakim Verona committed
305
      yes|no|alsa|oss|bsd-ossaudio) val=$withval ;;
306 307
      *) AC_MSG_ERROR(['--with-sound=$withval' is invalid;
this option's value should be 'yes', 'no', 'alsa', 'oss', or 'bsd-ossaudio'.])
308 309 310 311 312
      ;;
    esac
    with_sound=$val
  ],
  [with_sound=$with_features])
Pavel Janík's avatar
Pavel Janík committed
313

Daniel Colascione's avatar
Daniel Colascione committed
314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381
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
382 383 384 385
  AC_DEFINE([HAVE_PDUMPER], 1, [Define to build with portable dumper support])
  HAVE_PDUMPER=yes
else
  HAVE_PDUMPER=no
Daniel Colascione's avatar
Daniel Colascione committed
386
fi
387
AC_SUBST([HAVE_PDUMPER])
Daniel Colascione's avatar
Daniel Colascione committed
388 389 390 391

DUMPING=$with_dumping
AC_SUBST(DUMPING)

392
dnl FIXME currently it is not the last.
393
dnl This should be the last --with option, because --with-x is
394
dnl added later on when we find the file name of X, and it's best to
395
dnl keep them together visually.
396
AC_ARG_WITH([x-toolkit],[AS_HELP_STRING([--with-x-toolkit=KIT],
397
 [use an X toolkit (KIT one of: yes or gtk, gtk2, gtk3, lucid or athena, motif, no)])],
David J. MacKenzie's avatar
David J. MacKenzie committed
398
[	  case "${withval}" in
Glenn Morris's avatar
Glenn Morris committed
399
	    y | ye | yes )	val=gtk ;;
David J. MacKenzie's avatar
David J. MacKenzie committed
400 401
	    n | no )		val=no  ;;
	    l | lu | luc | luci | lucid )	val=lucid ;;
402
	    a | at | ath | athe | athen | athena )	val=athena ;;
403
	    m | mo | mot | moti | motif )	val=motif ;;
Jan Djärv's avatar
Jan Djärv committed
404
	    g | gt | gtk  )	val=gtk ;;
405
	    gtk2  )	val=gtk2 ;;
406
	    gtk3  )	val=gtk3 ;;
David J. MacKenzie's avatar
David J. MacKenzie committed
407
	    * )
408 409 410 411
AC_MSG_ERROR(['--with-x-toolkit=$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.])
David J. MacKenzie's avatar
David J. MacKenzie committed
412 413 414 415
	    ;;
	  esac
	  with_x_toolkit=$val
])
416

417
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])
Paul Eggert's avatar
Paul Eggert committed
418 419 420 421
if test "$with_wide_int" = yes; then
  AC_DEFINE([WIDE_EMACS_INT], 1, [Use long long for EMACS_INT if available.])
fi

422 423
dnl _ON results in a '--without' option in the --help output, so
dnl the help text should refer to "don't compile", etc.
Paul Eggert's avatar
Paul Eggert committed
424
with_xpm_set=${with_xpm+set}
425 426 427 428 429 430
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])
431
OPTION_DEFAULT_ON([lcms2],[don't compile with Little CMS support])
432
OPTION_DEFAULT_ON([libsystemd],[don't compile with libsystemd support])
433
OPTION_DEFAULT_OFF([cairo],[compile with Cairo drawing (experimental)])
434
OPTION_DEFAULT_ON([xml2],[don't compile with XML parsing support])
435
OPTION_DEFAULT_OFF([imagemagick],[compile with ImageMagick image support])
436
OPTION_DEFAULT_ON([json], [don't compile with native JSON support])
437

438
OPTION_DEFAULT_ON([xft],[don't use XFT for anti aliased fonts])
Miles Bader's avatar
Miles Bader committed
439 440 441
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])

442
OPTION_DEFAULT_ON([toolkit-scroll-bars],[don't use Motif/Xaw3d/GTK toolkit scroll bars])
443
OPTION_DEFAULT_ON([xaw3d],[don't use Xaw3d])
444
OPTION_DEFAULT_ON([xim],[at runtime, default X11 XIM to off])
445
AC_ARG_WITH([ns],[AS_HELP_STRING([--with-ns],
446 447
[use Nextstep (macOS Cocoa or GNUstep) windowing system.
On by default on macOS.])],[],[with_ns=maybe])
448
OPTION_DEFAULT_OFF([w32], [use native MS Windows GUI in a Cygwin build])
449 450

