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 ifelse(_AC_VERSION_COMPARE(AC_ACVERSION, [2.14]), -1,
8 # If the C compiler in not in ANSI C mode by default, try to add an
9 # option to output variable @code{CC} to make it so. This macro tries
10 # various options that select ANSI C on some system or another. It
11 # considers the compiler to be in ANSI C mode if it handles function
12 # prototypes correctly.
13 AC_DEFUN(AC_PROG_CC_STDC,
14 [AC_REQUIRE([AC_PROG_CC])dnl
15 AC_BEFORE([$0], [AC_C_INLINE])dnl
16 AC_BEFORE([$0], [AC_C_CONST])dnl
17 dnl Force this before AC_PROG_CPP. Some cpp's, eg on HPUX, require
18 dnl a magic option to avoid problems with ANSI preprocessor commands
20 dnl FIXME: can't do this because then AC_AIX won't work due to a
21 dnl circular dependency.
22 dnl AC_BEFORE([$0], [AC_PROG_CPP])
23 AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C)
24 AC_CACHE_VAL(ac_cv_prog_cc_stdc,
25 [ac_cv_prog_cc_stdc=no
27 # Don't try gcc -ansi; that turns off useful extensions and
28 # breaks some systems' header files.
30 # Ultrix and OSF/1 -std1
31 # HP-UX 10.20 and later -Ae
32 # HP-UX older versions -Aa -D_HPUX_SOURCE
33 # SVR4 -Xc -D__EXTENSIONS__
34 for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
36 CC="$ac_save_CC $ac_arg"
40 #include <sys/types.h>
42 /* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
43 struct buf { int x; };
44 FILE * (*rcsopen) (struct buf *, struct stat *, int);
51 static char *f (char * (*g) (char **, int), char **p, ...)
56 s = g (p, va_arg (v,int));
60 int test (int i, double x);
61 struct s1 {int (*f) (int a);};
62 struct s2 {int (*f) (double a);};
63 int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
66 [return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];],
67 [ac_cv_prog_cc_stdc="$ac_arg"; break])
71 case "x$ac_cv_prog_cc_stdc" in
73 AC_MSG_RESULT([none needed]) ;;
75 AC_MSG_RESULT($ac_cv_prog_cc_stdc)
76 CC="$CC $ac_cv_prog_cc_stdc" ;;
82 AC_DEFUN(AC_FUNC_MKTIME,
83 [AC_REQUIRE([AC_HEADER_TIME])dnl
84 AC_CHECK_HEADERS(sys/time.h unistd.h)
86 AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
88 [/* Test program from Paul Eggert (eggert@twinsun.com)
89 and Tony Leneis (tony@plaza.ds.adp.com). */
90 #if TIME_WITH_SYS_TIME
91 # include <sys/time.h>
95 # include <sys/time.h>
106 # define alarm(X) /* empty */
109 /* Work around redefinition to rpl_putenv by other config tests. */
112 static time_t time_t_max;
114 /* Values we'll use to set the TZ environment variable. */
115 static const char *const tz_strings[] = {
116 (const char *) 0, "TZ=GMT0", "TZ=JST-9",
117 "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
119 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
121 /* Fail if mktime fails to convert a date in the spring-forward gap.
122 Based on a problem report from Andreas Jaeger. */
124 spring_forward_gap ()
126 /* glibc (up to about 1998-10-07) failed this test) */
129 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
130 instead of "TZ=America/Vancouver" in order to detect the bug even
131 on systems that don't support the Olson extension, or don't have the
132 full zoneinfo tables installed. */
133 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
142 if (mktime (&tm) == (time_t)-1)
151 if ((lt = localtime (&now)) && mktime (lt) != now)
153 now = time_t_max - now;
154 if ((lt = localtime (&now)) && mktime (lt) != now)
161 /* Based on code from Ariel Faigon. */
171 if (tm.tm_mon != 2 || tm.tm_mday != 31)
181 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
183 if (now != (time_t) -1)
185 struct tm *lt = localtime (&now);
187 && lt->tm_year == tm.tm_year
188 && lt->tm_mon == tm.tm_mon
189 && lt->tm_mday == tm.tm_mday
190 && lt->tm_hour == tm.tm_hour
191 && lt->tm_min == tm.tm_min
192 && lt->tm_sec == tm.tm_sec
193 && lt->tm_yday == tm.tm_yday
194 && lt->tm_wday == tm.tm_wday
195 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
196 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
207 /* This test makes some buggy mktime implementations loop.
