# serial 25 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2014 Free Software Foundation, dnl Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl From Jim Meyering. AC_DEFUN([gl_FUNC_MKTIME], [ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) dnl We don't use AC_FUNC_MKTIME any more, because it is no longer maintained dnl in Autoconf and because it invokes AC_LIBOBJ. AC_CHECK_HEADERS_ONCE([unistd.h]) AC_CHECK_DECLS_ONCE([alarm]) AC_REQUIRE([gl_MULTIARCH]) if test $APPLE_UNIVERSAL_BUILD = 1; then # A universal build on Apple Mac OS X platforms. # The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode. # But we need a configuration result that is valid in both modes. gl_cv_func_working_mktime=no fi AC_CACHE_CHECK([for working mktime], [gl_cv_func_working_mktime], [AC_RUN_IFELSE( [AC_LANG_SOURCE( [[/* Test program from Paul Eggert and Tony Leneis. */ #include #include #include #ifdef HAVE_UNISTD_H # include #endif #if HAVE_DECL_ALARM # include #endif /* Work around redefinition to rpl_putenv by other config tests. */ #undef putenv static time_t time_t_max; static time_t time_t_min; /* Values we'll use to set the TZ environment variable. */ static char *tz_strings[] = { (char *) 0, "TZ=GMT0", "TZ=JST-9", "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00" }; #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0])) /* Return 0 if mktime fails to convert a date in the spring-forward gap. Based on a problem report from Andreas Jaeger. */ static int spring_forward_gap () { /* glibc (up to about 1998-10-07) failed this test. */ struct tm tm; /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0" instead of "TZ=America/Vancouver" in order to detect the bug even on systems that don't support the Olson extension, or don't have the full zoneinfo tables installed. */ putenv ("TZ=PST8PDT,M4.1.0,M10.5.0"); tm.tm_year = 98; tm.tm_mon = 3; tm.tm_mday = 5; tm.tm_hour = 2; tm.tm_min = 0; tm.tm_sec = 0; tm.tm_isdst = -1; return mktime (&tm) != (time_t) -1; } static int mktime_test1 (time_t now) { struct tm *lt; return ! (lt = localtime (&now)) || mktime (lt) == now; } static int mktime_test (time_t now) { return (mktime_test1 (now) && mktime_test1 ((time_t) (time_t_max - now)) && mktime_test1 ((time_t) (time_t_min + now))); } static int irix_6_4_bug () { /* Based on code from Ariel Faigon. */ struct tm tm; tm.tm_year = 96; tm.tm_mon = 3; tm.tm_mday = 0; tm.tm_hour = 0; tm.tm_min = 0; tm.tm_sec = 0; tm.tm_isdst = -1; mktime (&tm); return tm.tm_mon == 2 && tm.tm_mday == 31; } static int bigtime_test (int j) { struct tm tm; time_t now; tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j; now = mktime (&tm); if (now != (time_t) -1) { struct tm *lt = localtime (&now); if (! (lt && lt->tm_year == tm.tm_year && lt->tm_mon == tm.tm_mon && lt->tm_mday == tm.tm_mday && lt->tm_hour == tm.tm_hour && lt->tm_min == tm.tm_min && lt->tm_sec == tm.tm_sec && lt->tm_yday == tm.tm_yday && lt->tm_wday == tm.tm_wday && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst) == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst)))) return 0; } return 1; } static int year_2050_test () { /* The correct answer for 2050-02-01 00:00:00 in Pacific time, ignoring leap seconds. */ unsigned long int answer = 2527315200UL; struct tm tm; time_t t; tm.tm_year = 2050 - 1900; tm.tm_mon = 2 - 1; tm.tm_mday = 1; tm.tm_hour = tm.tm_min = tm.tm_sec = 0; tm.tm_isdst = -1; /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0" instead of "TZ=America/Vancouver" in order to detect the bug even on systems that don't support the Olson extension, or don't have the full zoneinfo tables installed. */ putenv ("TZ=PST8PDT,M4.1.0,M10.5.0"); t = mktime (&tm); /* Check that the result is either a failure, or close enough to the correct answer that we can assume the discrepancy is due to leap seconds. */ return (t == (time_t) -1 || (0 < t && answer - 120 <= t && t <= answer + 120)); } int main () { int result = 0; time_t t, delta; int i, j; int time_t_signed_magnitude = (time_t) ~ (time_t) 0 < (time_t) -1; int time_t_signed = ! ((time_t) 0 < (time_t) -1); #if HAVE_DECL_ALARM /* This test makes some buggy mktime implementations loop. Give up after 60 seconds; a mktime slower than that isn't worth using anyway. */ signal (SIGALRM, SIG_DFL); alarm (60); #endif time_t_max = (! time_t_signed ? (time_t) -1 : ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1) * 2 + 1)); time_t_min = (! time_t_signed ? (time_t) 0 : time_t_signed_magnitude ? ~ (time_t) 0 : ~ time_t_max); delta = time_t_max / 997; /* a suitable prime number */ for (i = 0; i < N_STRINGS; i++) { if (tz_strings[i]) putenv (tz_strings[i]); for (t = 0; t <= time_t_max - delta && (result & 1) == 0; t += delta) if (! mktime_test (t)) result |= 1; if ((result & 2) == 0 && ! (mktime_test ((time_t) 1) && mktime_test ((time_t) (60 * 60)) && mktime_test ((time_t) (60 * 60 * 24)))) result |= 2; for (j = 1; (result & 4) == 0; j <<= 1) { if (! bigtime_test (j)) result |= 4; if (INT_MAX / 2 < j) break; } if ((result & 8) == 0 && ! bigtime_test (INT_MAX)) result |= 8; } if (! irix_6_4_bug ()) result |= 16; if (! spring_forward_gap ()) result |= 32; if (! year_2050_test ()) result |= 64; return result; }]])], [gl_cv_func_working_mktime=yes], [gl_cv_func_working_mktime=no], [gl_cv_func_working_mktime=no]) ]) if test $gl_cv_func_working_mktime = no; then REPLACE_MKTIME=1 else REPLACE_MKTIME=0 fi ]) AC_DEFUN([gl_FUNC_MKTIME_INTERNAL], [ AC_REQUIRE([gl_FUNC_MKTIME]) if test $REPLACE_MKTIME = 0; then dnl BeOS has __mktime_internal in libc, but other platforms don't. AC_CHECK_FUNC([__mktime_internal], [AC_DEFINE([mktime_internal], [__mktime_internal], [Define to the real name of the mktime_internal function.]) ], [dnl mktime works but it doesn't export __mktime_internal, dnl so we need to substitute our own mktime implementation. REPLACE_MKTIME=1 ]) fi ]) # Prerequisites of lib/mktime.c. AC_DEFUN([gl_PREREQ_MKTIME], [:])