OPTION_DEFAULT_ON([gpm],[don't use -lgpm for mouse support on a GNU/Linux console])
451
OPTION_DEFAULT_ON([dbus],[don't compile with D-Bus support])
452
AC_ARG_WITH([gconf],[AS_HELP_STRING([--with-gconf],
453 454 455 456 457 458
[compile with Gconf support (Gsettings replaces this)])],[],
[if test $with_features = yes; then
with_gconf=maybe
else
with_gconf=no
fi])
459
OPTION_DEFAULT_ON([gsettings],[don't compile with GSettings support])
Karel Klíc's avatar
Karel Klíc committed
460
OPTION_DEFAULT_ON([selinux],[don't compile with SELinux support])
Ted Zlatanov's avatar
Ted Zlatanov committed
461
OPTION_DEFAULT_ON([gnutls],[don't use -lgnutls for SSL/TLS support])
462
OPTION_DEFAULT_ON([zlib],[don't compile with zlib decompression support])
463
OPTION_DEFAULT_OFF([modules],[compile with dynamic modules support])
464
OPTION_DEFAULT_ON([threads],[don't compile with elisp threading support])
465 466

AC_ARG_WITH([file-notification],[AS_HELP_STRING([--with-file-notification=LIB],
Michael Albinus's avatar
Michael Albinus committed
467
 [use a file notification library (LIB one of: yes, inotify, kqueue, gfile, w32, no)])],
468 469 470 471
 [ case "${withval}" in
    y | ye | yes )	val=yes ;;
    n | no )		val=no  ;;
    i | in | ino | inot | inoti | inotif | inotify )	val=inotify ;;
Michael Albinus's avatar
Michael Albinus committed
472 473
    k | kq | kqu | kque | kqueu | kqueue )	val=kqueue ;;
    g | gf | gfi | gfil | gfile )	val=gfile ;;
474
    w | w3 | w32 )	val=w32 ;;
475
    * ) AC_MSG_ERROR(['--with-file-notification=$withval' is invalid;
Paul Eggert's avatar
Paul Eggert committed
476
this option's value should be 'yes', 'no', 'inotify', 'kqueue', 'gfile' or 'w32'.
477
'yes' is a synonym for 'w32' on MS-Windows, for 'no' on Nextstep,
Michael Albinus's avatar
Michael Albinus committed
478
otherwise for the first of 'inotify', 'kqueue' or 'gfile' that is usable.])
479 480 481 482
    ;;
   esac
   with_file_notification=$val
 ],
483
 [with_file_notification=$with_features])
484

485
OPTION_DEFAULT_OFF([xwidgets],
486
  [enable use of some gtk widgets in Emacs buffers (requires gtk3)])
487

488 489
## For the times when you want to build Emacs but don't have
## a suitable makeinfo, and can live without the manuals.
490
dnl https://lists.gnu.org/r/emacs-devel/2008-04/msg01844.html
491 492
OPTION_DEFAULT_ON([makeinfo],[don't require makeinfo for building manuals])

493 494 495
## Makefile.in needs the cache file name.
AC_SUBST(cache_file)

496 497
## This is an option because I do not know if all info/man support
## compressed files, nor how to test if they do so.
Joakim Verona's avatar
Joakim Verona committed
498 499 500
OPTION_DEFAULT_ON([compress-install],
  [don't compress some files (.el, .info, etc.) when installing.  Equivalent to:
make GZIP_PROG= install])
501

502
AC_ARG_WITH(gameuser,dnl
503 504 505 506 507 508
[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 ${with_gameuser} in
509 510
  '' | no) ;;
  yes) gamegroup=games ;;
511
  :*) gamegroup=${with_gameuser#:} ;;
512 513
  *) gameuser=${with_gameuser} ;;
esac
514

515
AC_ARG_WITH([gnustep-conf],dnl
516
[AS_HELP_STRING([--with-gnustep-conf=FILENAME],
517 518 519
   [name of GNUstep configuration file to use on systems where the command
    'gnustep-config' does not work; default $GNUSTEP_CONFIG_FILE, or
    /etc/GNUstep/GNUstep.conf])])
520 521 522 523 524
test "X${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

