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| author | Andy Wingo <wingo@pobox.com> | 2021-01-20 21:52:54 +0100 |
|---|---|---|
| committer | Andy Wingo <wingo@pobox.com> | 2021-01-20 23:03:56 +0100 |
| commit | a91b95cca2d397c84f8b9bbd602d40209a7092ce (patch) | |
| tree | 2c286a291f5a2b812d6e216be10936f2709d59cf /m4/time_rz.m4 | |
| parent | 758b31994cff582c7e8785b4cc2240dbf3573837 (diff) | |
| download | guile-a91b95cca2d397c84f8b9bbd602d40209a7092ce.tar.gz | |
Update Gnulib to v0.1-4379-g2ef5a9b4b
Also bump required autoconf version to 2.64, as required by Gnulib.
Diffstat (limited to 'm4/time_rz.m4')
| -rw-r--r-- | m4/time_rz.m4 | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/m4/time_rz.m4 b/m4/time_rz.m4 index 79060e00f..34ef0bab4 100644 --- a/m4/time_rz.m4 +++ b/m4/time_rz.m4 @@ -1,6 +1,6 @@ dnl Time zone functions: tzalloc, localtime_rz, etc. -dnl Copyright (C) 2015-2017 Free Software Foundation, Inc. +dnl Copyright (C) 2015-2021 Free Software Foundation, 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. @@ -10,9 +10,41 @@ dnl Written by Paul Eggert. AC_DEFUN([gl_TIME_RZ], [ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) - AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS]) + AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) AC_REQUIRE([AC_STRUCT_TIMEZONE]) - AC_CHECK_FUNCS_ONCE([tzset]) + + # On Mac OS X 10.6, localtime loops forever with some time_t values. + # See Bug#27706, Bug#27736, and + # https://lists.gnu.org/r/bug-gnulib/2017-07/msg00142.html + AC_CACHE_CHECK([whether localtime works even near extrema], + [gl_cv_func_localtime_works], + [gl_cv_func_localtime_works=yes + AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdlib.h> + #include <string.h> + #include <unistd.h> + #include <time.h> + ]], [[ + time_t t = -67768038400666600; + struct tm *tm; + char *tz = getenv ("TZ"); + if (! (tz && strcmp (tz, "QQQ0") == 0)) + return 0; + alarm (2); + tm = localtime (&t); + /* Use TM and *TM to suppress over-optimization. */ + return tm && tm->tm_isdst; + ]])], + [(TZ=QQQ0 ./conftest$EXEEXT) >/dev/null 2>&1 || + gl_cv_func_localtime_works=no], + [], + [gl_cv_func_localtime_works="guessing yes"])]) + if test "$gl_cv_func_localtime_works" = no; then + AC_DEFINE([HAVE_LOCALTIME_INFLOOP_BUG], 1, + [Define if localtime-like functions can loop forever on + extreme arguments.]) + fi AC_CHECK_TYPES([timezone_t], [], [], [[#include <time.h>]]) if test "$ac_cv_type_timezone_t" = yes; then |