1 dnl The following are from prerelease autoconf 2.14a. When 2.14 is
2 dnl released, we should be able to zap them and just use AC_PREREQ(2.14).
4 % Copyright (C) 2000, 2001 Free Software Foundation, Inc.
6 % This file is part of GNU Emacs.
8 % GNU Emacs is free software; you can redistribute it and/or modify
9 % it under the terms of the GNU General Public License as published by
10 % the Free Software Foundation; either version 2, or (at your option)
13 % GNU Emacs is distributed in the hope that it will be useful,
14 % but WITHOUT ANY WARRANTY; without even the implied warranty of
15 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 % GNU General Public License for more details.
18 % You should have received a copy of the GNU General Public License
19 % along with GNU Emacs; see the file COPYING. If not, write to the
20 % Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 % Boston, MA 02111-1307, USA.
23 ifelse(_AC_VERSION_COMPARE(AC_ACVERSION, [2.14]), -1,
27 # If the C compiler in not in ANSI C mode by default, try to add an
28 # option to output variable @code{CC} to make it so. This macro tries
29 # various options that select ANSI C on some system or another. It
30 # considers the compiler to be in ANSI C mode if it handles function
31 # prototypes correctly.
32 AC_DEFUN(AC_PROG_CC_STDC,
33 [AC_REQUIRE([AC_PROG_CC])dnl
34 AC_BEFORE([$0], [AC_C_INLINE])dnl
35 AC_BEFORE([$0], [AC_C_CONST])dnl
36 dnl Force this before AC_PROG_CPP. Some cpp's, eg on HPUX, require
37 dnl a magic option to avoid problems with ANSI preprocessor commands
39 dnl FIXME: can't do this because then AC_AIX won't work due to a
40 dnl circular dependency.
41 dnl AC_BEFORE([$0], [AC_PROG_CPP])
42 AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C)
43 AC_CACHE_VAL(ac_cv_prog_cc_stdc,
44 [ac_cv_prog_cc_stdc=no
46 # Don't try gcc -ansi; that turns off useful extensions and
47 # breaks some systems' header files.
49 # Ultrix and OSF/1 -std1
50 # HP-UX 10.20 and later -Ae
51 # HP-UX older versions -Aa -D_HPUX_SOURCE
52 # SVR4 -Xc -D__EXTENSIONS__
53 for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
55 CC="$ac_save_CC $ac_arg"
59 #include <sys/types.h>
61 /* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
62 struct buf { int x; };
63 FILE * (*rcsopen) (struct buf *, struct stat *, int);
70 static char *f (char * (*g) (char **, int), char **p, ...)
75 s = g (p, va_arg (v,int));
79 int test (int i, double x);
80 struct s1 {int (*f) (int a);};
81 struct s2 {int (*f) (double a);};
82 int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
85 [return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];],
86 [ac_cv_prog_cc_stdc="$ac_arg"; break])
90 case "x$ac_cv_prog_cc_stdc" in
92 AC_MSG_RESULT([none needed]) ;;
94 AC_MSG_RESULT($ac_cv_prog_cc_stdc)
95 CC="$CC $ac_cv_prog_cc_stdc" ;;
101 AC_DEFUN(AC_FUNC_MKTIME,
102 [AC_REQUIRE([AC_HEADER_TIME])dnl
103 AC_CHECK_HEADERS(sys/time.h unistd.h)
104 AC_CHECK_FUNCS(alarm)
105 AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
107 [/* Test program from Paul Eggert (eggert@twinsun.com)
108 and Tony Leneis (tony@plaza.ds.adp.com). */
109 #if TIME_WITH_SYS_TIME
110 # include <sys/time.h>
114 # include <sys/time.h>
125 # define alarm(X) /* empty */
128 /* Work around redefinition to rpl_putenv by other config tests. */
131 static time_t time_t_max;
133 /* Values we'll use to set the TZ environment variable. */
134 static const char *const tz_strings[] = {
135 (const char *) 0, "TZ=GMT0", "TZ=JST-9",
136 "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
138 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
140 /* Fail if mktime fails to convert a date in the spring-forward gap.
141 Based on a problem report from Andreas Jaeger. */
143 spring_forward_gap ()
145 /* glibc (up to about 1998-10-07) failed this test) */
148 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
149 instead of "TZ=America/Vancouver" in order to detect the bug even
150 on systems that don't support the Olson extension, or don't have the
151 full zoneinfo tables installed. */
152 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
161 if (mktime (&tm) == (time_t)-1)
170 if ((lt = localtime (&now)) && mktime (lt) != now)
172 now = time_t_max - now;
173 if ((lt = localtime (&now)) && mktime (lt) != now)
180 /* Based on code from Ariel Faigon. */
190 if (tm.tm_mon != 2 || tm.tm_mday != 31)
200 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
202 if (now != (time_t) -1)
204 struct tm *lt = localtime (&now);
206 && lt->tm_year == tm.tm_year
207 && lt->tm_mon == tm.tm_mon
208 && lt->tm_mday == tm.tm_mday
209 && lt->tm_hour == tm.tm_hour
210 && lt->tm_min == tm.tm_min
211 && lt->tm_sec == tm.tm_sec
212 && lt->tm_yday == tm.tm_yday
213 && lt->tm_wday == tm.tm_wday
214 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
215 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
226 /* This test makes some buggy mktime implementations loop.