525
AC_ARG_ENABLE(ns-self-contained,
526 527 528
[AS_HELP_STRING([--disable-ns-self-contained],
                [disable self contained build under NeXTstep])],
   EN_NS_SELF_CONTAINED=$enableval,
529 530
   EN_NS_SELF_CONTAINED=yes)

Jan D's avatar
Jan D committed
531
locallisppathset=no
Lute Kamstra's avatar
Lute Kamstra committed
532
AC_ARG_ENABLE(locallisppath,
533 534 535
[AS_HELP_STRING([--enable-locallisppath=PATH],
                [directories Emacs should search for lisp files specific
		 to this site])],
Lute Kamstra's avatar
Lute Kamstra committed
536 537 538
if test "${enableval}" = "no"; then
  locallisppath=
elif test "${enableval}" != "yes"; then
Jan D's avatar
Jan D committed
539
  locallisppath=${enableval} locallisppathset=yes
Lute Kamstra's avatar
Lute Kamstra committed
540 541
fi)

542
AC_ARG_ENABLE(checking,
543
[AS_HELP_STRING([--enable-checking@<:@=LIST@:>@],
Paul Eggert's avatar
Paul Eggert committed
544
		[enable expensive checks.  With LIST,
545 546 547
		 enable only specific categories of checks.
		 Categories are: all,yes,no.
		 Flags are: stringbytes, stringoverrun, stringfreelist,
548
		 structs, glyphs])],
549 550
[ac_checking_flags="${enableval}"],[])
IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS="$IFS,"
Paul Eggert's avatar
Paul Eggert committed
551
CHECK_STRUCTS=false
552 553 554 555 556 557
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= ;
Paul Eggert's avatar
Paul Eggert committed
558
			CHECK_STRUCTS=false
559 560 561
			ac_gc_check_stringbytes= ;
	                ac_gc_check_string_overrun= ;
	                ac_gc_check_string_free_list= ;
562
			ac_glyphs_debug= ;;
563
	all)		ac_enable_checking=1 ;
Paul Eggert's avatar
Paul Eggert committed
564
			CHECK_STRUCTS=true
565 566 567
			ac_gc_check_stringbytes=1 ;
	                ac_gc_check_string_overrun=1 ;
	                ac_gc_check_string_free_list=1 ;
568
			ac_glyphs_debug=1 ;;
569
	# these enable particular checks
570 571
	stringbytes)	ac_gc_check_stringbytes=1 ;;
	stringoverrun)	ac_gc_check_string_overrun=1 ;;
572
	stringfreelist) ac_gc_check_string_free_list=1 ;;
Paul Eggert's avatar
Paul Eggert committed
573
	structs)	CHECK_STRUCTS=true ;;
574
	glyphs)		ac_glyphs_debug=1 ;;
575 576 577 578 579 580 581
	*)	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,
582
[Define to 1 if expensive run-time data type and consistency checks are enabled.])
583
fi
Paul Eggert's avatar
Paul Eggert committed
584 585 586 587 588 589 590 591 592
if $CHECK_STRUCTS; then
  AC_DEFINE([CHECK_STRUCTS], 1,
    [Define this to check whether someone updated the portable dumper
     code after changing the layout of a structure that it uses.
     If you change one of these structures, check that the pdumper.c
     code is still valid, and update the pertinent hash in pdumper.c
     by manually copying the hash from the newly-generated dmpstruct.h.])
fi
AC_SUBST([CHECK_STRUCTS])
593 594 595 596 597 598
if test x$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
599
if test x$ac_gc_check_string_overrun != x ; then
600 601 602 603 604 605 606
  AC_DEFINE(GC_CHECK_STRING_OVERRUN, 1,
[Define this to check for short string overrun.])
fi
if test x$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
607
if test x$ac_glyphs_debug != x ; then
608 609 610
  AC_DEFINE(GLYPH_DEBUG, 1,
[Define this to enable glyphs debugging code.])
fi
611