208 Give up after 60 seconds; a mktime slower than that
209 isn't worth using anyway. */
212 for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
215 delta = time_t_max / 997; /* a suitable prime number */
216 for (i = 0; i < N_STRINGS; i++)
219 putenv (tz_strings[i]);
221 for (t = 0; t <= time_t_max - delta; t += delta)
223 mktime_test ((time_t) 60 * 60);
224 mktime_test ((time_t) 60 * 60 * 24);
226 for (j = 1; 0 < j; j *= 2)
228 bigtime_test (j - 1);
231 spring_forward_gap ();
234 ac_cv_func_working_mktime=yes, ac_cv_func_working_mktime=no,
235 ac_cv_func_working_mktime=no)])
236 if test $ac_cv_func_working_mktime = no; then
237 LIBOBJS="$LIBOBJS mktime.${ac_objext}"
244 # Note that, unlike const, #defining volatile to be the empty string can
245 # actually turn a correct program into an incorrect one, since removing
246 # uses of volatile actually grants the compiler permission to perform
247 # optimizations that could break the user's code. So, do not #define
248 # volatile away unless it is really necessary to allow the user's code
249 # to compile cleanly. Benign compiler failures should be tolerated.
250 AC_DEFUN(AC_C_VOLATILE,
251 [AC_REQUIRE([AC_PROG_CC_STDC])dnl
252 AC_CACHE_CHECK([for working volatile], ac_cv_c_volatile,
256 ac_cv_c_volatile=yes, ac_cv_c_volatile=no)])
257 if test $ac_cv_c_volatile = no; then
259 [Define to empty if the keyword `volatile' does not work.
260 Warning: valid code using `volatile' can become incorrect
261 without. Disable with care.])
267 # Check if the C compiler supports prototypes, included if it needs
269 AC_DEFUN(AC_C_PROTOTYPES,
270 [AC_REQUIRE([AC_PROG_CC_STDC])dnl
271 AC_REQUIRE([AC_PROG_CPP])dnl
272 AC_MSG_CHECKING([for function prototypes])
273 if test "$ac_cv_prog_cc_stdc" != no; then
275 AC_DEFINE(PROTOTYPES, 1,
276 [Define if the compiler supports function prototypes.])
282 dnl The following is a bit different from the prerelease autoconf at
283 dnl this time since that requires extra definitions.
285 dnl By default, many hosts won't let programs access large files;
286 dnl one must use special compiler options to get large-file access to work.
287 dnl For more details about this brain damage please see:
288 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
290 dnl Written by Paul Eggert <eggert@twinsun.com>.
292 dnl Internal subroutine of AC_SYS_LARGEFILE.
293 dnl AC_SYS_LARGEFILE_TEST_INCLUDES
294 AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
295 [[#include <sys/types.h>
296 int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];
299 dnl Internal subroutine of AC_SYS_LARGEFILE.
300 dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
301 AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
302 [AC_CACHE_CHECK([for $1 value needed for large files], $3,
307 [AC_TRY_COMPILE([#define $1 $2]
312 if test "[$]$3" != no; then
313 AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
316 AC_DEFUN(AC_SYS_LARGEFILE,
317 [AC_REQUIRE([AC_PROG_CC])
318 AC_ARG_ENABLE(largefile,
319 [ --disable-largefile omit support for large files])
320 if test "$enable_largefile" != no; then
322 AC_CACHE_CHECK([for special C compiler options needed for large files],
323 ac_cv_sys_largefile_CC,
324 [ac_cv_sys_largefile_CC=no
325 if test "$GCC" != yes; then
326 # IRIX 6.2 and later do not support large files by default,
327 # so use the C compiler's -n32 option if that helps.
328 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
331 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
332 ac_cv_sys_largefile_CC=' -n32')
335 if test "$ac_cv_sys_largefile_CC" != no; then
336 CC="$CC$ac_cv_sys_largefile_CC"
339 AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
340 ac_cv_sys_file_offset_bits,
341 [Number of bits in a file offset, on hosts where this is settable.],
342 AC_SYS_LARGEFILE_TEST_INCLUDES)
343 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
344 ac_cv_sys_large_files,
345 [Define for large files, on AIX-style hosts.]
346 AC_SYS_LARGEFILE_TEST_INCLUDES)
350 AC_DEFUN(AC_FUNC_FSEEKO,
351 [AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
352 ac_cv_sys_largefile_source,
353 [Define to make fseeko visible on some hosts (e.g. glibc 2.2).],
354 [#include <stdio.h>], [return !fseeko;])
355 # We used to try defining _XOPEN_SOURCE=500 too, to work around a bug
356 # in glibc 2.1.3, but that breaks too many other things.
357 # If you want fseeko and ftello with glibc, upgrade to a fixed glibc.
359 AC_CACHE_CHECK([for fseeko], ac_cv_func_fseeko,
360 [ac_cv_func_fseeko=no
361 AC_TRY_LINK([#include <stdio.h>],
362 [return fseeko && fseeko (stdin, 0, 0);],
363 [ac_cv_func_fseeko=yes])])
364 if test $ac_cv_func_fseeko != no; then
365 AC_DEFINE(HAVE_FSEEKO, 1,
366 [Define if fseeko (and presumably ftello) exists and is declared.])