227 Give up after 60 seconds; a mktime slower than that
228 isn't worth using anyway. */
231 for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
234 delta = time_t_max / 997; /* a suitable prime number */
235 for (i = 0; i < N_STRINGS; i++)
238 putenv (tz_strings[i]);
240 for (t = 0; t <= time_t_max - delta; t += delta)
242 mktime_test ((time_t) 60 * 60);
243 mktime_test ((time_t) 60 * 60 * 24);
245 for (j = 1; 0 < j; j *= 2)
247 bigtime_test (j - 1);
250 spring_forward_gap ();
253 ac_cv_func_working_mktime=yes, ac_cv_func_working_mktime=no,
254 ac_cv_func_working_mktime=no)])
255 if test $ac_cv_func_working_mktime = no; then
256 LIBOBJS="$LIBOBJS mktime.${ac_objext}"
263 # Note that, unlike const, #defining volatile to be the empty string can
264 # actually turn a correct program into an incorrect one, since removing
265 # uses of volatile actually grants the compiler permission to perform
266 # optimizations that could break the user's code. So, do not #define
267 # volatile away unless it is really necessary to allow the user's code
268 # to compile cleanly. Benign compiler failures should be tolerated.
269 AC_DEFUN(AC_C_VOLATILE,
270 [AC_REQUIRE([AC_PROG_CC_STDC])dnl
271 AC_CACHE_CHECK([for working volatile], ac_cv_c_volatile,
275 ac_cv_c_volatile=yes, ac_cv_c_volatile=no)])
276 if test $ac_cv_c_volatile = no; then
278 [Define to empty if the keyword `volatile' does not work.
279 Warning: valid code using `volatile' can become incorrect
280 without. Disable with care.])
286 # Check if the C compiler supports prototypes, included if it needs
288 AC_DEFUN(AC_C_PROTOTYPES,
289 [AC_REQUIRE([AC_PROG_CC_STDC])dnl
290 AC_REQUIRE([AC_PROG_CPP])dnl
291 AC_MSG_CHECKING([for function prototypes])
292 if test "$ac_cv_prog_cc_stdc" != no; then
294 AC_DEFINE(PROTOTYPES, 1,
295 [Define if the compiler supports function prototypes.])
301 dnl The following is a bit different from the prerelease autoconf at
302 dnl this time since that requires extra definitions.
304 dnl By default, many hosts won't let programs access large files;
305 dnl one must use special compiler options to get large-file access to work.
306 dnl For more details about this brain damage please see:
307 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
309 dnl Written by Paul Eggert <eggert@twinsun.com>.
311 dnl Internal subroutine of AC_SYS_LARGEFILE.
312 dnl AC_SYS_LARGEFILE_TEST_INCLUDES
313 AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
314 [[#include <sys/types.h>
315 int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];
318 dnl Internal subroutine of AC_SYS_LARGEFILE.
319 dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
320 AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
321 [AC_CACHE_CHECK([for $1 value needed for large files], $3,
326 [AC_TRY_COMPILE([#define $1 $2]
331 if test "[$]$3" != no; then
332 AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
335 AC_DEFUN(AC_SYS_LARGEFILE,
336 [AC_REQUIRE([AC_PROG_CC])
337 AC_ARG_ENABLE(largefile,
338 [ --disable-largefile omit support for large files])
339 if test "$enable_largefile" != no; then
341 AC_CACHE_CHECK([for special C compiler options needed for large files],
342 ac_cv_sys_largefile_CC,
343 [ac_cv_sys_largefile_CC=no
344 if test "$GCC" != yes; then
345 # IRIX 6.2 and later do not support large files by default,
346 # so use the C compiler's -n32 option if that helps.
347 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
350 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
351 ac_cv_sys_largefile_CC=' -n32')
354 if test "$ac_cv_sys_largefile_CC" != no; then
355 CC="$CC$ac_cv_sys_largefile_CC"
358 AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
359 ac_cv_sys_file_offset_bits,
360 [Number of bits in a file offset, on hosts where this is settable.],
361 AC_SYS_LARGEFILE_TEST_INCLUDES)
362 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
363 ac_cv_sys_large_files,
364 [Define for large files, on AIX-style hosts.]
365 AC_SYS_LARGEFILE_TEST_INCLUDES)
369 AC_DEFUN(AC_FUNC_FSEEKO,
370 [AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
371 ac_cv_sys_largefile_source,
372 [Define to make fseeko visible on some hosts (e.g. glibc 2.2).],
373 [#include <stdio.h>], [return !fseeko;])
374 # We used to try defining _XOPEN_SOURCE=500 too, to work around a bug
375 # in glibc 2.1.3, but that breaks too many other things.
376 # If you want fseeko and ftello with glibc, upgrade to a fixed glibc.