612 613 614
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.
615
dnl https://lists.gnu.org/r/emacs-devel/2012-11/msg00393.html
616
AC_ARG_ENABLE(profiling,
617
[AS_HELP_STRING([--enable-profiling],
618 619 620
		[build emacs with low-level, gprof profiling support.
                Mainly useful for debugging Emacs itself.  May not work on
                all platforms.  Stops profiler.el working.])],
621 622 623 624 625 626
[ac_enable_profiling="${enableval}"],[])
if test x$ac_enable_profiling != x ; then
   PROFILING_CFLAGS="-DPROFILING=1 -pg"
else
   PROFILING_CFLAGS=
fi
627
AC_SUBST(PROFILING_CFLAGS)
628

629 630 631
AC_ARG_ENABLE(autodepend,
[AS_HELP_STRING([--enable-autodepend],
		[automatically generate dependencies to .h-files.
632
		 Requires gcc, enabled if found.])],
633 634
[ac_enable_autodepend="${enableval}"],[ac_enable_autodepend=yes])

635 636 637 638 639
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}"],[])

640 641 642 643 644 645 646
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])
647

648
dnl This used to use changequote, but, apart from 'changequote is evil'
Dave Love's avatar
Dave Love committed
649 650 651
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.
652 653 654 655
dnl
dnl Since Emacs can't find matching pairs of quotes, boundaries are
dnl indicated by comments.
dnl quotation begins
Dave Love's avatar
Dave Love committed
656
[
David J. MacKenzie's avatar
David J. MacKenzie committed
657 658 659

### If you add support for a new configuration, add code to this
### switch statement to recognize your configuration name and select
660 661
### the appropriate opsys.

David J. MacKenzie's avatar
David J. MacKenzie committed
662 663 664 665 666 667
### 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.

Paul Eggert's avatar
Paul Eggert committed
668
opsys='' unported=no
David J. MacKenzie's avatar
David J. MacKenzie committed
669 670
case "${canonical}" in

671 672
  ## GNU/Linux and similar ports
  *-*-linux* )
673 674 675
    opsys=gnu-linux
  ;;

676
  ## FreeBSD ports
677
  *-*-freebsd* )
678 679 680
    opsys=freebsd
  ;;

681 682 683 684 685
  ## DragonFly ports
  *-*-dragonfly* )
    opsys=dragonfly
  ;;

686 687 688 689 690
  ## FreeBSD kernel + glibc based userland
  *-*-kfreebsd*gnu* )
    opsys=gnu-kfreebsd
  ;;

David J. MacKenzie's avatar
David J. MacKenzie committed
691 692 693 694 695
  ## NetBSD ports
  *-*-netbsd* )
    opsys=netbsd
  ;;

696
  ## OpenBSD ports
697
  *-*-openbsd* | *-*-mirbsd* )
698 699 700
    opsys=openbsd
  ;;

701
  ## Apple Darwin / macOS
702 703
  *-apple-darwin* )
    case "${canonical}" in
704
      *-apple-darwin[0-9].*) unported=yes ;;
705
      i[3456]86-* | x86_64-* )  ;;
706 707 708
      * )            unported=yes ;;
    esac
    opsys=darwin
Paul Eggert's avatar
Paul Eggert committed
709
    ## FIXME: Find a way to use Fink if available (Bug#11507).
710 711
  ;;

712 713 714 715 716
  ## Chromium Native Client
  *-nacl )
    opsys=nacl
  ;;

717 718 719 720 721
  ## Cygwin ports
  *-*-cygwin )
    opsys=cygwin
  ;;

722 723
  ## HP 9000 series 700 and 800, running HP/UX
  hppa*-hp-hpux10.2* )
724
    opsys=hpux10-20
725 726
  ;;
  hppa*-hp-hpux1[1-9]* )
727
    opsys=hpux11
728 729 730
    CFLAGS="-D_INCLUDE__STDC_A1_SOURCE $CFLAGS"
  ;;

David J. MacKenzie's avatar
David J. MacKenzie committed
731
  ## IBM machines
732
  rs6000-ibm-aix4.[23]* )
Paul Eggert's avatar
Paul Eggert committed
733
    opsys=aix4-2
734
  ;;
735
  powerpc-ibm-aix4.[23]*  )
Paul Eggert's avatar
Paul Eggert committed
736
    opsys=aix4-2
737
  ;;
738
  rs6000-ibm-aix[56]* )
Paul Eggert's avatar
Paul Eggert committed
739
    opsys=aix4-2
Eli Zaretskii's avatar
Eli Zaretskii committed
740
  ;;
Paul Eggert's avatar
Paul Eggert committed
741
  powerpc-ibm-aix[5-9]* | powerpc-ibm-aix[1-9][0-9]* )
Paul Eggert's avatar
Paul Eggert committed
742
    opsys=aix4-2
743
  ;;
David J. MacKenzie's avatar
David J. MacKenzie committed
744 745