369 undefine([AC_FUNC_MMAP])dnl
370 dnl The autoconf 2.13 version loses on OSF, at least,
371 dnl by messing up the declaration of malloc.
372 AC_DEFUN([AC_FUNC_MMAP],
373 [AC_CHECK_HEADERS(stdlib.h unistd.h sys/stat.h)
374 AC_CHECK_FUNCS(getpagesize)
375 AC_CACHE_CHECK(for working mmap, ac_cv_func_mmap_fixed_mapped,
377 [/* Thanks to Mike Haertel and Jim Avera for this test.
378 Here is a matrix of mmap possibilities:
379 mmap private not fixed
380 mmap private fixed at somewhere currently unmapped
381 mmap private fixed at somewhere already mapped
382 mmap shared not fixed
383 mmap shared fixed at somewhere currently unmapped
384 mmap shared fixed at somewhere already mapped
385 For private mappings, we should verify that changes cannot be read()
386 back from the file, nor mmap's back from the file at a different
387 address. (There have been systems where private was not correctly
388 implemented like the infamous i386 svr4.0, and systems where the
389 VM page cache was not coherent with the file system buffer cache
390 like early versions of FreeBSD and possibly contemporary NetBSD.)
391 For shared mappings, we should conversely verify that changes get
392 propogated back to all the places they're supposed to be.
394 Grep wants private fixed already mapped.
395 The main things grep needs to know about mmap are:
396 * does it exist and is it safe to write into the mmap'd area
397 * how to use it (BSD variants) */
398 #include <sys/types.h>
400 #include <sys/mman.h>
402 #if STDC_HEADERS || HAVE_STDLIB_H
411 # include <sys/stat.h>
414 /* This mess was copied from the GNU getpagesize.h. */
415 #if !HAVE_GETPAGESIZE
416 /* Assume that all systems that can run configure have sys/param.h. */
417 # if !HAVE_SYS_PARAM_H
418 # define HAVE_SYS_PARAM_H 1
422 # define getpagesize() sysconf(_SC_PAGESIZE)
423 # else /* no _SC_PAGESIZE */
424 # if HAVE_SYS_PARAM_H
425 # include <sys/param.h>
426 # ifdef EXEC_PAGESIZE
427 # define getpagesize() EXEC_PAGESIZE
428 # else /* no EXEC_PAGESIZE */
430 # define getpagesize() NBPG * CLSIZE
433 # endif /* no CLSIZE */
436 # define getpagesize() NBPC
439 # define getpagesize() PAGESIZE
440 # endif /* PAGESIZE */
441 # endif /* no NBPC */
442 # endif /* no NBPG */
443 # endif /* no EXEC_PAGESIZE */
444 # else /* no HAVE_SYS_PARAM_H */
445 # define getpagesize() 8192 /* punt totally */
446 # endif /* no HAVE_SYS_PARAM_H */
447 # endif /* no _SC_PAGESIZE */
449 #endif /* no HAVE_GETPAGESIZE */
454 char *data, *data2, *data3;
458 pagesize = getpagesize ();
460 /* First, make a file with some known garbage in it. */
461 data = (char *) malloc (pagesize);
464 for (i = 0; i < pagesize; ++i)
465 *(data + i) = rand ();
467 fd = creat ("conftestmmap", 0600);
470 if (write (fd, data, pagesize) != pagesize)
474 /* Next, try to mmap the file at a fixed address which already has
475 something else allocated at it. If we can, also make sure that
476 we see the same garbage. */
477 fd = open ("conftestmmap", O_RDWR);
480 data2 = (char *) malloc (2 * pagesize);
483 data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
484 if (data2 != mmap (data2, pagesize, PROT_READ | PROT_WRITE,
485 MAP_PRIVATE | MAP_FIXED, fd, 0L))
487 for (i = 0; i < pagesize; ++i)
488 if (*(data + i) != *(data2 + i))
491 /* Finally, make sure that changes to the mapped area do not
492 percolate back to the file as seen by read(). (This is a bug on
493 some variants of i386 svr4.0.) */
494 for (i = 0; i < pagesize; ++i)
495 *(data2 + i) = *(data2 + i) + 1;
496 data3 = (char *) malloc (pagesize);
499 if (read (fd, data3, pagesize) != pagesize)
501 for (i = 0; i < pagesize; ++i)
502 if (*(data + i) != *(data3 + i))
505 unlink ("conftestmmap");
507 }], ac_cv_func_mmap_fixed_mapped=yes, ac_cv_func_mmap_fixed_mapped=no,
508 ac_cv_func_mmap_fixed_mapped=no)])
509 if test $ac_cv_func_mmap_fixed_mapped = yes; then
510 AC_DEFINE(HAVE_MMAP, 1,
511 [Define if you have a working `mmap' system call.])