378 AC_CACHE_CHECK([for fseeko], ac_cv_func_fseeko,
379 [ac_cv_func_fseeko=no
380 AC_TRY_LINK([#include <stdio.h>],
381 [return fseeko && fseeko (stdin, 0, 0);],
382 [ac_cv_func_fseeko=yes])])
383 if test $ac_cv_func_fseeko != no; then
384 AC_DEFINE(HAVE_FSEEKO, 1,
385 [Define if fseeko (and presumably ftello) exists and is declared.])
388 undefine([AC_FUNC_MMAP])dnl
389 dnl The autoconf 2.13 version loses on OSF, at least,
390 dnl by messing up the declaration of malloc.
391 AC_DEFUN([AC_FUNC_MMAP],
392 [AC_CHECK_HEADERS(stdlib.h unistd.h sys/stat.h)
393 AC_CHECK_FUNCS(getpagesize)
394 AC_CACHE_CHECK(for working mmap, ac_cv_func_mmap_fixed_mapped,
396 [/* Thanks to Mike Haertel and Jim Avera for this test.
397 Here is a matrix of mmap possibilities:
398 mmap private not fixed
399 mmap private fixed at somewhere currently unmapped
400 mmap private fixed at somewhere already mapped
401 mmap shared not fixed
402 mmap shared fixed at somewhere currently unmapped
403 mmap shared fixed at somewhere already mapped
404 For private mappings, we should verify that changes cannot be read()
405 back from the file, nor mmap's back from the file at a different
406 address. (There have been systems where private was not correctly
407 implemented like the infamous i386 svr4.0, and systems where the
408 VM page cache was not coherent with the file system buffer cache
409 like early versions of FreeBSD and possibly contemporary NetBSD.)
410 For shared mappings, we should conversely verify that changes get
411 propogated back to all the places they're supposed to be.
413 Grep wants private fixed already mapped.
414 The main things grep needs to know about mmap are:
415 * does it exist and is it safe to write into the mmap'd area
416 * how to use it (BSD variants) */
417 #include <sys/types.h>
419 #include <sys/mman.h>
421 #if STDC_HEADERS || HAVE_STDLIB_H
430 # include <sys/stat.h>
433 /* This mess was copied from the GNU getpagesize.h. */
434 #if !HAVE_GETPAGESIZE
435 /* Assume that all systems that can run configure have sys/param.h. */
436 # if !HAVE_SYS_PARAM_H
437 # define HAVE_SYS_PARAM_H 1
441 # define getpagesize() sysconf(_SC_PAGESIZE)
442 # else /* no _SC_PAGESIZE */
443 # if HAVE_SYS_PARAM_H
444 # include <sys/param.h>
445 # ifdef EXEC_PAGESIZE
446 # define getpagesize() EXEC_PAGESIZE
447 # else /* no EXEC_PAGESIZE */
449 # define getpagesize() NBPG * CLSIZE
452 # endif /* no CLSIZE */
455 # define getpagesize() NBPC
458 # define getpagesize() PAGESIZE
459 # endif /* PAGESIZE */
460 # endif /* no NBPC */
461 # endif /* no NBPG */
462 # endif /* no EXEC_PAGESIZE */
463 # else /* no HAVE_SYS_PARAM_H */
464 # define getpagesize() 8192 /* punt totally */
465 # endif /* no HAVE_SYS_PARAM_H */
466 # endif /* no _SC_PAGESIZE */
468 #endif /* no HAVE_GETPAGESIZE */
473 char *data, *data2, *data3;
477 pagesize = getpagesize ();
479 /* First, make a file with some known garbage in it. */
480 data = (char *) malloc (pagesize);
483 for (i = 0; i < pagesize; ++i)
484 *(data + i) = rand ();
486 fd = creat ("conftestmmap", 0600);
489 if (write (fd, data, pagesize) != pagesize)
493 /* Next, try to mmap the file at a fixed address which already has
494 something else allocated at it. If we can, also make sure that
495 we see the same garbage. */
496 fd = open ("conftestmmap", O_RDWR);
499 data2 = (char *) malloc (2 * pagesize);
502 data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
503 if (data2 != mmap (data2, pagesize, PROT_READ | PROT_WRITE,
504 MAP_PRIVATE | MAP_FIXED, fd, 0L))
506 for (i = 0; i < pagesize; ++i)
507 if (*(data + i) != *(data2 + i))
510 /* Finally, make sure that changes to the mapped area do not
511 percolate back to the file as seen by read(). (This is a bug on
512 some variants of i386 svr4.0.) */
513 for (i = 0; i < pagesize; ++i)
514 *(data2 + i) = *(data2 + i) + 1;
515 data3 = (char *) malloc (pagesize);
518 if (read (fd, data3, pagesize) != pagesize)
520 for (i = 0; i < pagesize; ++i)
521 if (*(data + i) != *(data3 + i))
524 unlink ("conftestmmap");
526 }], ac_cv_func_mmap_fixed_mapped=yes, ac_cv_func_mmap_fixed_mapped=no,
527 ac_cv_func_mmap_fixed_mapped=no)])
528 if test $ac_cv_func_mmap_fixed_mapped = yes; then
529 AC_DEFINE(HAVE_MMAP, 1,
530 [Define if you have a working `mmap' system call.])