  ## Suns
746
  *-sun-solaris* \
Dan Nicolaescu's avatar
Dan Nicolaescu committed
747
    | i[3456]86-*-solaris2* | i[3456]86-*-sunos5* \
748
    | x86_64-*-solaris2*    | x86_64-*-sunos5*)
David J. MacKenzie's avatar
David J. MacKenzie committed
749
    case "${canonical}" in
Paul Eggert's avatar
Paul Eggert committed
750 751 752
      i[3456]86-*-* )   ;;
      amd64-*-*|x86_64-*-*) ;;
      sparc* )		;;
David J. MacKenzie's avatar
David J. MacKenzie committed
753 754 755
      * )		unported=yes ;;
    esac
    case "${canonical}" in
756 757 758 759
      *-sunos5.[1-9][0-9]* | *-solaris2.[1-9][0-9]* )
		opsys=sol2-10
		emacs_check_sunpro_c=yes
		;;
760 761
      *-sunos5.[1-5]* | *-solaris2.[1-5]* ) unported=yes ;;
      ## Note that Emacs 23.1's NEWS said the following would be dropped.
762 763 764 765
      *-sunos5.6* | *-solaris2.6* )
		opsys=sol2-6
		RANLIB="ar -ts"
		;;
766
      ## 5.7 EOL Aug 2008, 5.8 EOL Mar 2012.
767
      *-sunos5.[7-9]* | *-solaris2.[7-9]* )
768
		opsys=sol2-6
769
		emacs_check_sunpro_c=yes
Dan Nicolaescu's avatar
Dan Nicolaescu committed
770
		;;
David J. MacKenzie's avatar
David J. MacKenzie committed
771
    esac
772 773 774 775 776 777 778 779 780 781 782
    ## 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
David J. MacKenzie's avatar
David J. MacKenzie committed
783 784
  ;;

Paul Eggert's avatar
Paul Eggert committed
785 786 787
  ## QNX Neutrino
  *-nto-qnx* )
    opsys=qnxnto
Paul Eggert's avatar
Paul Eggert committed
788
    test -z "$CC" && CC=qcc
Paul Eggert's avatar
Paul Eggert committed
789
    CFLAGS="$CFLAGS -D__NO_EXT_QNX"
790 791 792
    if test "$with_unexec" = yes; then
      LDFLAGS="-N2MB $LDFLAGS"
    fi
Paul Eggert's avatar
Paul Eggert committed
793 794
  ;;

795
  ## Intel 386 machines where we don't care about the manufacturer.
796
  i[3456]86-*-* )
David J. MacKenzie's avatar
David J. MacKenzie committed
797
    case "${canonical}" in
798
      *-darwin* )               opsys=darwin ;;
799
      *-mingw* )
800
		opsys=mingw32
801
		# MinGW overrides and adds some system headers in nt/inc.
802
		GCC_TEST_OPTIONS="-I $srcdir/nt/inc"
803
		;;
804 805 806
      *-sysv4.2uw* )		opsys=unixware ;;
      *-sysv5uw* )		opsys=unixware ;;
      *-sysv5OpenUNIX* )	opsys=unixware ;;
David J. MacKenzie's avatar
David J. MacKenzie committed
807 808 809 810
      ## Otherwise, we'll fall through to the generic opsys code at the bottom.
    esac
  ;;

811 812 813
  # MinGW64
  x86_64-*-* )
    case "${canonical}" in
814
      *-mingw* )
815 816 817 818 819 820 821 822
		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
  ;;

David J. MacKenzie's avatar
David J. MacKenzie committed
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
  * )
    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

Dave Love's avatar
Dave Love committed
843
]
844
dnl quotation ends
David J. MacKenzie's avatar
David J. MacKenzie committed
845 846

if test $unported = yes; then
847
  AC_MSG_ERROR([Emacs does not support '${canonical}' systems.
Glenn Morris's avatar
Glenn Morris committed
848
If you think it should, please send a report to ${PACKAGE_BUGREPORT}.
849
Check 'etc/MACHINES' for recognized configuration names.])
David J. MacKenzie's avatar
David J. MacKenzie committed
850 851 852
fi

