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,
304 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES
309 [AC_TRY_COMPILE([#define $1 $2]
310 AC_SYS_LARGEFILE_TEST_INCLUDES
315 if test "[$]$3" != no; then
316 AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
319 AC_DEFUN(AC_SYS_LARGEFILE,
320 [AC_ARG_ENABLE(largefile,
321 [ --disable-largefile omit support for large files])
322 if test "$enable_largefile" != no; then
324 AC_CACHE_CHECK([for special C compiler options needed for large files],
325 ac_cv_sys_largefile_CC,
326 [ac_cv_sys_largefile_CC=no
327 if test "$GCC" != yes; then
328 # IRIX 6.2 and later do not support large files by default,
329 # so use the C compiler's -n32 option if that helps.
330 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
333 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
334 ac_cv_sys_largefile_CC=' -n32')
337 if test "$ac_cv_sys_largefile_CC" != no; then
338 CC="$CC$ac_cv_sys_largefile_CC"
341 AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
342 ac_cv_sys_file_offset_bits,
343 [Number of bits in a file offset, on hosts where this is settable.])
344 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
345 ac_cv_sys_largefile_source,
346 [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],
347 [#include <stdio.h>], [return !ftello;])
348 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
349 ac_cv_sys_large_files,
350 [Define for large files, on AIX-style hosts.])
351 AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,
352 ac_cv_sys_xopen_source,
353 [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],
354 [#include <stdio.h>], [return !ftello;])