#### Choose a compiler.
853

Paul Eggert's avatar
Paul Eggert committed
854 855 856
dnl Don't bother to test for C89.
AC_DEFUN([_AC_PROG_CC_C89], [$2])

857
dnl Sets GCC=yes if using gcc.
858
AC_PROG_CC([gcc cc cl clang "$XCRUN gcc" "$XCRUN clang"])
859
if test -n "$XCRUN"; then
860
  AC_CHECK_PROGS(AR, [ar "$XCRUN ar"])
861
  test -n "$AR" && export AR
862
fi
863

Paul Eggert's avatar
Paul Eggert committed
864 865 866
dnl Emacs needs C99 or later.
gl_PROG_CC_C99

867
AC_PROG_CC_C_O
Paul Eggert's avatar
Paul Eggert committed
868

869 870
if test x$GCC = xyes; then
  test "x$GCC_TEST_OPTIONS" != x && CC="$CC $GCC_TEST_OPTIONS"
871
fi
David J. MacKenzie's avatar
David J. MacKenzie committed
872

873 874
# Avoid gnulib's tests for -lcrypto, so that there's no static dependency on it.
AC_DEFUN([gl_CRYPTO_CHECK])
875 876
# Avoid gnulib's tests for HAVE_WORKING_O_NOATIME and HAVE_WORKING_O_NOFOLLOW,
# as we don't use them.
877
AC_DEFUN([gl_FCNTL_O_FLAGS])
878 879 880 881 882 883
# 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
Paul Eggert's avatar
Paul Eggert committed
884 885 886 887 888
# 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])
889 890 891 892
# 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])])
893

894
# Initialize gnulib right after choosing the compiler.
Glenn Morris's avatar
Glenn Morris committed
895
dnl Amongst other things, this sets AR and ARFLAGS.
896
gl_EARLY
897

898
if test "$ac_test_CFLAGS" != set; then
Paul Eggert's avatar
Paul Eggert committed
899 900 901
  # 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.
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
  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],
Paul Eggert's avatar
Paul Eggert committed
917 918
	 [emacs_cv_prog_cc_g3=no])])
    if test $emacs_cv_prog_cc_g3 != yes; then
919 920
      CFLAGS=$emacs_save_CFLAGS
    fi
921 922 923
    if test $opsys = mingw32; then
      CFLAGS="$CFLAGS -gdwarf-2"
    fi
924
  fi
Paul Eggert's avatar
Paul Eggert committed
925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942

  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
943 944
fi

945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
# 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])
  ]
)

963
AC_ARG_ENABLE([gcc-warnings],
964 965 966 967 968 969
  [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).])],
970
  [case $enableval in
971
     yes|no|warn-only) ;;
972 973 974
     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
   esac
   gl_gcc_warnings=$enableval],
975 976
  [# 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
977
   # if GCC is recent enough and there is a .git directory or file;
978
   # however, if there is also a .tarball-version file it is probably
Paul Eggert's avatar
Paul Eggert committed
979
   # just a release imported into Git for patch management.
980
   gl_gcc_warnings=no
981
   if test -e "$srcdir"/.git && test ! -f "$srcdir"/.tarball-version; then
982 983 984 985 986
     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],
987 988 989
     [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
990 991 992
  AC_DEFINE([CHECK_LISP_OBJECT_TYPE], 1,
    [Define to enable compile-time checks for the Lisp_Object data type.])
fi
993

994 995 996 997 998
# 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__
Paul Eggert's avatar
Paul Eggert committed
999
	    error "not clang";
1000 1001 1002 1003
	  #endif
        ]])],
     [emacs_cv_clang=yes],
     [emacs_cv_clang=no])])
1004

1005
WERROR_CFLAGS=
1006 1007
# When compiling with GCC, prefer -isystem to -I when including system
# include files, to avoid generating useless diagnostics for the files.
1008
AS_IF([test $gl_gcc_warnings = no],
Paul Eggert's avatar
Paul Eggert committed
1009
 [
1010
  isystem='-I'
Paul Eggert's avatar
Paul Eggert committed
1011 1012
  AS_IF([test "$emacs_cv_clang" = yes],
   [
1013 1014 1015
     # Turn off some warnings if supported.
     gl_WARN_ADD([-Wno-switch])
     gl_WARN_ADD([-Wno-pointer-sign])
1016
     gl_WARN_ADD([-Wno-string-plus-int])
Paul Eggert's avatar
Paul Eggert committed
1017
     gl_WARN_ADD([-Wno-unknown-attributes])
Paul Eggert's avatar
Paul Eggert committed
1018 1019
   ])
 ],[
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
  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
1031
  AS_IF([test $gl_gcc_warnings = yes],
1032
    [WERROR_CFLAGS=-Werror])
1033

1034
  nw="$nw -Wcast-align -Wcast-align=strict" # Emacs is tricky with pointers.
1035 1036
  nw="$nw -Wduplicated-branches"    # Too many false alarms
  nw="$nw -Wformat-overflow=2"      # False alarms due to GCC bug 80776
1037 1038
  nw="$nw -Wsystem-headers"         # Don't let system headers trigger warnings
  nw="$nw -Woverlength-strings"     # Not a problem these days
1039
  nw="$nw -Wformat-nonliteral"      # we do this a lot
Paul Eggert's avatar
Paul Eggert committed
1040
  nw="$nw -Wvla"                    # Emacs uses <vla.h>.
1041
  nw="$nw -Wunused-const-variable=2" # lisp.h declares const objects.
1042
  nw="$nw -Winline"                 # OK to ignore 'inline'
1043 1044
  nw="$nw -Wstrict-overflow"        # OK to optimize assuming that
                                    # signed overflow has undefined behavior
1045 1046
  nw="$nw -Wsync-nand"              # irrelevant here, and provokes ObjC warning
  nw="$nw -Wunsafe-loop-optimizations" # OK to suppress unsafe optimizations
1047
  nw="$nw -Wbad-function-cast"      # These casts are no worse than others.
1048
  nw="$nw -Wabi"                    # Not useful, perceived as noise
1049 1050

  # Emacs doesn't care about shadowing; see
1051
  # <https://lists.gnu.org/r/emacs-diffs/2011-11/msg00265.html>.
1052 1053
  nw="$nw -Wshadow"

1054 1055 1056
  # Emacs's use of alloca inhibits protecting the stack.
  nw="$nw -Wstack-protector"

1057 1058 1059
  # Emacs's use of __attribute__ ((cold)) causes false alarms with this option.
  nw="$nw -Wsuggest-attribute=cold"

1060 1061 1062 1063
  # Emacs's use of partly-const functions such as Fgnutls_available_p
  # make this option problematic.
  nw="$nw -Wsuggest-attribute=const"

Paul Eggert's avatar
Paul Eggert committed
1064 1065
  # Emacs's use of partly-pure functions such as CHECK_TYPE make this
  # option problematic.
1066 1067
  nw="$nw -Wsuggest-attribute=pure"

1068 1069 1070 1071
  # This part is merely for shortening the command line,
  # since -Wall implies -Wswitch.
  nw="$nw -Wswitch"

Joakim Verona's avatar
Joakim Verona committed
1072 1073 1074
  # This part is merely for shortening the command line,
  # since -Wno-FOO needs to be added below regardless.
  nw="$nw -Wmissing-field-initializers"
Paul Eggert's avatar
Paul Eggert committed
1075
  nw="$nw -Woverride-init"
Joakim Verona's avatar
Joakim Verona committed
1076 1077 1078
  nw="$nw -Wtype-limits"
  nw="$nw -Wunused-parameter"

1079
  if test "$emacs_cv_clang" = yes; then
1080
    nw="$nw -Wcast-align"
1081
    nw="$nw -Wdouble-promotion"
1082
    nw="$nw -Wmissing-braces"
1083 1084
  fi

1085
  # These cause too much noise in the MinGW build
1086 1087
  if test $opsys = mingw32; then
    nw="$nw -Wpointer-sign"
1088
    nw="$nw -Wsuggest-attribute=format"
1089 1090
  fi

1091 1092 1093 1094 1095
  gl_MANYWARN_ALL_GCC([ws])
  gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
  for w in $ws; do
    gl_WARN_ADD([$w])
  done
Paul Eggert's avatar
Paul Eggert committed
1096
  gl_WARN_ADD([-Wredundant-decls])     # Prefer this, as we don't use Bison.
1097
  gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one
Paul Eggert's avatar
Paul Eggert committed
1098
  gl_WARN_ADD([-Wno-override-init])    # More trouble than it is worth
1099 1100 1101 1102
  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])
1103

1104
  # clang is unduly picky about some things.
1105
  if test "$emacs_cv_clang" = yes; then
1106
    gl_WARN_ADD([-Wno-missing-braces])
1107
    gl_WARN_ADD([-Wno-null-pointer-arithmetic])
1108 1109
  fi

1110 1111 1112 1113 1114
  # This causes too much noise in the MinGW build
  if test $opsys = mingw32; then
    gl_WARN_ADD([-Wno-pointer-sign])
  fi

1115
  AC_DEFINE([GCC_LINT], [1], [Define to 1 if --enable-gcc-warnings.])
1116 1117
  AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])
  AH_VERBATIM([GNULIB_PORTCHECK_FORTIFY_SOURCE],
1118 1119
  [/* Enable compile-time and run-time bounds-checking, and some warnings,
      without upsetting glibc 2.15+. */
1120 1121
   #if (defined GNULIB_PORTCHECK && !defined _FORTIFY_SOURCE \
        && defined __OPTIMIZE__ && __OPTIMIZE__)
1122 1123 1124
   # define _FORTIFY_SOURCE 2
   #endif
  ])
1125
 ])
1126

Paul Eggert's avatar
Paul Eggert committed
1127
# clang is picky about these regardless of whether
1128 1129
# --enable-gcc-warnings is specified.
if test "$emacs_cv_clang" = yes; then
Paul Eggert's avatar
Paul Eggert committed
1130
  gl_WARN_ADD([-Wno-initializer-overrides])
1131 1132 1133
  gl_WARN_ADD([-Wno-tautological-compare])
  gl_WARN_ADD([-Wno-tautological-constant-out-of-range-compare])
fi
David J. MacKenzie's avatar
David J. MacKenzie committed
1134

1135 1136 1137 1138 1139 1140 1141
# 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])
1142

1143 1144 1145 1146 1147 1148
edit_cflags="
  s,///*,/,g
  s/^/ /
  s/ -I/ $isystem/g
  s/^ //
"
1149

1150 1151
AC_ARG_ENABLE(link-time-optimization,
[AS_HELP_STRING([--enable-link-time-optimization],
1152
                [build with link-time optimization
1153
		 (experimental; see INSTALL)])],
1154 1155
if test "${enableval}" != "no"; then
   ac_lto_supported=no
1156
   if test "$emacs_cv_clang" = yes; then
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
      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 $LTO"
1185
      if test "$emacs_cv_clang" = yes; then
1186 1187 1188 1189 1190
	 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 $GOLD_PLUGIN"
1191 1192 1193 1194 1195 1196 1197
      else
        dnl The following is needed for GCC 4.9.0.  The GCC 4.9.0 release notes
        dnl suggest that instead of -ffat-lto-objects we should use gcc-ar and
        dnl gcc-ranlib in place of ar and ranlib, but gcc-ar makes /usr/bin/ar
        dnl dump core on Fedora 20, so play it safe for now.
        gl_COMPILER_OPTION_IF([-ffat-lto-objects],
          [CFLAGS="$CFLAGS -ffat-lto-objects"])
1198 1199 1200
      fi
   fi
fi)
1201

1202 1203 1204 1205 1206 1207

dnl Automake replacements.
AC_DEFUN([AM_CONDITIONAL],
  [$2 && $1=1 || $1=
   AC_SUBST([$1])])

1208 1209
dnl Prefer silent make output.  For verbose output, use
dnl 'configure --disable-silent-rules' or 'make V=1' .
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
dnl This code is adapted from Automake.
dnl Although it can be simplified now that GNU Make is assumed,
dnl the simplification hasn't been done yet.
AC_ARG_ENABLE([silent-rules],
  [AS_HELP_STRING(
     [--disable-silent-rules],
     [verbose build output (undo: "make V=0")])])
if test "$enable_silent_rules" = no; then
  AM_DEFAULT_VERBOSITY=1
else
  AM_DEFAULT_VERBOSITY=0
fi
AM_V='$(V)'
AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'